Fouling corrosion in aluminum heat exchangers

被引：0

作者：

Su Jingxin ^{[1
]}

Ma Minyu ^{[1
]}

Wang Tianjing ^{[2
]}

Guo Xiaomei ^{[2
]}

Hou Liguo ^{[2
]}

Wang Zhiping ^{[1
]}

机构：

[1] Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China

[2] Aircraft Maintenance and Engineering Corporation, Beijing Capital International Airport

来源：

Chinese Journal of Aeronautics | 2015年 / 28卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Aluminum; EIS; Heat exchanger; Pitting corrosion; Tafel plots;

D O I：

暂无

中图分类号：

TG172 [各种类型的金属腐蚀]; TK172 [换热设备];

学科分类号：

080503 ; 080702 ;

摘要：

Fouling deposits on aluminum heat exchanger reduce the heat transfer efficiency and cause corrosion to the apparatus.This study focuses on the corrosive behavior of aluminum coupons covered with a layer of artificial fouling in a humid atmosphere by their weight loss,Tafel plots,electrochemical impedance spectroscopy(EIS),and scanning electron microscope(SEM)observations.The results reveal that chloride is one of the major elements found in the fouling which damages the passive film and initiates corrosion.The galvanic corrosion between the metal and the adjacent carbon particles accelerates the corrosive process.Furthermore,the black carbon favors the moisture uptake,and gives the dissolved oxygen greater chance to migrate through the fouling layer and form a continuous diffusive path.The corrosion rate decreasing over time is conformed to electrochemistry measurements and can be verified by Faraday’s law.The EIS results indicate that the mechanism of corrosion can be interpreted by the pitting corrosion evolution mechanism,and that pitting was observed on the coupons by SEM after corrosive exposure.

引用

页码：954 / 960

页数：7

共 19 条

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