低氢脆性镉钛合金电镀LOW HYDROGEN EMBRITTLEMENT CADMIUM – TITANIUM ALLOY PLATING
1. INTRODUCTION 介绍
NOTE: This low hydrogen embrittlement cadmium-titanium alloy plating is an optional and preferred procedure to the low hydrogen embrittlement cadmium plating procedure in SOPM 20-42-01. But if the overhaul instructions specify low hydrogen embrittlement cadmium-titanium plating and you cannot do it, you can always use low hydrogen embrittlement cadmium plating per SOPM 20-42-01 as an alternative. Stylus cadmium plating per SOPM 20-42-10 is optional for local areas not larger than 72 square inches on components with no load applied during the plating procedure.
注： 这种低氢脆镉钛合金电镀是 SOPM 20-42-01 中的低氢脆镉电镀程序的可选和首选程序。但是，如果大修说明规定的是低氢脆镉钛合金电镀，而你又做不到，你可以随时使用 SOPM 20-42-01 的低氢脆镉电镀作为替代。根据 SOPM 20-42-10 标准进行的触针镉电镀是可选的，用于在电镀程序中不施加负载的部件上不大于 72 平方英寸的局部区域。
A. The data in this subject comes from Boeing Process Specification BAC5804 for low hydrogen embrittlement cadmium-titanium alloy plating.
本主题中的数据来自波音公司低氢脆镉钛合金电镀工艺规范 BAC5804。
B. The data is general. It is not about all situations or specific installations. Use this data to help you write minimum standards.
数据是通用的。并非针对所有情况或特定安装。使用此数据可帮助您制定最低标准。
C. This plating is usually used on low alloy, high-strength steels, such as those heat-treated above 220 ksi. The plating makes a corrosion resistant layer that lets hydrogen ions come through from the metal when the part is subsequently baked.
这种镀层通常用于低合金高强度钢，如热处理超过 220 ksi 的钢。电镀层会形成一层耐腐蚀层，在随后对零件进行烘烤时，会让氢离子从金属中穿透出来。
D. Refer to SOPM 20-00-00 for a list of all the vendor names and addresses.
有关所有供应商的名称和地址，请参阅 SOPM 20-00-00。
2. MATERIALS 材料
A. Sodium Cyanide, 97% NaCN minimum — Cyanogran M or Cyanobrick, V18873
氰化钠，最低含量为 97% NaCN — Cyanogran M 或 Cyanobrick, V18873
B. Anodes, Cadmium — A-A-51126
阳极，镉 — A-A-51126
C. Cadmium Oxide — A-A-50800
氧化镉 — A-A-50800
D. Sodium Hydroxide, Technical — O-S-598 or 48% solution
工业氢氧化钠 — O-S-598 或 48% 溶液
E. Sodium Dichromate Dihydrate, Technical — O-S-595
二水重铬酸钠，工业品 — O-S-595
F. Sulfuric Acid, 66° Baume, Technical — O-S-809, Type 1
硫酸，66° Baume，工业级 — O-S-809，1 型
G. Wetting Agent — Nacconol 90G, V87570 (Replaces Nacconol 90F)
润湿剂 — Nacconol 90G，V87570（替代 Nacconol 90F） H. 油漆 — O-S-598 或 V87570 溶液
H. Titanium Paste — must be homogeneous and free of lumps, must contain a minimum of 1.9% titanium by weight, and contain no more than 10 ppm chloroform extractable materials.
钛膏 — 必须均匀且无结块，必须含有至少 1.9%（按重量计）的钛，且含有不超过 10 ppm 的氯仿萃取物。
(1) Olympic Titanium Paste, V0T9R1
奥林匹克钛浆，V0T9R1
(2) Ti-plate 504, V06186
钛板 504，V06186
(3) Titan Paste Type J, VS4143 or VS4404
J 型钛浆，VS4143 或 VS4404。
I. Hydrogen Peroxide 35%, Technical Grade
35% 过氧化氢，工业级
J. Filter Aid, Celite 501, V9K562. Equivalent filter aids include those prepared from diatomaceous earths. Organic-based aids, such as those prepared from cellulose, are not acceptable.
