Abstract
It had validated by experiments why appending rare earth nitrate (REN) into the bath affects notably on development of coating-forming, corrosion resistance as well as on urgency varieties of appearance and component of the coating. The causation rests with the fact that REN not only makes metal surface depolarized and cathodic reactions accelerated, but also acts as crystal nucleus with gel forms on the metal surface to speed up the coating-forming and develop the anti-corrosion capacity of the coating. The optimal level of addition of REN is 30-55 mg·L-1.
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