A COMPARATIVE-STUDY ON THE PASSIVATION AND LOCALIZED CORROSION OF ALPHA-BRASS, BETA-BRASS AND ALPHA+BETA-BRASS IN BORATE BUFFER SOLUTIONS CONTAINING SODIUM-CHLORIDE .1. ELECTROCHEMICAL DATA

被引：68

作者：

MORALES, J ^{[1
]}

FERNANDEZ, GT ^{[1
]}

ESPARZA, P ^{[1
]}

GONZALEZ, S ^{[1
]}

SALVAREZZA, RC ^{[1
]}

机构：

[1] INIFTA,RA-1900 LA PLATA,ARGENTINA

来源：

CORROSION SCIENCE | 1995年 / 37卷 / 02期

关键词：

D O I：

10.1016/0010-938X(94)00108-I

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The passivation and localized corrosion of alpha-, beta-, and (alpha + beta)-brass in borate-boric acid buffer solutions (pH 9) containing different NaCl concentrations (c(NaCl)) were studied comparatively using conventional electrochemical techniques at 25 degrees C. The passivation of brass in borate-boric acid buffer was due to the electroformation of a complex passive layer consisting of ZnO.xH(2)O and Cu-2 O-CuO. In NaCl-containing borate-boric acid buffer the breakdown of the passive layer occurs Leading to pitting corrosion when the applied potential exceeds a certain critical value, E(b). For a given type of brass, the value of E(b) is shifted negatively as c(NaCl) is increased. At a constant c(NaCl) the localized corrosion resistance of brass increases in the following order (alpha + beta)-brass congruent to beta-brass < alpha-brass. For all brass the localized corrosion resistance was lower than that of polycrystalline Cu, but considerably greater than that of polycrystalline Zn. Passive film composition and de-alloying can account for the localized corrosion resistance of these alloys.

引用

页码：211 / &

共 22 条

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[2]

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