电镀工艺表面处理

表面处理

Surface finishing

1、热浸锌：

Hot-dip galvanizing

概述：热浸锌是将除锈后的钢构件浸入600℃左右高温融化的锌液中，使钢构件表面附着锌层，锌层厚度对5mm以下薄板不得小于65μm，对厚板不小于86μm。从而起到防腐蚀的目的。

definition:Hot-dip galvanizing is a form of galvanization. It is the process of coating steel parts with a thin Zinc layer, by passing the metal through a molten bath of zinc at a temperature of around 600 °C. When the thickness of sheet metal is below 5mm, the Zinc layer must be above 65μm; and the Zinc layer should be above 86μm for those thick plates. After the process, it can improvethe corrision resistance and tarnish resitence of the products.

优点：耐久年限长，生产工业化程度高，质量稳定。因而被大量用于受大气腐蚀较严重且不易维修的室外钢结构中。如大量输电塔、通讯塔等。

Advantages: After hot-dip galvanizing, the products are more durable, the manufacturing process is highly industrialized and the quality is very stable.And so, it is widely applied in the outdoor steel structures which are facing serious atmospheric corrosion and inconvenient maintenance, such as the power transmission towers and communications towers, etc.

2、达克罗（DACROMET）：

Dacromet:

概述：达克罗是DACROMET译音和缩写，简称达克罗、达克锈、迪克龙。国内命名为锌铬涂层Zinc cr coating，是一种新型的耐腐涂层与传统的电镀锌相比：锌铬涂层耐腐蚀性能极强，是镀锌的7—10倍，无氢脆性，特别适用于高强度受力件，高耐热性、耐热温度300℃，尤其适用于汽车、摩托车发动机部件的高强度构件，高渗透性、高附着性、高减磨性、高耐气候性、高耐化学品稳定性、无污染性。

Decromet is new coating with excellent decay resistance named by zinc-chromium coating in China. Compared with the traditional electrogalvanizing coatings, zinc-chromium coating have a very good performance of corrosion resistance and tarnish resistance, about 7~10 times better than Zinc coating. It is without hydrogen embrittlement. It’s specially applied in high-strength forced components; it is heat-durability and the heat-resistant temperature was 300℃, specially suitable to the high-strength components in engine of automabile and motorcycle; it is with high penetrability and , adhesion or wettability, wear resistance, electrical

stability and pollution-free。

优点：

（1）无污染和公害；（2）高耐热性；（3）超强的耐蚀性能；（4）良好的渗透性；（5）无氢脆性；（6）结合力及再涂性能好。

Advantages:

(1), pollution-free; (2), heat-durability; (3), corrosion resistance and tarnish resistance; (4), high penetrability;（5）No hydrogen embrittlement; （6）good adhesion and overcoatability.

3、耐落：Nylok

概述：耐落螺纹防松技术是以特殊技术使特殊的工程树脂永久粘附在螺纹上，利用工程树脂材料的反弹性，使螺纹在锁紧过程中通过挤压达到对震动及冲击的绝对阻力，彻底解决了螺纹的松动问题。

Nylok thread anti loosening Technology adopts special technologies to make the engineering plastics clinging to thread permanently. By using the elasticity of the engineering plastics, it will make the threads squeeze in the interlock process to cause ABSOLUTE resistence of vibration and shock, and solve the problem of thread loosing for ever.

优点：彻底解决了螺纹的松动问题。

Advantages:

Solved the problem of thread lossing foreve.

3、钝化：passivation

概述：钝化是使金属表面转化为不易被氧化的状态，而延缓金属的腐蚀速度的方法。

Passivation is the process of making a material "passive", usually by the deposition of a layer of oxide that adheres to the metal surface. It can retard the progress of metal corrosion.

优点：经济实用，同时添加了高效缓蚀剂、抑雾剂，防止金属出现过腐蚀和氢脆现象、抑制酸雾的产生。

Advantages:

It’s economical and practical; meanwhile, it has been added Acid Fog Inhibitor and corrosion inhibitor, which can prevent the corrosion and hydrogen embrittlement; inhibit the production of Acid fog.

4、磷化：phosphorization