为了保持基体金属硬度、磁性以及电镀层性能等均不变，将锌铁合金电镀工艺与磷化工艺进行了组合，以提高钢铁件的防护性能。
Holding primary hardness, magnetism and plating properties of matrix, protection performance of steel was improved by combining the Zn - Fe alloy electroplating and phosphating technology.
采用正交试验法对锌-铁合金镀层三价铬黑色钝化工艺进行优化，并研究了工艺参数对钝化膜外观和耐蚀性等影响。
The bath compositions of trivalent chrome black passivation for zinc-iron alloy coating were optimized by orthogonal test method.
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