助滤剂，Celite 501，V9K562。同等的助滤剂包括用硅藻土制备的助滤剂。不接受有机基助滤剂，如用纤维素制备的助滤剂。
K. Primer — BMS 10-11, Type 1
底漆 — BMS 10-11，1 类
L. Hydrochloric Acid, 20° Baume, Technical — O-H-765
盐酸，20° Baume，工业级 — O-H-765
M. Chromic Acid, Technical — O-C-303
铬酸，工业级 — O-C-303
N. Fluoboric Acid, 48%, Technical
氟硼酸，48%，工业级
O. Carbonate Remover, ARP 210, V99442
碳酸盐去除剂，ARP 210，V99442
P. Ultrachromate 300 Concentrate, V64709 or V0T9R1
超铬酸盐 300 浓缩液，V64709 或 V0T9R1
Q. Nitric Acid, 40° or 42° Baume, Technical — O-N-350
硝酸，40° 或 42° Baume，工业级 — O-N-350
3. TANK AND SOLUTION PREPARATION 槽和溶液制备
A. General
通用
(1) This process uses a continuously filtered bath. The filter must be of a type that puts soluble titanium into the plating bath.
该工艺使用连续过滤的镀液。过滤器的类型必须能将可溶性钛放入电镀液中。
(2) The filter must have sufficient free volume to contain all filter aid, titanium paste, and titanium in the bath, if all of these materials accidentally come out of solution.
过滤器必须有足够的自由容积，以便在助滤剂、钛糊和钛全部从溶液中溢出的情况下，仍能容纳所有这些物质。
(3) The filter rate must be a minimum of 2 tank volumes per hour. We recommend a maximum rate of 4 tank volumes per hour, and a filter cloth area of 6 square feet per 100 gallons of solution.
过滤速度必须至少为每小时 2 槽体积。我们建议最高过滤速度为每小时 4 槽，每 100 加仑溶液的滤布面积为 6 平方英尺。
(4) The system can include a permanently installed carbon filter, if the flow rate is not more than 2% of tank volume per hour. The carbon filter can be used on a continuous or intermittent basis.
如果流速不超过每小时水箱容积的 2%，系统可包括一个永久安装的碳过滤器。碳过滤器可连续或间歇使用。
(5) All surfaces of the tank, filter, and related plumbing which continuously touch the plating solution must be made of, lined, or coated with one of the following materials. When the tank is not used, put a cover on it which is made of, or coated with, one of these materials.
槽体、过滤器和相关管道的所有连续接触镀液的表面必须由以下材料制成、内衬或涂覆。不使用水槽时，应在其上加盖一个由这些材料之一制成或涂有这些材料之一的盖子。
(a) 300 series CRES
300 系列 CRES
(b) Titanium or titanium alloy
钛或钛合金
(c) Epoxy primer
环氧底漆
(d) Rigid polyvinyl chloride or polyvinyl dichloride
硬聚氯乙烯或聚二氯乙烯
(e) Polytetrafluoroethylene
聚四氟乙烯
(f) Unfilled polyethylene or polypropylene
无填充聚乙烯或聚丙烯
(g) Mylar
聚酯薄膜
(h) Paraline AR, V70849
(i) Hypalon 70-H3, V06470
(j) Goodyear LS576 neoprene
(6) A lining or coating of a nonconducting material is recommended on the tank interior so the tank does not become bipolar.
建议在槽体内部使用非导电材料的内衬或涂层，以免槽体变成双极。
B. Precondition Tank
预处理槽
CAUTION :DO NOT LET ORGANIC MATERIALS GET INTO THE TANK, PLUMBING, OR PLATING SOLUTION, BECAUSE ORGANIC MATERIALS WILL DECREASE OR REMOVE THE LOW HYDROGEN EMBRITTLEMENT PROPERTIES OF THE PLATED PARTS.
