double layer plating 复层涂敷
The thickness ratio of high and medium phosphorus layers in double Ni plating layer was optimized.
优化了双镍层中的高磷镀镍层与中磷镀镍层的厚度匹配。
Experienced 16 hours of CASS standard test, the plating layer, based on double post-plating nickel layers, still preserves perfect decorative appearance and shows good property of anti-erosion.
双层镍作中间镀层的装饰性铬-镍合金试件经16小时铜加速盐雾试验（CASS）后，外观未出现不良现象。 镀层显示了较好的耐蚀性能。
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