锌和锌合金 - 锌涂料，铸造，连接和腐蚀

Topics Covered

Background

锌涂料的应用

锌合金的铸件

加入锌合金

Wrought and Superplastic Zinc Alloys

Corrosion of Zinc Alloys

Background

锌和锌合金用于挤出，铸件，字子，卷纸或绘制的电线，当然也用作保护性涂层。另外两个主要用途是作为牺牲阳极和黄铜合金。

锌涂料的应用

Zinc coatings are either applied from a bath of molten zinc or from a dip of zinc/0.2% aluminium in a strip galvanising line or by thermal spray (or metallising), mechanical plating (called barrel plating after the tumbling process used to carry it out) or else, for thinner coatings, by electroplating.

锌合金的铸件

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锌合金已用于模具铸造已有60多年的历史，白色催眠型合金含量<5％铝用于压力铸件，目前的做法是使用较高强度的型超甲状腺类锌/铝合金的范围。必须将合金污染物最小化以保持机械和腐蚀性特性。锌合金具有低熔点，流动性良好，并且由于相对较快的寒冷速率，尺寸非常稳定。合金在100°C下损失约25％至35％的拉伸强度和屈服强度。

Gravity castings also require high purity stock. Dimensional stability may be assured by a stabilising treatment @250°C for 12 hours followed by furnace cooling. Specialised slush casting alloys are used for hollow objects. Zinc castings are often surface finished and treatments include phosphating prior to painting and anodising, or more commonly chromating, to provide corrosion resistance and prevent white rust during damp storage.

加入锌合金

组件可能会被焊接，悬挂甚至是粘合粘合。使用机械紧固件需要遵守推荐的扭矩。

Wrought and Superplastic Zinc Alloys

Wrought zinc products include zinc or foil with typically <1% alloying addition of copper or lesser quantities of lead, titanium, manganese or cadmium. A superplastic alloy with 21 to 23% aluminium is readily formed into complex shapes.

Corrosion of Zinc Alloys

Zinc is resistant to corrosion by chemicals over a pH range from 6 to 12.5. It produces white corrosion product when kept wet especially when freshly exposed.

Source: Handbook of Engineering Materials, Vol. 1. 5^ThEdition.

For more information on this source please visitThe institute of Metals and Materials Australasia.