Must do derusting and to oxidation film processing, generally use chemical polishing or electrolytic polishing.
必须先做除锈及去氧化膜处理，一般使用化学抛光或电解抛光。
Through people's long-time study, a way of no pollution is found for derusting-super high pressure jet derusting.
通过人们长期的努力摸索、研究，找到了一种无污染的除锈方法——超高压水射流除锈。
The production sodium hydride achievement treats the golden industry zinc sheet iron's derusting medicinal preparation;
生产氢化钠作为治金工业锌铁板的去锈剂；
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