四硫钼铵盐对热浸镀锌钢板耐蚀性之作用.pdf

四硫鉬銨鹽對熱浸鍍鋅鋼板耐蝕性之作用 防蝕工程　第二十三卷第三期　第195 ～ 202 頁　2009 年9 月 Journal of Chinese Corrosion Engineering, Vol. 23, No. 3, pp. 195 ~ 202 (2009) 郭敬國* 、吳俊辰 Effect of Ammonium Tetrathiomolybdate Salt on the Corrosion Resistance of Hot-Dipped Galvanized Steels C. K. Kuo*, C. C Wu Received 29 August 2008; received in revised form 27 April 2009; accepted 13 may 2009 本研究以四硫鉬銨鹽[(NH ) MoS ]為無鉻型處理劑對熱浸鍍鋅鋼片進行塗覆，並探討 4 2 4 附著於鍍鋅鋼片的成膜型態及其耐蝕性質。實驗結果顯示經處理之熱浸鍍鋅鋼片表面，可 獲得淡黃色含 Mo-S 化合物之膜層，該膜層之熱浸鍍鋅鋼片相較未處理之熱浸鍍鋅鋼片有 較佳之耐蝕性。以FT-IR 分析於 880 cm-1 有Mo-O 特徵峰的存在；SEM 分析皮膜與金屬之 表面形貌；GDS 分析其鉬、硫之膜重約0.051 g/m2 ，其元素之原子百分濃度比為Mo (0.95%) 、 S (3.23%) ；極化曲線結果顯示含Mo-S 膜層的鈍化較著重鍍鋅層反應的陽極過程；耐蝕性 結果顯示含Mo-S 膜層的熱浸鍍鋅鋼片於8 小時內之鹽霧環境中無白銹生成。綜述其結果， 在浸泡溶液濃度、反應時間等條件之調控下，藉由上述分析方法可確認四硫鉬酸鹽於鍍鋅 鋼片上成膜之可行性及對耐蝕性有正面效益。 關鍵詞：熱浸鍍鋅；Mo-S 化合物；鈍化皮膜。 ABSTRACT A non-chromate aqueous agent, ammonium tetrathiomolybdate, was coated on the surface of a hot-dipped galvanized steel (GI). Properties of the coating conformation and the corrosion resistance of the coated GI were studied. The results show that the corrosion resistance of the modified GI with a yellowish Mo-S coating layer was better than that of the GI without the coating layer. The FT-IR analysis disclosed the presence of Mo-O (880 cm-1). Scanning electron microscopy was used to analyze the morphologies of the coating layer and the metal surface. The results of g