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《Cleaning World》 2006-10
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Optimization of passivation techniques of sodium nitrite

ZHOU Ping,MA Zheng(The Cleaning Technology Research Institute of Datong,Datong,Shanxi 037008)  
All passivation techniques with sodium nitrite were compared,the quality of passivation film was examed with the acidic CuSO_4 dropping method.The NaNO_2 passivation technique was the best choice,which could form good passivation film.
【Key Words】: sodium nitrite passivation passivation film
【CateGory Index】: TG178
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