杂环化合物对热浸镀锌铝合金镀层在稀盐酸中的缓-中国有色金属学报.PDFVIP

第 18 卷第 1 期 中国有色金属学报 2008 年 1 月 Vol.18 No.1 The Chinese Journal of Nonferrous Metals Jan. 2008 文章编号：1004-0609(2008)01-0177-10 杂环化合物对热浸镀锌铝合金镀层在稀盐酸中的缓蚀作用 鞠 虹1, 2 ，李 焰1 (1. 中国科学院 海洋研究所，青岛 266071 ；2. 中国科学院 研究生院，北京 100039) 摘 要：为找到在热浸镀钢材表面清洗处理过程中替代铬酸使用的缓蚀剂，通过质量损失测试、电化学测试和扫 描电镜分析等方法研究了烟酸、吖啶和小檗碱对热浸镀 5%铝−锌和 55%铝−锌合金镀层在盐酸介质中的缓蚀作用。 结果表明，3 种杂环化合物在盐酸介质中对两种锌铝合金镀层均具有良好的缓蚀作用，其中小檗碱的缓蚀作用最 好；它们通过单分子层、化学吸附方式吸附在镀层表面从而阻滞酸液对镀层的腐蚀，其吸附遵从 Langmuir 吸附等 温式。在盐酸介质中，烟酸、吖啶和小檗碱对 5%铝−锌和 55%铝−锌合金镀层钢材均为有效的环境友好型缓蚀剂。 关键词：缓蚀剂；杂环化合物；盐酸；电化学阻抗谱 中图分类号：TG 174.42 文献标识码：A Corrosion inhibition of hot dipping Zn-Al alloy coated steels by heterocyclic compounds in diluted HCl solutions JU Hong1, 2, LI Yan1 (1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China) Abstract: In order to find chromate-substituting inhibitor in finishing process of hot dipping coated steels, the inhibition effects of nicotinic acid, acridine and berberine on the corrosion of hot dipping 5%Al-Zn and 55%Al-Zn alloy coated steels in diluted HCl solution were investigated using mass loss test, electrochemical measurement, and scanning electronic microscope analysis. The results indicate that these three heterocyclic compounds, especially berberine, can act as good inhibitors for both kinds of Zn-Al alloy coatings in HCl solutions. These compounds can adsorb on the coating surface by chemical adsorption with single molecular layer by following Langmuir adsorption isotherm. Nicotinic acid, acridine and ber