注意 :不要让有机物进入镀槽、管道或镀液，因为有机物会降低或消除镀件的低氢脆性能。
(1) Fill the tank with caustic cyanide holding solution (Table 1).
在镀槽中注入苛性氰化物保温溶液（表 1）。
(2) Let this stand for one week. Operate the pump and filter system a minimum of 8 hours per day.
静置一周。泵和过滤系统每天至少运行 8 小时。
(3) Remove and discard this cyanide holding solution. Do not use this removed solution for the holding bath of Table 1.
取出并丢弃氰化物保温溶液。切勿将此溶液用于表 1 的保温槽。
(4) Rinse out the tank completely before you fill it with the plating solution.
在注入电镀液之前，将槽完全冲洗干净。
C. Prepare Plating Solution
准备电镀液
(1) Fill the tank approximately half full with water which has an electrical resistivity of not less than 50,000 ohm-cm. This is equivalent to approximately 10 ppm dissolved ionic solids.
将电阻率不小于 50,000 欧姆-厘米的水注入镀槽大约一半。这相当于大约 10 ppm 的溶解离子固体。
WARNING :DO NOT BREATHE THESE SOLIDS OR LET THEM TOUCH THE SKIN.
警告 :不要吸入这些固体或让其接触皮肤。
(2) For each 100 gallons of final solution, add 100 pounds of sodium cyanide followed by 22 pounds of cadmium oxide.
每 100 加仑最终溶液加入 100 磅氰化钠，再加入 22 磅氧化镉。
(3) Mix thoroughly until all components are dissolved. Fill the tank with remaining water per Paragraph 3.C.(1).
充分搅拌，直至所有成分溶解。根据第 3.C.(1)段的规定，将剩余的水注入储槽。
(4) Stir to fully mix the solution. Then electrolyze the solution with some of the anodes used as cathodes, until you get a satisfactory quality of plating.
搅拌使溶液充分混合。然后用一些用作阴极的阳极来点解溶液，直到获得满意的电镀质量。
(5) After the new bath is correctly aged, add titanium to the bath as follows:
待新镀液完全老化后，按以下步骤加入钛：
(a) Coat the filter cloth with filter aid.
在滤布上涂上助滤剂。
(b) For each gallon of slurry, use one pound filter aid, three pounds titanium paste, 2.5 oz. sodium hydroxide, and water to make a gallon. Use one gallon of slurry for each 100 gallons of plating solution. These amounts can be adjusted for best results.
每加仑浆液使用一磅助滤剂、三磅钛浆、2.5 盎司氢氧化钠和水。每 100 加仑电镀液使用一加仑浆料。这些用量可根据最佳效果进行调整。
NOTE: Ti-plate 504 is a supplied as a slurry. If you use this product, add it to the system directly, without the sodium hydroxide or water.
注：Ti-plate 504 以浆料形式供应。如果使用该产品，请直接将其添加到系统中，而不要添加氢氧化钠或水。
(c) Add the slurry into the filter through a slurry tank or directly into the plating tank.
通过浆料槽将浆料加入过滤器或直接加入电镀槽。
(d) Add 5 fluid ounces of 35% hydrogen peroxide directly to the tank for each 100 gallons of solution.
每 100 加仑溶液直接加入 5 液盎司 35% 过氧化氢。
(e) After 30 minutes, analyze the plating solution for titanium content. Adjust the titanium to 55-97 parts per million (ppm) titanium. To increase titanium, add more hydrogen peroxide. The titanium content will automatically decrease as the peroxide complex breaks down with time.
30 分钟后，分析镀液中的钛含量。将钛含量调整到百万分之 55-97 (ppm)。要增加钛含量，可添加更多的过氧化氢。随着时间的推移，过氧化物复合物分解，钛含量会自动降低。
D. Maintenance of Cadmium-Titanium Plating Bath
镉钛电镀液的维护
CAUTION :KEEP ORGANIC MATERIALS OUT OF THE PLATING BATH, BECAUSE THEY WILL DECREASE OR REMOVE THE LOW HYDROGEN EMBRITTLEMENT PROPERTIES.
