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Promoting effect of low concentration of benzotriazole on the corrosion of Cu10Ni alloy in sulfide polluted salt water |
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| Authors: | Nageh K. Allam Elsayed A. Ashour |
| Affiliation: | aDepartment of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA bNational Research Centre, Physical Chemistry Department, Electrochemistry and Corrosion Lab., Dokki, Cairo 12622, Egypt |
| Abstract: | The interaction of benzotriazole (BTAH) with the surface of a corroding copper–nickel alloy in a sulfide polluted salt solution reveals a change in its role from an inhibitor to a promoter of localized corrosion as its concentration changes. A concentration of BTAH ≥5 × 10−4 M inhibits the corrosion reaction in both the polluted and the unpolluted media. On the other hand, a concentration of 10−4 M BTAH promotes the localized corrosion of the alloy in the polluted medium while it acts as an inhibitor in the unpolluted salt solution. This finding is substantiated by measurements of mass loss and current transients and examination of the surface by SEM microscopy. |
| Keywords: | Copper–nickel Alloy Seawater Benzotriazole Inhibitor Promoter Sulfide pollution |
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