The use of doped polyaniline as an electrode in the galvanic anodic protection of ferrous metals in industrial acid solutions |
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| Authors: | J Hu S Xiao L Zhong H Zhu F Gan |
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| Affiliation: | 1. College of Resource and Environmental Science of Wuhan University, Wuhan 430072 (P. R. China);2. College of Resource and Environmental Science of Wuhan University, Wuhan 430072 (P. R. China)
State Key Laboratory for Corrosion and Protection of Metals, Shenyang 110015 (P. R. China) |
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| Abstract: | In order to investigate the galvanic anodic protection (GAP) of ferrous metals (such as 410, 304 and 316 stainless steels) in acid solutions by doped polyaniline (PANi), separate doped PANi powder-pressed electrodes with different surface areas (the area ratio of the PANi electrode to stainless steel is between 1:1 and 1:2) have been prepared. These were coupled with ferrous metal in the following solutions: 5 M sulphuric acid, 5 M phosphoric acid and industrial phosphoric acid (containing 5 M phosphoric acid and 0.05% chloride ion) to construct a galvanic cell, in which PANi is cathode while ferrous metal is anode. The results indicate that a PANi electrode with sufficient area can provide corrosion protection to stainless steel in these acidic solutions. A pilot scale coupling experiment was carried out. The results indicate that PANi is a promising material as an electrode for the anodic protection of ferrous metals in acidic solutions in industrial situations. |
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