注意 :不要让有机物进入镀液，因为它们会降低或消除低氢脆特性。
(1) Control the plating solution within these limits and adjust it when necessary.
将镀液控制在上述范围内，必要时进行调整
(a) Cadmium metal — 2.8-3.5 oz/gal (21-26 g/liter)
金属镉 — 2.8-3.5 盎司/加仑（21-26 克/升）
(b) Total cyanide (as NaCN) — 13-17 oz/gal (97-128 g/liter)
总氰化物（如 NaCN）- 13-17 盎司/加仑（97-128 克/升）
(c) Sodium hydroxide — 2.0-2.5 oz/gal (15-19 g/liter)
氢氧化钠 — 2.0-2.5 盎司/加仑（15-19 克/升）
(d) Sodium carbonate — 8.0 oz/gal maximum (60 g/liter max.)
碳酸钠 — 最多 8.0 盎司/加仑（最多 60 克/升）
(e) Total iron contamination — 300 ppm maximum
总铁污染 — 最多 300 ppm
(f) Titanium — 55-97 ppm
钛 — 55-97 ppm
(g) Total cyanide to cadmium ratio (NaCN/Cd), 4:1-5:1
总氰化物与镉之比（NaCN/Cd），4:1-5:1
(h) Operation temperature — 60-85°F (15-30°C)
操作温度 – 60-85°F (15-30°C)
NOTE: Cool or heat as necessary. A heat exchanger in the filter return line is recommended.
注：根据需要进行冷却或加热。建议在过滤器回流管路中安装热交换器。
(2) Analyze the bath for titanium content and adjust as necessary to control the concentration. Also, analyze the bath for titanium and adjust as necessary before you put the bath back in operation after a shutdown. To increase titanium content, add 35% hydrogen peroxide directly to the bath. We recommend approximately 4-6 fluid ounces of 35% hydrogen peroxide per 100 gallons of solution, added daily.
分析浴液中的钛含量，并根据需要进行调整，以控制浓度。此外，在停机后重新投入运行前，应分析浴槽中的钛含量并根据需要进行调整。要增加钛含量，可直接在浴槽中加入 35% 的过氧化氢。我们建议每 100 加仑溶液中每天添加约 4-6 液盎司 35% 过氧化氢。
(3) When additions of hydrogen peroxide do not increase the titanium content, and there are no malfunctions in the filter system, add more titanium paste to the filter per Paragraph 3.C.(5) above. One pound of titanium paste will give the titanium to plate approximately 30 pounds of cadmium, or approximately 6500 amp-hours of plating time.
如果添加过氧化氢不能增加钛的含量，且过滤系统无故障，则根据上述第 3.C.(5)段向过滤器添加更多的钛浆。一磅钛浆可提供约 30 磅镉的电镀钛，或约 6500 安培小时的电镀时间。
(4) Remove unwanted sodium carbonate, as necessary. Carbonate remover ARP 210, used correctly, will not decrease the hydrogen embrittlement properties of the bath. But you must do a test for hydrogen embrittlement after this treatment.
必要时去除不需要的碳酸钠。正确使用碳酸盐去除剂 ARP 210 不会降低镀液的氢脆特性。但处理后必须进行氢脆测试。
4. ANODES 阳极
NOTE: 300 series CRES anodes completely plated with cadmium, with no copper or nickel strike, are equivalent to cadmium anodes. Anodes must stay completely coated with cadmium after plating of parts.
注：300 系列 CRES 阳极完全镀镉，无铜或镍镀层，等同于镉阳极。阳极必须在零件电镀后完全镀上镉。
A. Use solid cadmium anodes or cadmium ball anodes in titanium anode holders.
在钛阳极座中使用固体镉阳极或镉球阳极。
B. Do not let anode hooks, jigs, or racks touch plating solutions if they are made of materials not approved for the tank in Paragraph 3.
