Mao Xiaofei Liu Xuanyi Liu Shuaiqi Xu Yuanyuan Huang Shifu Dong Xuefeng He Hualin Liu Guangming *.Effect of CTAB on the corrosion behavior of SA210C steel in an acidic environment[J].Plating & Finishing,2024,(11):9-16.
CTAB对SA210C钢在酸性环境中腐蚀电化学行为的影响
- Title:
- Effect of CTAB on the corrosion behavior of SA210C steel in an acidic environment
- Keywords:
- SA210C steel ; cetyltrimethylammonium bromide CTAB ; corrosion inhibitor ; acidic environment ; electrochemical test ; corrosion
- 分类号:
- TG172
- 文献标志码:
- A
- 摘要:
- 针对不同浓度十六烷基三甲基溴化铵( CTAB )对 SA210C 钢在两种酸性模拟溶液中的缓蚀效果,采用动电位扫描曲线与电化学阻抗谱( EIS )方法分析了不同条件下 SA210C 钢电化学腐蚀特征,计算了不同浓度缓蚀剂的缓蚀效率( IE , % ),研究了 pH 值和缓蚀剂对腐蚀速率的影响。结果表明:未添加缓蚀剂时, SA210C 钢在 pH=6.5 模拟溶液中自腐蚀电位较在 pH=5.5 溶液中更正,但腐蚀电流密度有所下降;添加缓蚀剂后, SA210C 钢在相同 pH 值下自腐蚀电位和腐蚀电流密度均呈现先减小后增大趋势,缓蚀剂添加量为 60 mg/L 时缓蚀效率达到最高值 75.60% 。 pH 值降低时, SA210C 钢容抗弧半径减小,减小趋势与规律同极化曲线所得规律一致。因此,未添加缓蚀剂时, SA210C 钢在酸性环境中表现为活性溶解状态;与 pH=5.5 溶液相比, SA210C 钢在 pH=6.5 溶液中腐蚀倾向高但腐蚀速率较缓慢。随着 CTAB 添加量的增加,其对 SA210C 钢在酸性环境中的缓蚀效果呈现先增大后减小趋势,缓蚀剂浓度为 60 mg/L 时有最佳缓蚀效果,继续添加至 80 mg/L 后,缓蚀效果显著下降。
- Abstract:
- : This work investigates the corrosion inhibition effect of different concentrations of cetyltrimethylammonium bromide ( CTAB ) on SA210C steel in two acidic simulated solutions. The electrochemical corrosion characteristics of SA210C steel under different conditions were analyzed by potentiodynamic polarization ( PDP ) curves and electrochemical impedance spectroscopy ( EIS ), and the corrosion inhibition efficiencies were calculated for different concentrations of corrosion inhibitors , and the effects of pH and corrosion inhibitor on corrosion rate were also analyzed. It was found that when no corrosion inhibitor was added , the self-corrosion potential of SA210C steel in the simulated solution at pH 6.5 was more positive than that in the solution at pH 5.5 , but the corrosion current density decreased. After the addition of a corrosion inhibitor , the self-corrosion potential and the corrosion current density of SA210C steel showed a trend of decreasing and then increasing under the same pH. The corrosion inhibition efficiency reached a maximum of 75.60% with the addition of an inhibitor of 60 mg/L. The corrosion inhibition efficiency ( IE , % ) of different concentrations of corrosion inhibitors was calculated , and the analysis of the effect of pH and inhibitor on the corrosion rate was also conducted , resulting in 75.60%. As the pH value decreases , the arc radius capacity of the SA210C steel decreases , showing a decreasing trend and following the same law as the polarization curve obtained. The results show that when no corrosion inhibitor is added , SA210C steel exhibits an active dissolution state in an acidic environment. Compared to a solution of pH5.5 , corrosion tendency of SA210C steel is high in a solution of pH6.5 , but the corrosion rate is slow. With the increase of CTAB additive amount , its corrosion inhibition effect on SA210C steel in an acidic environment showed a trend of increasing and then decreasing. The corrosion inhibitor concentration of 60 mg/L has the best corrosion inhibition effect , and continues to decrease significantly when added to 80 mg/L.
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备注/Memo
收稿日期: 2024-01-05 修回日期: 2024-01-21 作者简介: 毛晓飞( 1978 —),男,硕士,高级工程师, email : maogun2004@163.com. * 通信作者: 刘光明, email : gemliu@162.com. 基金项目: 国家自然科学基金项目( 51961028 ) . CTAB 对 SA210C 钢在酸性环境中腐蚀电化学行为的影响