| 摘要: |
| 用失重法、动电位极化测试考察不同质量浓度、温度下, 壳聚糖在1 mol/L HCl 溶液中对碳钢的缓蚀作用及机理。结果表明: 随缓蚀剂质量浓度增加, 壳聚糖的缓蚀效率升高,腐蚀速率下降; 温度升高, 腐蚀速率加快, 但缓蚀效率并未下降, 333 K 时缓蚀效率仍可达93.8%; 壳聚糖在金属表面的吸附行为符合Langmuir 吸附等温线, 其与金属表面的相互作用以化学作用为主; 利用动电位极化测试研究碳钢电极在空白及添加缓蚀剂的腐蚀液中的电化学行为及其动力学缓蚀机理, 结果表明: 壳聚糖可有效抑制金属电极的阴极和阳极反应, 缓蚀效率可达91.0%, 自腐蚀电流减至38.6 μA/cm2, 阴极和阳极反应机理未发生改变。 |
| 关键词: 盐酸 缓蚀 失重法 极化 |
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| 基金项目:国家科技支撑计划项目(2007BAB27B01); 中国博士后科学基金项目(20090461269); 山东省博士后自主创新基金(200902040); 中国科学院海洋研究所海洋腐蚀与防护研究发展中心开放基金项目(200901005); 济南大学博士基金项目(XBS0899) |
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| The mechanism and inhibition effect on chitosan for mild steel in 1mol / L HCl |
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| Abstract: |
| We systemically studied the inhibiting effect of chitosan on metal corrosin in 1 mol/L HCl by weight loss and electrochemical measurement. The results of weight loss measurement showed that inhibition efficiency increased and the corrosion rate decreased with the increasing concentration of chitosan, reaching 13.8g/(m2·h) at 333 K, and corrosion rate increased but the inhibitory efficiency did not decrease with the increase of temperature, reaching 93.8% at 333 K. The thermodynamic adsorption behavior of inhibitor on the metal surface fitted well with Langmuir isotherm, the interaction between the inhibitor and the metal surface depended more on the chemical action. The electrochemical behavior was studied by dynamic polarization method. The results showed that the inhibitors suppressed cathodic and anodic process of electrode corrosion, inhibition efficiency reached 91.0%, the corrosion current reached 38.6 μA/cm2, the corrosion potential did not shift obviously, and the cathodic and anodic reaction mechanism did not change. |
| Key words: hydrochloric acid corrosion corrosion inhibitor weight loss polarization |
