The acid depletes the steel surface of acid soluble species, leaving the highly reactive chromium on the surface in a compounded oxide form.

酸可减少钢表面的酸可溶性物质，使得表面的高反应性的铬处于复合氧化物形式。

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Special treatment is recommended to activate beryllium copper surface before chromium plating. And special steps which differ from conventional chromium plating on steel parts are to be taken.

在铍青铜合金上电镀铝，需在镀铝前作特殊的表面活化处理，镀铬时也有不同于钢铁件镀铬的操作方法。

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The development progress on chromium-free coated steel sheet in Japan iron& steel enterprises was introduced.

为此翔实地介绍日本钢铁业在开发无铬表面处理钢板领域的进展。

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