EFFECT OF SOLUBLE SALTS ON UNDERFILM CORROSIONOF ZINC SUBSTRATE AND FAILURE OF THE COATINGS

J Chin Soc Corr Pro

2003, Vol. 23

Issue (3): 144-148 DOI:

Research Report

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EFFECT OF SOLUBLE SALTS ON UNDERFILM CORROSIONOF ZINC SUBSTRATE AND FAILURE OF THE COATINGS

Yongxiang Xv;Chuanwei Yan;Yanmin Gao

北京航空材料研究所

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Yongxiang Xv; Chuanwei Yan; Yanmin Gao. EFFECT OF SOLUBLE SALTS ON UNDERFILM CORROSIONOF ZINC SUBSTRATE AND FAILURE OF THE COATINGS. J Chin Soc Corr Pro, 2003, 23(3): 144-148 .

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Abstract Effect of 6 soluble salts on under film corrosion of metal and failure of the coatings were studied by means of exposed samples.The results show that the acceleration of NaCl to corrosion of zinc substrate is les s than that of Na2SO4 and similar with that of Na2SO3 and FeSO4.NaNO 3 acceleates greatly blistering of the coatings and affects relatively less the corrosion of the substrate.ZnCl2,however,has no harmful effects either on corr o sion of the zinc substrate or on failure of the coatings,and even has some inhib iting effect on corrosion of the substrate.The reason may be that the corrosion product when there is ZnCl2 is unsoluble Zn5(OH)8Cl2.The order that solu ble salts accelerate underfilm corrosion is as:Na2SO4≈Na2SO3＞NaCl≈FeS O4＞NaNO3ZnCl2;while the order of accelerating blistering is as:NaNO3 ≈Na2SO4＞ NaCl＞FeSO4≈Na2SO3ZnCl2.Polyurethane coating provides better pro tection than alkyd coating.Because the polarity of the molecule of polyurethane is greater than that of alkyd,the polyurethane coating can provide greater resis tance to O2 than alkyd coating.FTIR analysis shows that H-bond is formed betwe en the water molecule and the C=O group of the coatings,and therefore the water can permeate through the coatings much faster than O2.There is intermolecular H-bond 〖JG(〗O〖ZJZ；Y〗C〖ZJLX，S〗〖SX(B-*9〗H〖〗O〖DD(〗··〖DD)〗〖SX) 〗〖ZJS〗N〖ZJZ；Y〗C〖ZJLX，X；Y〗〖SX(B-*9〗O〖〗H〖DD(〗·· 〖DD)〗〖SX)〗〖ZJX〗N〖ZJZ；Y〗O〖ZJY〗〖JG)〗 in the structure of polyurethane,so the available sites for the water mol lcules to react is less than in alkyd coating.Therefore the capacity of polyu rethane to resist water is better than that of alkyd.

Key words: soluble salts zinc substrate coatings corrosion degrad ation

Received: 12 October 2001

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