Synergistic Inhibition of Corrosion of Carbon Steel by the Ternary Formulations containing Phosphonate, Zn (II) and Ascorbic Acid
Synergistic Inhibition of Corrosion of Carbon Steel by the Ternary Formulations containing Phosphonate, Zn (II) and Ascorbic Acid
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发表时间：
2012
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通讯作者：
Srinivasa Rao
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作者：
Srinivasa Rao
研究了以1-羟基乙烷-1，1-二膦酸（HEDP）和次氮基三（亚甲基膦酸）（NTMP）为膦酸盐的三元缓蚀剂在低氯离子水溶液中对碳钢的缓蚀作用。研究结果表明，环境友好的有机化合物抗坏血酸（AA）是HEDP - Zn 2+和NTMP - Zn 2+二元缓蚀剂配方的优良替代物。重量分析法的研究推断，所需的最低浓度的膦酸盐以及锌离子的良好的腐蚀抑制可以显着降低通过添加抗坏血酸。HEDP - Zn 2+ - AA和NTMP - Zn 2+ - AA的有效抑制所需的最低Zn 2+浓度分别为15 ppm和20 ppm。此外，在两种抑制剂制剂的情况下，更低浓度的Zn 2+足以维持保护膜。pH值对缓蚀效果的影响研究表明，这两种三元缓蚀剂配方在较宽的pH值范围内都能有效地控制腐蚀。HEDP - Zn 2+ - AA在pH 5.0 - 9.0范围内有效，NTMP - Zn 2+ - AA在pH 4.0 - 10.0范围内有效.
Studies on corrosion inhibition of carbon steel in low chloride aqueous environment using ternary inhibitor formulations based on phosphonates namely 1-Hydroxyethane-1,1-diphosphonic acid (HEDP) and Nitrilotris(methylenephosphonic acid) (NTMP) are presented. From these studies, an environmentally friendly organic compound namely ascorbic acid (AA) is proved to be an excellent synergist to the binary inhibitor formulations, HEDP – Zn 2+ and NTMP – Zn 2+ in corrosion control of carbon steel. Gravimetric studies infer that the required minimum concentrations of both the phosphonate as well as zinc ions for good corrosion inhibition could significantly be reduced by the addition of ascorbic acid. The minimum concentration of Zn 2+ required for effective inhibition in case of HEDP – Zn 2+ – AA and NTMP – Zn 2+ – AA are 15 ppm and 20 ppm respectively. Further, still lower concentrations of Zn 2+ are sufficient for the maintenance of the protective film in case of both the inhibitor formulations. Studies on effect of pH on corrosion inhibition indicate that both the ternary inhibitor formulations are effective in corrosion control in wide pH ranges. HEDP – Zn 2+ – AA is effective in the pH range 5.0 to 9.0 and NTMP – Zn 2+ – AA is effective in the pH range 4.0 to 10.0.