((1. 中國科學院 海洋研究所，青島 266071；2. 中國科學院 研究生院，北京 100039))
摘 要: 為找到在熱浸鍍鋼材表面清洗處理過程中替代鉻酸使用的緩蝕劑，通過質(zhì)量損失測試、電化學測試和掃描電鏡分析等方法研究了煙酸、吖啶和小檗堿對熱浸鍍5%鋁−鋅和55%鋁−鋅合金鍍層在鹽酸介質(zhì)中的緩蝕作用。結果表明，3種雜環(huán)化合物在鹽酸介質(zhì)中對兩種鋅鋁合金鍍層均具有良好的緩蝕作用，其中小檗堿的緩蝕作用最好；它們通過單分子層、化學吸附方式吸附在鍍層表面從而阻滯酸液對鍍層的腐蝕，其吸附遵從Langmuir吸附等溫式。在鹽酸介質(zhì)中，煙酸、吖啶和小檗堿對5%鋁−鋅和55%鋁−鋅合金鍍層鋼材均為有效的環(huán)境友好型緩蝕劑。
關鍵字: 緩蝕劑；雜環(huán)化合物；鹽酸；電化學阻抗譜
（(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 berberine, therefore, are effective and environmental friendly corrosion inhibitors for 5%Al-Zn and 55%Al-Zn alloy coated steels in diluted HCl solutions.
Key words: inhibitor; heterocyclic compounds; hydrochloric acid; EIS
