耐指紋処理鋼板の高温塗膜密着性におよぼす電気亜鉛めっき層中不純物の影響

概要

論文の詳細を見る
Influence of the impurities in electrogalvanized coatings on film adhesion in organic composite coated steel sheets was investigated. A trace of Pb in the electrogalvanized coating layer caused a marked deterioration in film adhesion at high temperature, while the addition of Ni effectively improved it. A chromate conversion film on an electrogalvanized coating layer containing Pb was found to have larger amounts of the OH group than a film on a zinc coating containing Ni. It is suggested that the larger quantity of H2O generated from the electrogalvanized coating containing Pb by a dehydration reaction at elevated temperature progressively attacked the surface of the electrogalvanized coating layer, producing ZnO and H2 gas, which caused deterioration of film adhesion, leading to delamination and blisters during the hot pressprocess.