CORROSION BEHAVIOR OF PURE Cr AND TWO Cr-CONTAINING ALLOYS BENEATH ZnCl2 AND KCl-ZnCl2 DEPOSITS

J Chin Soc Corr Pro

2002, Vol. 22

Issue (1): 27-31 DOI:

Research Report

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CORROSION BEHAVIOR OF PURE Cr AND TWO Cr-CONTAINING ALLOYS BENEATH ZnCl2 AND KCl-ZnCl2 DEPOSITS

Yuanshi Li;Yan Niu;Weitao Wu

大连理工大学材料系

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Abstract The corrosion behavior of pure Cr，one low alloy st eel and an HP-type heat-resistant steel were studied in the presence of ZnCl2 and KCl-ZnCl2 deposits respectively in oxidizing gaseous environments at 450℃ .All materials suffered from seriously accelerated corrosion beneath mixture sal ts than in single ZnCl2 deposit.The oxide scales formed on pure Cr and heat-re sistant steel were easily to spall and had even worse adherence to the matrix co mpared with that on low alloy steel，whereas the latter had a higher mass gain d uri ng corrosion.Furthermore，Cr-rich Cr7C3 carbides were attacked preferentiall y induced by chlorine in comparison to the matrix of the heat resistant steel.Th e results show that the Cr-containing alloys do not exhibit excellent corrosion resistance to this chlorine-contaminant environment due to the poor adherence of the scales to the matrix.The accelerated corrosion mechanism for those Cr2O 3-forming materials is discussed thermodynamically.

Key words: Cr low alloy steel heat-resistant steel ZnCl 2 KCl corrosion

Received: 20 August 2000

ZTFLH:

TG174.44

Corresponding Authors: Yuanshi Li

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Yuanshi Li; Yan Niu; Weitao Wu. CORROSION BEHAVIOR OF PURE Cr AND TWO Cr-CONTAINING ALLOYS BENEATH ZnCl2 AND KCl-ZnCl2 DEPOSITS. J Chin Soc Corr Pro, 2002, 22(1): 27-31 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I1/27

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