黄铁矿在不同pH值硫酸钠溶液中的电化学腐蚀研究
Electrochemical Corrosion of Pyrite in Sodium Sulfate Solutions with Different pH
查看参考文献15篇
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文摘
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溶液的pH值对黄铁矿的电化学腐蚀行为有着重要的影响.本文运用开路电位测量、Tafel扫描、循环伏安扫描以及电化学阻抗谱等电化学测试技术,研究黄铁矿在pH值分别为2.0、6.5、11.0的0.1 mol/L Na_2SO_4溶液中的电化学腐蚀行为.结果表明:溶液中pH值升高时,黄铁矿的开路电位降低,腐蚀电流升高,阻抗谱中圆弧半径减小,这些变化说明了黄铁矿变得更加容易被腐蚀.分析其原因为当溶液中pH值升高时,黄铁矿氧化过程产生的中间产物S_2O_3~(2-)变得比较稳定,因此,由其分解产生的单质硫的量减少,继而因单质硫在黄铁矿表面吸附造成的钝化作用也随之减弱,黄铁矿的腐蚀速率增加. |
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其他语种文摘
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The pH values of the solution is an important factor that affects the electrochemical corrosion of pyrite.In this research,electrochemical techniques,such as open circuit potential measurement,tafel sweep,cyclic linear sweep voltammetry and electrochemical impedance spectroscopy,were employed to study the electrochemical behaviors of pyrite in 0.1mol/L Na_2SO_4 solutions under different pH values of 2.0,6.5and 11.0.The open circuit potential of pyrite dropped,the corrosion current raised,and the radius of the loop in electrochemical impedance spectroscopy decreased when solution pH values increased,indicating that pyrite was easily corroded in a higher pH values solution.The higher is the pH values of the solution the more stable is the intermediate product S_2O_3~(2-) during pyrite corrosion,and the less is the elemental sulfur originated from S_2O_3~(2-) decomposition,such the passivation of pyrite by the adsorption of elemental sulfur is weakened and the corrosion rate of pyrite is increased. |
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来源
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矿物岩石地球化学通报
,2014,33(4):526-530 【核心库】
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DOI
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10.3969/j.issn.1007-2802.2014.04.016
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关键词
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黄铁矿
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知识脉络
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腐蚀
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知识脉络
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电化学
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知识脉络
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pH值
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知识脉络
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地址
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中国科学院地球化学研究所, 中国科学院地球内部物质高温高压实验室, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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金属学与金属工艺 |
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基金
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中国科学院重大科研设备研制项目
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国家863计划
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文献收藏号
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CSCD:5229980
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参考文献 共
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