ELECTROCHEMICAL CORROSION BEHAVIOR OF ALLOY-400 - INTERGRANULAR CORROSION IN ACIDIC NA2SO4 SOLUTIONS

被引：6

作者：

DE, PK

BOSE, A

机构：

[1] Bhabha Atomic Research Cent, Bombay

来源：

CORROSION | 1993年 / 49卷 / 02期

关键词：

ALLOY-400; CUPRIC CHLORIDE; GRAIN BOUNDARY SEGREGATION; MICROSTRUCTURE; NICKEL-COPPER ALLOYS;

D O I：

10.5006/1.3299208

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of heat treatments on the anodic polarization behavior of alloy 400 in acidic Na2SO4 solutions with different pH values and chloride contents has been studied. Alloy 400 is susceptible to intergranular corrosion (IGC) in 0.5 N Na2SO4 solution (pH 3) containing 0.2% CuCl2. For the same heat treatment (soaking for one hour at 900-degrees-C), the extent of IGC appears to be significantly affected by the cooling rate, which is greater for faster cooling (e.g., water quenching). Aging the water-quenched alloy at 500-degrees-C enhances IGC susceptibility, and aging at higher temperatures imparts resistance to IGC. Note that addition of small amounts of hafnium has a beneficial effect on the resistance to IGC of alloy 400 under similar exposure conditions. An attempt has been made to rationalize the observations in terms of segregation of sulfur and phosphorus to the grain boundaries.

引用

页码：135 / 145

页数：11

共 19 条

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BROWN J, 1986, 25 P ANN C MET NICK, V2

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