... UNDER COATING 镀层不够 UNDER PICKLE 欠酸洗 OVER PICKLE 过酸洗 ...
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酸洗不足、欠酸洗 underpickling
欠酸洗
underpickling
以上为机器翻译结果，长、整句建议使用 人工翻译 。
脱脂及酸洗处理欠好会形成镀层附着力欠好，镀不上锌或锌层掉落。
Degreasing and pickling treatment will lead to the formation of good adhesion of the coating is not good, not on the zinc or zinc coating layer.
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