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K帽电镀时为什么要除氢处理?

来源:K帽厂家   发布时间:2017-8-31 9:03:26   点击量:

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氢脆的原理与预防/除氢处理
皇冠即时比分 铁零件镀锌过程中,除锌的电沉积外,往往伴随有氢离子还原析氢的副反应。氢还原一部分变成气体逸出,还有一部分以氢的原子形态渗入到镀层和基体金属晶格的点阵中去,造成晶格歪扭,零件内应力增加,镀层和基体变脆,人们称之为氢脆。氢脆对材料的力学性能危害很大,如不除去,会影响零件的寿命,甚至造成机器的破坏事故。因此某些钢材或用于特殊条件下的零件,须进行除氢处理,例如飞机上使用的镀锌件都要经过除氢处理。弹性零件和高强度钢上镀锌也需要进行除氢。除氢采用加热处理法将氢从零件内部赶出去。除氢效果与除氢温度、保温时间有关。温度高,时间长除氢越好。但加热温度不能太高,超过250℃锌结晶组织变形、发脆,耐蚀性明显下降。一般用l90℃~230℃,2h~3h。渗碳件和锡焊件除氢温度是140℃~l60℃,保温3h。

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