Abstract Tannins have been used to replace chromate in wash-primers as a temporary (“in transit”) protection for metals. In the present work, the anticorrosive properties of “quebracho colorado” tannins were tested in water solution and in wash primers to protect aluminum alloy 1050. Polarization curves (linear and Tafel) and corrosion potential measurements were done on the alloy in contact with different concentrations of the tannin. A tannin wash primer was prepared and coated panels were tested in 100% humidity chamber (ASTM D 2247) and by electrochemical techniques (linear polarization curves, corrosion potentials and ionic resistances). Chromate and talc primers as well as no-coated aluminum alloy were also tested, as control, to compare the results.

中文翻译：

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“quebracho colorado”提取物的防腐性能研究及其在铝1050底漆中的应用

摘要 单宁已被用来替代洗涤底漆中的铬酸盐，作为对金属的临时（“运输中”）保护。在目前的工作中，“quebracho colorado”单宁的防腐性能在水溶液和用于保护铝合金 1050 的清洗底漆中进行了测试。对接触不同浓度的合金进行极化曲线（线性和 Tafel）和腐蚀电位测量的单宁。制备单宁清洗底漆，并在 100% 湿度箱 (ASTM D 2247) 中通过电化学技术（线性极化曲线、腐蚀电位和离子电阻）测试涂层板。还测试了铬酸盐和滑石底漆以及无涂层铝合金作为对照，以比较结果。