如阳极钩、夹具或架子是由第 3 段中未批准用于镀槽的材料制成，则不得让其接触镀液。
C. Use auxiliary (internal) anodes (300-series CRES or cadmium) to get the specified plating thickness where the ratio of hole depth of inside diameter is more than 1:1 for open holes, or more than 0.5:1 for blind holes. You can control current to the internal steel anodes independently from the current to the tank and the external anodes to be sure the current density is correct on the inside diameters.
使用辅助（内部）阳极（300 系列 CRES 或镉）以获得规定的镀层厚度，如果孔深与内径之比大于 1:1（开孔），或大于 0.5:1（盲孔）。您可以控制内部钢阳极的电流，使其独立于槽和外部阳极的电流，以确保内径上的电流密度正确无误。
5. PREPLATE TREATMENT 镀前处理
A. Complete all machining, forming, welding, or brazing before plating.
电镀前完成所有机加工、成型、焊接或钎焊。
B. Before you start to plate them, stress relieve low alloy and corrosion resistant steel parts by the overhaul instructions. Where no stress relief details are given, stress relieve per SOPM 20-10-02.
在开始电镀之前，按大修说明对低合金钢和耐腐蚀钢零件进行应力消除。如果没有提供应力释放细节，则按照 SOPM 20-10-02 进行应力释放。
C. Manual solvent clean as necessary, and then vapor degrease per SOPM 20-30-03. Make sure the parts are fully dry.
必要时进行手工溶剂清洗，然后按照 SOPM 20-30-03 进行蒸汽脱脂。确保零件完全干燥。
D. Mask the areas of parts not to be plated. This includes surfaces which have plasma flame spray coating.
屏蔽零件上不需要电镀的区域。这包括已进行等离子火焰喷涂的表面。
E. Dry abrasive blast per SOPM 20-30-03. A rougher particle size, such as 80 grit aluminum oxide, will help the plating bond and the low hydrogen embrittlement property.
按照 SOPM 20-30-03 进行干式喷砂。粒度较粗的颗粒，如 80 粗细度的氧化铝，将有助于电镀结合和低氢脆特性。
F. If you must stop, the parts must show no rust, dirt, or bad color change after you use one of these alternatives:
如果必须停止，则在使用这些替代方法之一后，零件必须没有生锈、污垢或严重的颜色变化：
(1) You can keep parts for one hour maximum at ambient temperature with no special protection.
在没有特殊保护的情况下，可以将零件在环境温度下最多放置一小时。
(2) You can keep parts for 6 hours maximum at ambient temperature if you keep them in a clean area and give them protection from dust and fumes.
如果将零件放在干净的地方，并防止灰尘和烟雾进入，则在环境温度下最多可保存 6 小时。
(3) Within one hour, you can put the parts in a cyanide holding bath (Table 1). Keep the parts in this bath no longer than 4 hours.
1 小时内，可将零件放入氰化物保温槽（表 1）中。将零件放在氰化物槽中的时间不得超过 4 小时。
G. Cold water rinse at 100°F max. for 0.5-5.0 minutes.
用最高温度为 100°F 的冷水冲洗 0.5-5.0 分钟。
H. Activate the surfaces of the part to be plated by immersion in acid solution for 5-30 seconds. Remove the part immediately when gas occurs.
将待镀零件表面浸入酸溶液中 5-30 秒钟。出现气体时立即取出零件。
(1) Fluoboric acid solution (recommended): 2.5 volume parts fluoboric acid to 100 parts water. Control 1.25-2.50 oz/gal and 60-95°F.
氟硼酸溶液（推荐）： 2.5 体积份的氟硼酸对 100 体积份的水。控制在 1.25-2.50 盎司/加仑和 60-95 华氏度。
(2) Hydrochloric acid solution (alternate): 3 volume parts hydrochloric acid to 100 parts water. Control at 0.82-1.64 oz/gal and 60-95°F.
