A laboratory study of mild steel vapour phase corrosion and its inhibition by dicyclohexylamine nitrite

被引：31

作者：

Bastidas, JM

Mora, EM

机构：

[1] CSIC, Ctr Nacl Invest Met, E-28040 Madrid, Spain

[2] Univ Politecn Madrid, ETS Ing Navales, E-28040 Madrid, Spain

来源：

CANADIAN METALLURGICAL QUARTERLY | 1998年 / 37卷 / 01期

关键词：

D O I：

10.1016/S0008-4433(97)00033-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A study was made of the corrosion of mild steel by acetic and formic acid vapours at 65, 75, 85 and 100% relative humidity (RH) and its inhibition by dicyclohexylamine nitrite (DICHAN). Electrochemical and gravimetric techniques were used. The corrosion rate of steel was in the range of <10-145 mdd and <10-35 mdd for 225 ppm acetic and 300 ppm formic acid vapours, respectively, at 65-100% RH. DICHAN has been found to provide moderate protection for steel at 65-85% RH. Inhibitor efficiencies were 64% and 71% in acetic and formic acids, respectively, at 100% RH. There is a reasonable correlation between inhibitor efficiencies estimates from weight loss, polarization and noise measurements. X-ray analysis of the corrosion products, in the presence and absence of DICHAN, shows the presence of magnetite (Fe3O4), as principal constituent, along with alpha-FeOOK and gamma-FeOOH. The acetic corrosion product film was of porous nature. (C) 1998 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：57 / 65

页数：9

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