Perforation corrosion mechanisms of zinc coated steel sheets in automotive bodies were studied by field vehicle tests and several types of corrosion tests. Perforation corrosion occurred at the uncoated portion in the lapped parts and proceeded in the following order of period: galvanic protection of the coating, protection by corrosion products, corrosion of steel substrate, and perforation. The rate of corrosion in each process depended significantly on atmospheric exposure conditions and portions in the automotive bodies. In environments which produce high corrosion rates, coating is largely ineffective against perforation corrosion because galvanic protection and protection by corrosion products cannot by maintained over the long term. Conversely, coating is highly effective under atmospheric conditions which produce low corrosion rates because galvanic protection and protection by corrosion products continue to protect the steel substrate over an extended period. An index of a magnification is suggested for corrosion resistance under each atmospheric condition. It may be possible to estimate perforation corrosion life by using this index.
Perforation corrosion mechanisms and life of coated steel sheets for automotive bodies
Lochkorrosionsmechanismen und die Lebensdauer von oberflächenveredelten Feinblechen für den Karosseriebau
Titel japanisch
Kawasaki Steel Giho ; 27 , 3 ; 163-168
1995
6 Seiten, 10 Bilder, 2 Tabellen, 6 Quellen
Article (Journal)
Japanese
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