盐酸溶液（备用）： 3 体积份数的盐酸兑 100 体积份数的水。控制温度为 0.82-1.64 盎司/加仑和 60-95°F。
I. Within 2 minutes, cold water rinse for minimum of 20 seconds and maximum of 6 minutes. Then start to plate within 2 minutes.
2 分钟内，用冷水冲洗最少 20 秒，最多 6 分钟。然后在 2 分钟内开始装盘。
6. PLATING PROCEDURE 电镀程序
A. When the plating bath is first started, or after it was not used for a time, we recommend you plate samples and make adjustments before you plate parts.
刚开始使用电镀槽时，或电镀槽有一段时间未使用后，建议您先进行样品电镀，调整后再进行零件电镀。
B. Apply initial strike per Table 2.
按表 2 进行初始电镀。
C. Decrease the current and plate to the specified thickness at 20-35 ASF per Table 3. Do not use a current density below 20 ASF, because low current density plating will decrease the low hydrogen embrittlement property of the deposit. You can temporarily stop the plating cycle to move parts in the racks to get 100% coverage.
根据表 3，在 20-35 ASF 下降低电流并电镀至规定的厚度。不要使用低于 20 ASF 的电流密度，因为低电流密度电镀会降低镀层的低氢脆特性。可以暂时停止电镀循环，在机架上移动零件，以获得 100% 的覆盖率。
(1) For the first part plated with a given set up, you can stop plating and remove the part from the bath for thickness and coverage checks. When anode configuration, plating time and voltage adjustments are satisfactory, plate all parts of the same configuration as a continuous operation. Parts used to adjust plating conditions must be stripped and plated again.
对于使用给定设置电镀的第一个零件，可以停止电镀并将零件从电镀槽中取出，进行厚度和覆盖率检查。当阳极配置、电镀时间和电压调整都令人满意时，可连续电镀所有配置相同的零件。用于调整电镀条件的零件必须重新剥离和电镀。
(2) Do not mechanically remove material from, polish, or brush the plated areas.
不得以机械方式清除、抛光或刷洗电镀区域的材料。
D. Cold water rinse (100°F max) for approximately 1-10 minutes.
冷水冲洗（最高 100°F）约 1-10 分钟。
NOTE: Control the overflow rate on all immersion rinse tanks to keep the dissolved solids below 1000 ppm at the rinse water outlet, measured at the time parts are removed from the tank.
注：控制所有浸入式冲洗槽的溢流率，使冲洗水出口处的溶解固体含量低于 1000 ppm（从槽中取出零件时测量）。
E. As an option, and to remove light powder films (but not on parts to get a BAC5810 phosphate treatment):
作为一种选择，可去除轻质粉末膜（但不包括要进行 BAC5810 磷酸盐处理的零件）：
(1) Rinse parts in chromic acid-water solution for 0.5-2 minutes at ambient temperature. To prepare this solution, mix 34 pounds of chromic acid with 100 gallons of water. Control at 4.1-6.9 oz/gal.
在环境温度下，将零件放入铬酸水溶液中冲洗 0.5-2 分钟。制备此溶液时，将 34 磅铬酸与 100 加仑水混合。控制在 4.1-6.9 盎司/加仑。
(2) Cold water rinse (100°F max.) 0.5-5 minutes.
冷水冲洗（最高 100°F）0.5-5 分钟。
F. Dry within 5 minutes. A one-minute-maximum hot rinse (130°F maximum) can be used to help dry the parts, but do not use this as the regular rinse after plating.
在 5 分钟内烘干。可使用最多一分钟的热冲洗（最高 130°F）来帮助擦干零件，但不要将其作为电镀后的常规冲洗。
G. Remove masking materials.
去除遮蔽材料。
H. Low hydrogen embrittlement stylus cadmium plate per SOPM 20-42-10 all rack marks, contact areas, or surfaces which could not be plated by rack or anode design.
