IMPROVEMENT OF CORROSION RESISTANCE OF BORONIZINGLAYER IN MOLTEN ZINC BY ADDITION OF RARE-EARTH ELEMENT

J Chin Soc Corr Pro

2006, Vol. 26

Issue (3): 180-183 DOI:

Research Report

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IMPROVEMENT OF CORROSION RESISTANCE OF BORONIZINGLAYER IN MOLTEN ZINC BY ADDITION OF RARE-EARTH ELEMENT

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河北工业大学

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Abstract The layer of Fe-B compounds obtaining through boronizing method has very good corrosion resistance.But in boride coatings many physical defects exist,which limits the protective life of the coatings.In order to improve the corrosion resistance of the boride layer,this paper,which directs towards the problem of corrosion in molten zinc urgently to be desiderated in galvanizing industry currently ,studies the effect of the rare- earth element on the corrosion resistance of boroning layer in molten zinc.The boride coatings were investigated in molten zinc at 500℃.Results indicates the anti-corrosion ability of the co-cementation layer is 3 times more than that layer without rare-earth element,the reason is as follows:On one hand,the co-cementation can improve the homogeneous distribution of alloying elements and the surface condition of the layer and reduce the surface defect,as a consequence,the time of the crack nucleation was put off,it is difficult to form the pass of the zinc liquid.On the other hand,addition of rare -earth element can improve the toughness of boride coating,raise resistance of crack and make further improvement on its service life of corrosion resistance in molten zinc.

Key words: molten zinc corrosion boronizing Fe-B compound corrosion resistivity

Received: 24 March 2005

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. IMPROVEMENT OF CORROSION RESISTANCE OF BORONIZINGLAYER IN MOLTEN ZINC BY ADDITION OF RARE-EARTH ELEMENT. J Chin Soc Corr Pro, 2006, 26(3): 180-183 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2006/V26/I3/180

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