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铸件表面处理的种类有哪些

发布时间:2018-04-02点击量:49

表面处理的种类很多,最常见的有:电镀、油漆、喷塑、热浸、真空镀、热喷、“达克罗”、机械镀、氧化和钝化等。

所有的表面处理工艺,各有优缺点,效果好坏要根据用途决定,如为了防锈都用镀锌,再进一步说,如用在室内一般选电镀锌,而在室外就选热浸锌或热喷锌好,要求更高的还要再进行涂漆。而为了装饰,用镀锌就不好。所以只有决定了使用场合、目的等,才能选择最好的表面处理工艺。镀锌和喷银塑相比,如用在装饰性上,用喷银饰比镀锌好;如果是紧固件等使用时要有尺寸控制,还要摩擦,选喷银塑就不能用。

喷银塑外观均匀,色泽一致,色彩持久不变,常用在仪器仪表的外壳防护和装饰;镀锌外观易变暗,装饰性远不如喷银塑好。

There are many kinds of surface treatment, the most common are: plating, paint, spray, hot dip, vacuum plating, thermal spraying, "Dacromet", mechanical plating, oxidation and passivation.

All the surface treatment processes have their own advantages and disadvantages. The effect is decided according to the purpose. For example, galvanizing is used for rust prevention. Further, if it is used indoors, electroplating of zinc is generally selected, while outdoor selection of hot dip galvanizing or Hot spray zinc is better, and the paint is required to be higher. For decoration, galvanization is not good. Therefore, the best surface treatment process can be selected only when the use occasion and purpose are determined. Compared with sprayed silver plastic, galvanized and sprayed silver plastic is better than silver plating if it is used for decorative purposes; if it is a fastener, etc., it must be used for dimensional control and friction, and silver spray plastic cannot be used.

Jet silver plastic uniform appearance, uniform color, color lasting, commonly used in instrumentation shell protection and decoration; galvanized appearance is easy to darken, decorative far better than spray silver plastic.