按照 SOPM 20-42-10 标准对所有挂镀标记、接触区域或无法通过挂镀或阳极设计进行电镀的表面进行低氢脆触针镉电镀。
7. POST-PLATE TREATMENT 镀后处理
A. Hydrogen Embrittlement Relief Bake
氢脆消除烘烤
(1) Bake steel parts within 8 hours of plating as specified in Table 4, unless specified by the overhaul instructions. The bake is not necessary for corrosion resistant steels A-286, and 300 series.
除非大修说明有规定，否则应在镀层后 8 小时内按照表 4 的规定对钢零件进行烘烤。耐腐蚀钢 A-286 和 300 系列不需要烘烤。
(2) If parts are to get phosphate treatment or dry film lubricant, the bakes of those procedures can be combined with this bake if you start the bake within 8 hours after plating, and bake per Paragraph 7.A.(1) above.
如果要对零件进行磷化处理或干膜润滑，可将这些程序的烘烤与此烘烤结合起来，但必须在电镀后 8 小时内开始烘烤，并按照上述第 7.A.(1)段进行烘烤。
NOTE: If the overhaul instructions specify chromate treatment, and Ultrachromate 300 will be used, you can chromate treat before the hydrogen embrittlement bake as an option. But the resistance to corrosion will be better if you bake first, and then do the chromate treatment.
注： 如果大修说明规定的是铬酸盐处理，并且将使用 Ultrachromate 300，则可在氢脆烘烤之前进行铬酸盐处理。但如果先进行烘烤，然后再进行铬酸盐处理，耐腐蚀性会更好。
B. Magnetic particle examine (SOPM 20-20-01) if specified by the overhaul instructions. Then alkaline solvent or manually clean the parts per SOPM 20-30-03.
如果大修说明有规定的，进行磁粉检查（SOPM 20-20-01）。然后按照 SOPM 20-30-03 用碱性溶剂或手工清洗零件。
C. When the overhaul instructions specify chromate treatment:
当大修说明规定的铬酸盐处理时：
(1) Put the parts in one of the chromate solutions (Table 5).
将零件放入其中一种铬酸盐溶液中（表 5）。
(a) Ultrachromate 300 (normal) for 15-30 seconds, or
超铬酸盐 300（普通）15-30 秒，或
(b) Ultrachromate 300 (dilute) for 30-90 seconds, or
超铬酸盐 300（稀释）30-90 秒，或
(c) Cronak for 5-10 seconds, or
Cronak 5-10 秒，或
(d) Any other chromate solution per QQ-P-416, Type II.
符合 QQ-P-416，类型 II 的任何其他铬酸盐溶液。
(2) Rinse for 0.5-2 minutes. Hot water at 160°F maximum can be used to help the parts dry. Do not use this rinse water for the usual rinse after the plating.
冲洗 0.5-2 分钟。可使用最高温度为 160°F 的热水帮助零件干燥。不要将此冲洗水用于电镀后的常规冲洗。
(3) Within 5 minutes, dry at a temperature no hotter than 160°F.
5 分钟内，在不高于 160°F 的温度下烘干。
D. When the overhaul instructions specify phosphate treatment, apply the phosphate and bake per BAC5810, Type III. This phosphate treatment can be done before or after the hydrogen embrittlement relief bake of Paragraph 7.A. above. But, if you phosphate treat after that bake, bake the parts again as specified in BAC5810, Type III.
当大修说明规定的磷酸盐处理时，按照 BAC5810 III 型进行磷酸盐处理和烘烤。磷化处理可在上述第 7.A. 段的氢脆消除烘烤之前或之后进行。但是，如果在烘烤之后进行磷化处理，则应按照 BAC5810 类型 III 的规定再次烘烤零件。
8. QUALITY CONTROL 质量控制
A. Appearance
外观
(1) When examined without magnification, the deposit must be dull, continuous, smooth, fine grained, tightly bonded, and have no blisters, pits, nodules, flakes, or burns. A frosty property is acceptable and recommended.
在不使用放大镜的情况下进行检查时，沉积物必须无光泽、连续、光滑、纹理细密、结合紧密，且无水泡、凹坑、结节、薄片或烧伤。可接受并建议使用霜状特性。
(2) If applicable, the chromate treatment coatings must be tightly bonded and have no powder.
