| Study of a New Chromium-Free Conversion Coating Formed on ZnAl Alloy |
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| 作者姓名： | LONG Jin-ming GUO Zhong-cheng HAN Xia-yun YANG Ning Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming China |
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| 作者单位： | LONG Jin-ming，GUO Zhong-cheng，HAN Xia-yun，YANG Ning Faculty of Materials and Metallurgical Engineering，Kunming University of Science and Technology，Kunming，China |
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| 摘 要： | BECAUSE OF A HIGHER CHEMICAL ACTIVITYzinc and zinc alloys(in bulk or in coating form)corrode rapidly in moist atmospheres recovering withwhite corrosion products—white rust and in acidicclimatic conditions becoming greyl].So passivition orchemical conversion treatments is often needed fortheir corrosion protection.This is generally done bymeans of chromate treatment which offers a goodcorrosion inhibition.However,chromates are highlytoxic and carcinogenic2]and their use can lead…
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Study of a New Chromium-Free Conversion Coating Formed on ZnAl Alloy |
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| LONG Jin-ming,GUO Zhong-cheng,HAN Xia-yun,YANG Ning Faculty of Materials and Metallurgical Engineering,Kunming University of Science and Technology,Kunming,China.Study of a New Chromium-Free Conversion Coating Formed on ZnAl Alloy[J].Transactions of Materials and Heat Treatment,2004,25(5). |
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| Authors: | LONG Jin-ming GUO Zhong-cheng HAN Xia-yun YANG Ning |
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| Abstract: | 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. |
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| Keywords: | Zinc alloy Chromium-free Conversion coating Rare earth salt organic inhibitor Corrosion protection |
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