丁二酸烷基醯肢之防蝕應用研究

Study on the Anti-corrosion Performance of Succinic Acid N-alkylamide

丁二酸烷基醯胺（Succinic acid n-alkylamide）溶於乙醇、異丙醇等醇類配成稀溶液，塗覆於非外露之鋼材表面，實驗顯示具有良好之防蝕效果，因其不須再作任何處理即可進行機械件之後續加工、組裝或表面塗裝作業，極適合作為加工、組裝前暫存工件之防銹劑。本文乃針對丁二酸酐與不同烷基胺反應而成之丁二酸烷基醯胺之防蝕性能進行比較，同時探討溶液濃度、塗覆方式及不同添加劑對防蝕效果之影響。研究內利用呈色反應快速檢測、酸性及高濕環境試驗，均可評估各種試劑防蝕性之優劣。由實驗結果顯示，隨著烷基鏈之不同，丁二酸烷基醯胺之防蝕性有很大的差異，其中以丁二酸正辛基醯胺及丁二酸正癸基醯胺之防蝕效果較佳，而且發現添加5%油酸可提高3倍之防蝕效果。其防蝕效果與塗層之表面結構有關，由SEM或電子影像放大系統表面觀察可明顯看出其差異。

In this study, a series of succinic acid n-alkylamide were synthesized and used as inhibitors. The coating can be applied by spraying, brushing or dipping for tentative protection of metallic articles for further processing or painting. Coating solutions were prepared by dissolving various amounts of succinic acid n-alkylamide within the range of 3-15 wt% in isopropanol. We used the Ferroxyl Test to examine the defects of various coatings in 1020 carbon steel rapidly. Furthermore, the corrosion test exposed the 1020 carbon steel to an acetic acid containing environment at 25℃, 95% RH. Experimental results showed that the corrosion protection efficiency of the coated steel was dependent on the concentration of the coating solution and the treatment method. On the other hand, the performance of the coating such as succinic acid n-octylamide (SAOA) and succinic acid n-decylamide (SADA) could be changed by adding some chemicals. The results showed that the best corrosion protection of the coatings of SAOA or SADA was obtained by adding small amounts of oleic acid. The anti-corrosion performance was related to the morphology of the coatings examined by SEM or electrical image enlarging system.