如适用，铬酸盐处理涂层必须紧密结合，无粉末。
B. Plating Thickness
镀层厚度
(1) Measure the thickness with a procedure that has a precision equal to or better than +/-10 percent of the thickness to be measured.
使用精度等于或优于待测厚度 +/-10% 的程序测量厚度。
(2) Measure the thickness on the plating after the bakes and chromate or phosphate treatments are completed.
在完成烘烤和铬酸盐或磷酸盐处理后测量镀层厚度。
(3) When not specified by overhaul instructions, use a minimum thickness of 0.0005 inch and a maximum of 0.0008 inch. Thickness greater than 0.0008 inch is permitted in areas where the cathode current density is usually high, such as corners and edges.
如果大修说明没有规定的，使用最小厚度 0.0005 英寸，最大 0.0008 英寸。在阴极电流密度通常较高的区域，如角落和边缘，厚度允许大于 0.0008 英寸。
(4) Unless specified by overhaul instructions, the thickness requirements apply only to visible surfaces that can be touched by a 0.75 inch diameter ball. But all visible surfaces must be completely covered by the plating.
除非大修说明有规定的，否则厚度要求只适用于 0.75 英寸直径的球可以接触到的可见表面。但镀层必须完全覆盖所有可见表面。
C. Titanium Content
钛含量
(1) If you add hydrogen peroxide manually, do tests of the bath for titanium a minimum of one time each 8 hours of operation.
如果手动添加过氧化氢，则每运行 8 小时至少检测一次槽液中的钛含量。
(2) If you add hydrogen peroxide continuously and automatically, do tests of the bath for titanium a minimum of one time each day. You can use a longer interval if your experience with the procedure makes you sure the titanium content stays within the specified limits.
如果连续自动添加过氧化氢，则每天至少检测一次浴槽中的钛含量。如果根据您的程序经验，钛含量不会超出规定的限度，则可延长间隔时间。
D. For hydrogen embrittlement control, do tests on the plating solution with a hydrogen detection instrument. Make these tests at least twice a week, on the day of plating if more than 3 days after the last hydrogen test, after each time the filter is recharged, and after each carbonate treatment. Refer to BAC5804 and BSS7321 for details.
为控制氢脆，使用氢检测仪器对镀液进行测试。每周至少检测两次，如果上次氢检测后超过 3 天，则在电镀当天、每次过滤器充水后以及每次碳酸盐处理后进行。详情请参阅 BAC5804 和 BSS7321。
E. Adhesion
附着力
(1) As a check on the procedure, do tests on specimens or parts per BAC5804 and BSS7235.
作为对程序的检查，按照 BAC5804 和 BSS7235 对试样或零件进行测试。
(2) As a check on parts you plated, do a tape test per BSS7225, Type 1, class 1 (dry test, no scribe). Visually examine all surfaces for blisters or flakes.
作为电镀零件的检查，按照 BSS7225，类型 1，等级 1（干测试，无划线）进行胶带测试。目视检查所有表面是否有起泡或剥落。
F. Corrosion Resistance — Do a salt spray test on plated parts or specimens. Refer to BAC5746 for details.
耐腐蚀性 — 对电镀零件或试样进行盐雾测试。详情请参阅 BAC5746。
G. Do tests on samples at regular intervals to be sure of the plating quality. If the interval is not specified by this procedure or in BAC5804, use an interval that agrees with standard industry practices, your experience with the procedure, and to make sure you can find parts that could have bad plating. If BAC5804 gives a formula to calculate the interval, use it for your basic quality control plan.
定期对样品进行测试，以确保电镀质量。如果本程序或 BAC5804 没有规定的间隔时间，请使用符合标准行业惯例、您的程序经验的间隔时间，并确保您能找到可能存在不良镀层的零件。如果 BAC5804 提供了计算间隔时间的公式，请将其用于基本质量控制计划。