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。 |
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Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods
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