A brightpickling and chromating process for copper pipes was introduced.
介绍了一种紫铜管光亮酸洗钝化工艺。
2
The no pollution brightpickling passivation technique of copper parts introduced in this pa-per, has neither the toxic chromium containing materials nor nitrogen oxide pollution.
本文介绍的铜制件光亮酸洗钝化工艺，既无有毒的含铬物质，又无氮氧化物污染。
3
Pickling or bright dipping in acid can remove this magnetic film and restore the non-magnetic properties.