Pitting corrosion of 12Kh18AG18Sh steel in chloride solutions

被引：13

作者：

Balyts'kyi, OI ^{[1
]}

Krokhmal'nyi, OO ^{[1
]}

机构：

[1] Ukrainian Acad Sci, Karpenko Physicomech Inst, Lviv, Ukraine

来源：

MATERIALS SCIENCE | 1999年 / 35卷 / 03期

关键词：

Nitrogen; Iron; Chloride; Chromium; Manganese;

D O I：

10.1007/BF02355483

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We experimentally established that the corrosion rate of 12Kh18AG18Sh steel in a 22% NaCl solution in the temperature range 20-100 degrees C does not exceed 0.22 g/(m(2) . h) (or 0.277 mm/year). The material undergoes self-passivation with the formation of a protective passive film of Fe-3 O-4 + (Fe, Cr)O-2(3) + (Mn, Fe)(2) O-3. Fitting resistance of steel decreases in solutions with a concentration of chloride ions of above 0.2 mole/liter and temperatures of at least 40 degrees C. We studied selective dissolution of certain components of steel and found that manganese is most soluble. Ionization of chromium occurs more slowly than that of the iron matrix. As a result of selective dissolution of steel, the passive film is depleted of manganese and nitrogen.

引用

页码：389 / 394

页数：6