Pitting of zinc: Observations on atmospheric corrosion in tropical countries

被引:56
作者
Cole, I. S. [1 ]
Ganther, W. D. [1 ]
Furman, S. A. [1 ]
Muster, T. H. [1 ]
Neufeld, A. K. [2 ]
机构
[1] CSIRO Mat Sci & Engn, Highett, Vic 3190, Australia
[2] BlueScope Steel Ltd, Port Kembla, NSW 2505, Australia
关键词
Zinc; Steel; Pitting corrosion; Atmospheric corrosion; Oxide coatings; TRANSPORT PROCESSES; PASSIVITY BREAKDOWN; AQUEOUS CHEMISTRY; FULL HYDROLYSIS; METAL-SURFACES; HOLISTIC MODEL; GILDES MODEL; DEPOSITION; AEROSOL; PH;
D O I
10.1016/j.corsci.2009.11.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A five-nation study has investigated the mechanisms and rates of the atmospheric corrosion of zinc and steel in tropical regions in Australia, Thailand, Indonesia, Vietnam and The Philippines. For the study, 18 exposure sites encompassing severe marine, marine, severe industrial, industrial, marine/industrial, urban and highland environments were established across the countries. At each location, zinc and steel plates were exposed for periods of three months and one year, and measurements were taken of a wide range of surface-response and climatic parameters, including gaseous SO(x) and NO(x), airborne salinity, relative humidity (RH) and temperature, rainwater composition, surface temperature and time of wetness (TOW). Exposed plates were used to determine mass loss, the nature of corrosion products (using FTIR and SEM-EDS) and the morphologies of corrosion layers (via SEM-EDS). Regression analysis indicated that the prime factors controlling zinc corrosion rate were climate (temperature and rainfall) and surface-response (TOW), and surprisingly not pollutant levels, despite significant variation in SO(x) levels across the sites. SEM studies indicated the presence of pitting below the oxide layers on zinc, particularly those plates exposed at marine and other sites with relatively low SO(x) levels. In contrast, no pitting was observed (or pits had very low aspect ratios) in the specimens exposed at sites with high SO(x) levels. The possible processes leading to the observed damage patterns are discussed. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:848 / 858
页数:11
相关论文
共 33 条
[1]  
*AS, 1989, 16501989 AS
[2]  
Atteras Haagenruud., 1982, Atmospheric Corrosion, P873, DOI DOI 10.1002/BBPC.19830870621
[3]   A GENERAL CORROSION FUNCTION IN TERMS OF ATMOSPHERIC POLLUTANT CONCENTRATIONS AND RAIN PH [J].
BENARIE, M ;
LIPFERT, FL .
ATMOSPHERIC ENVIRONMENT, 1986, 20 (10) :1947-1958
[4]   Experimental determination of duration of wetness on metal surfaces [J].
Cole, I. S. ;
Ganther, W. D. .
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2008, 43 (02) :156-162
[5]   Experimental determination of time taken for openly exposed metal surfaces to dry [J].
Cole, I. S. ;
Ganther, W. D. .
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2006, 41 (02) :161-167
[6]   What really controls the atmospheric corrosion of zinc? Effect of marine aerosols on atmospheric corrosion of zinc [J].
Cole, I. S. ;
Azmat, N. S. ;
Kanta, A. ;
Venkatraman, M. .
INTERNATIONAL MATERIALS REVIEWS, 2009, 54 (03) :117-133
[7]   Mathematical models of dependence of surface temperatures of exposed metal plates on environmental parameters [J].
Cole, IS ;
Paterson, DA .
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2006, 41 (01) :67-76
[8]   Mechanisms of atmospheric corrosion in tropical environments [J].
Cole, IS .
MARINE CORROSION IN TROPICAL ENVIRONMENTS, 2000, 1399 :33-47
[9]   Holistic model for atmospheric corrosion - Part 1 - Theoretical framework for production, transportation and deposition of marine salts [J].
Cole, IS ;
Paterson, DA ;
Ganther, WD .
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2003, 38 (02) :129-134
[10]   Holistic model for atmospheric corrosion - Part 6 - From wet aerosol to salt deposit [J].
Cole, IS ;
Lau, D ;
Paterson, DA .
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, 2004, 39 (03) :209-218