Study of a New Chromium-Free Conversion Coating Formed on ZnAl Alloy
来源期刊：材料热处理学报2004年第5期
论文作者：YANG Ning HAN Xia-yun GUO Zhong-cheng LONG Jin-ming
关键词：Zinc alloy; Chromium-free Conversion coating; Rare earth salt; organic inhibitor; Corrosion protection;
摘 要：A new chromium-free conversion film was obtained on surface of a ZnAl alloy by chemical conversion process.Influence of the additives in treating solution containing cerium salt on the corrosion protection of the conversion film formed on zinc alloy was investigated. Corrosion tests and electrochemical measurements in sodium chloride solution were performed. The microstructure and composition of the coatings were examined by means of SEM, EDS and XRD. It was found that the corrosion protection capabilities of the conversion film are markedly increased with the cerium nitride plus additives (hydrogen fluoride acid and an organic inhibitor) treating process. The modified conversion film is an organic/inorganic composite coating and is much more corrosion resistant than the conventional chromate conversion coating and the single cerium conversion coating.
YANG Ning1，HAN Xia-yun1，GUO Zhong-cheng1，LONG Jin-ming1
(1.Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming, China)
摘要:A new chromium-free conversion film was obtained on surface of a ZnAl alloy by chemical conversion process.Influence of the additives in treating solution containing cerium salt on the corrosion protection of the conversion film formed on zinc alloy was investigated. Corrosion tests and electrochemical measurements in sodium chloride solution were performed. The microstructure and composition of the coatings were examined by means of SEM, EDS and XRD. It was found that the corrosion protection capabilities of the conversion film are markedly increased with the cerium nitride plus additives (hydrogen fluoride acid and an organic inhibitor) treating process. The modified conversion film is an organic/inorganic composite coating and is much more corrosion resistant than the conventional chromate conversion coating and the single cerium conversion coating.
关键词:Zinc alloy; Chromium-free Conversion coating; Rare earth salt; organic inhibitor; Corrosion protection;
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