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镀层标记代号a （B类b） | 公称镀层 厚度/μm | 铬酸盐 处理标记c | 第1次出现白色腐蚀物时间/h | 第1次出现红色铁锈时间/h | |
镉镀层 | 锌镀层 | ||||
Fe/Zn或Fe/Cd3c1A | 3d | A | 2 | 24 | 12 |
Fe/Zn或Fe/Cd3c1B | B | 6 | 24 | 12 | |
Fe/Zn或Fe/Cd3c2C | C | 24 | 36 | 24 | |
Fe/Zn或Fe/Cd3c2D | D | 24 | 36 | 24 | |
Fe/Zn或Fe/Cd5c1A | 5 | A | 6 | 48 | 24 |
Fe/Zn或Fe/Cd5c1B | B | 12 | 72 | 36 | |
Fe/Zn或Fe/Cd5c2C | C | 48 | 120 | 72 | |
Fe/Zn或Fe/Cd5c2D | D | 72 | 168 | 96 | |
Fe/Zn或Fe/Cd5Bk | BK | 12 | / | / | |
Fe/Zn或Fe/Cd8c1A | 8 | A | 6 | 96 | 48 |
Fe/Zn或Fe/Cd8c1B | B | 24 | 120 | 72 | |
Fe/Zn或Fe/Cd8c2C | C | 72 | 168 | 120 | |
Fe/Zn或Fe/Cd8c2D | D | 96 | 192 | 144 | |
Fe/Zn或Fe/Cd8Bk | BK | 24 | 120 | 72 | |
Fe/Zn或Fe/Cd12c1A | 12 | A | 6 | 144 | 72 |
Fe/Zn或Fe/Cd12c1B | B | 24 | 192 | 96 | |
Fe/Zn或Fe/Cd12c2C | C | 72 | 240 | 144 | |
Fe/Zn或Fe/Cd12c2D | D | 96 | 264 | 168 | |
Fe/Zn或Fe/Cd12Bk | BK | 24 | 192 | 96 | |
Fe/Zn或Fe/Cd25c1A | 25 | A | 尚无合适数据 | ||
Fe/Zn或Fe/Cd25c1B | B | ||||
Fe/Zn或Fe/Cd25c2C | C | ||||
Fe/Zn或Fe/Cd25c2D | D | ||||
Fe/Zn或Fe/Cd25Bk | BK | ||||
a、锌镀层的类型代号，见GB/T 9799；镉镀层的类型代号，见GB/T 13346。 b、代号标记方法，见第13章。 c、铬酸盐处理的标记，见下表。 d、薄镀层削弱铬酸盐处理的性能。 | |||||
分级 | 类型代号 | 类型 | 典型外观 | 防护性 |
1 | A | 光亮 | 透明的、光亮的、有时带轻微的蓝色 | 轻度，如：手持时的防锈或者 在中等腐蚀条件下防高湿 |
B | 漂白 | 略带彩虹色且透明的 | ||
2 | C | 彩虹 | 黄彩虹色的 | 相当好，包括对某些有气氛的 防护 |
D | 不透明 | 橄榄绿隐约可见棕色或青铜色 | ||
| Bka | 黑色 | 略带彩虹色的黑色 | 不同程度的腐蚀防护性 |
注：本表比GB/T 9800补充了黑色处理。 | ||||
a、除A~D外，还可选择黑色膜层。 | ||||
镀层标记a（B类b） | 有效表面第1次出现红色铁锈 | ||||
铜或铜合金基体 | 铁金属材料基体 | 中性盐雾试验 （NSS）e | 铜加速盐雾 试验（CASS） | ||
镍 | 镍+铬c,d | 镍c | 镍+铬或铜+镍+铬c,d | ||
Cu/Ni 3b | Cu/Ni 3b Cr r | Fe/Ni 5b | Fe/Ni 5b Cr | / | / |
Cu/Ni 5b | Cu/Ni 5b Cr r | Fe/Ni 10b | Fe/Ni 10b Cr Fe/Cu 10Ni 5b Cr r | 12h | _f |
C u/Ni 10b | Cu/Ni 10b Cr r | Fe/Ni 20b | Fe/Ni 20b Cr Fe/Cu 20Ni 10b Cr r | 48h | _f |
Cu/Ni 20b | Cu/Ni 20b Cr r | Fe/Ni 30b | Fe/Ni 30b Cr | / | 8h |
不推荐 | Cu/Ni 30b Cr r | 不推荐 | Fe/Ni 40b Cr | / | 16h |
a、镍镀层的类型代号，见GB/T 9797。 b、代号标记方法，见第13章。 c、“b”表示光亮镍镀层，而“d”表示镀层双层镍。 d、“r”表示普通套镀铬，最小厚度0.3μm。 e、对Ni/Cr镀层，通常不规定进行中性盐雾试验（NSS）。 f、对较薄的镀层，在铜加速盐雾试验（CASS）中，由于实施时间太短而无意义。 | |||||
Metallic and other inorganic coatings - Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium
Fasteners - Fundamentals of hydrogen embrittlement in steel fasteners
Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods
Fasteners - Hot dip galvanized coatings
Metallic coatings - Electrodeposited coatings of nickel
Chemical conversion coatings - Black oxide coating on iron and steel - Specification and test methods
Specifications of Zinc / Chromate coatings
Chromate conversion coatings on electroplated zinc and cadmium coatings
Metallic coatings - Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(Vl)-free treatment
Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods
Fasteners - Non-electrolytically applied zinc flake coatings systems
Fasteners - Electroplated coating systems
Fasteners—Hot dip galvanized coatings
Passivation of corrosion-resistant stainless-steel fasteners
Metallic coatings - Electrodeposited coatings of nickel
Chromate conversion coatings on electroplated zinc and cadmium coatings
Metallic coatings - Electroplated coatings of copper plus nickel plus chromium on iron or steel
Metallic and Other Inorganic Coatings - Electroplated Coatings of Zinc with Supplementary Treatments on Iron or Steel
Metallic and other inorganic coatings - Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium
Sherardizing of iron and steel articles
Aerospace series - Electrolytic silver plating of fasteners
Corrosion Protection of Metals - Electrodeposited Coatings of Zinc with Supplementary Treatment on Iron or Steel
Fasteners - surface discontinuities - nuts
Fasteners - Surface Discontinuities - Part 1: Bolts, Screws and Studs for General Requirements
Fasteners - Surface Discontinuities - Part 3: Bolts, Screws and Studs for Special Requirements
Water-based epoxy anticorrosive coatings
Electroplated coatings on threaded components - Part 1: Cadmium on Steel Components - Part 2: Zinc on Steel Components
Selection principle and thickness series for metallic and chemical coating
Specification for electroplated coatings of zinc on iron and steel
General specification for fastener aluminum coating for aircraft
