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Correlation between accelerated tests and outdoor exposure of coil coated chromate and chromate free systems

机译:卷材镀铬和无铬系统的加速测试与室外暴露之间的相关性

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摘要

Despite the good corrosion resistance of chromate coatings, there is a general agreement in eliminating the Cr(VI) compounds for corrosion protection owing to their health hazards. Coil coaters are looking for maintained or improved anticorrosion properties. Therefore, coil coated materials painted with conventional polyester topcoat and with either standard strontium chromate or water based epoxy Cr(III) primer were evaluated through a battery of accelerated and outdoor exposure tests. Physicochemical properties, corrosion potential and electrochemical impedance were measured before and after exposure of coated panels in salt spray, humidity or weathering chambers. Experimental results showed that the conventional chromatised polyester primer/polyester topcoat system provides better protective properties than the water base epoxy primer with Cr(III)/polyester system. This was also observed in replicated panels exposed outdoor but just after two years. The protection mechanism was analysed on the basis of the experimental results and the applied formulation type.
机译:尽管铬酸盐涂层具有良好的耐腐蚀性,但由于其对健康的危害,人们普遍同意消除用于腐蚀防护的六价铬化合物。卷材涂布机正在寻找保持或改善的防腐性能。因此,通过一系列加速和室外暴露测试,对涂有常规聚酯面漆和标准铬酸锶或水基环氧Cr(III)底漆的卷材涂料进行了评估。在盐雾,湿度或风化室中暴露涂膜板之前和之后,测量理化性质,腐蚀电位和电化学阻抗。实验结果表明,与采用Cr(III)/聚酯体系的水基环氧底漆相比,常规的铬酸盐聚酯底漆/聚酯面漆体系具有更好的保护性能。在暴露于室外但仅两年后的复制面板中也观察到了这一点。根据实验结果和所采用的制剂类型对保护机理进行了分析。

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