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| CO-DEPOSITION OF Cr AND A1 BY PACK CEMENTATION AND THE RESISTANCE OF SUCH COATINGS AGAINST OXIDATION AND HOT CORROSION |
| Chu Huer Cao Tieliang and Shi Shengtai (SHIH; S. T;)(Shanghai Institute of Metallurgy: Academia Sinica) |
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Abstract Although aluminide coatings have good oxidation resistant properties, their hot corrosion resistance is not satisfactory. It is thought that Cr-Al coatings may improve the high temperature corrosion resistance over that of aluminide coatings. Is it possible to produce a Cr-Al coating by a single step pack process? How good is the corrosion resistance of the Cr-Al coatings? These problems are discussed in this article. The experimental results show that it is difficult to obtain Cr-Al coatings on pure Ni by a single step pack cemenation process because aluminium deposited on nickle specimen and chromium powder reduces activity of chromium greatly, thereby hampering the chrominizing process. It is possible to form Cr-Al coatings by two-step pack processes. However the order of coating steps is very essential: a useful Cr-Al coating which can resist oxidation and hot corrosion can be produced by means of aluminizing after chrominizing, but an uncompact Cr-Al coating which contains many holes and doos not well resist oxidation and hot corrosion well be formed by chominizing.
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Received: 25 April 1987
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Cite this article:
Chu Huer Cao Tieliang and Shi Shengtai (SHIH; S. T;)(Shanghai Institute of Metallurgy: Academia Sinica). CO-DEPOSITION OF Cr AND A1 BY PACK CEMENTATION AND THE RESISTANCE OF SUCH COATINGS AGAINST OXIDATION AND HOT CORROSION. J Chin Soc Corr Pro, 1987, 7(2): 77-82.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1987/V7/I2/77
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