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碳钢在NaHSO₃和Na₂SO₄溶液中加速腐蚀锈层比较

COMPARISON OF THE RUST LAYERS FORMED ON CARBON STEEL BY ACCELERATED CORROSION TESTING IN NaHSO₃ AND Na₂SO₄ SOLUTIONS

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【Author】 CHEN Hui-ling~(1,2),CHEN Shu-hui~3,WEI Yu~1(1.College of Chemistry and Materials,Hebei Normal University,Shijiazhuang 050016,China;2.College of Fundamental Medicine,Hebei Medical University,Shijiazhuang 050017,China;3.Shanxi Chengcheng County Chengcheng Hight School,Chengcheng 715211,China)

【机构】河北师范大学化学与材料科学学院；陕西省澄城县澄城中学；河北师范大学化学与材料科学学院石家庄050016；河北医科大学基础医学院；石家庄050017；澄城715211；石家庄050016；

【摘要】对碳钢在1.0mmol/L NaHSO3和1.0mmol/L Na2SO4溶液中分别进行周期浸润复合加速腐蚀试验,对其锈层进行红外光谱(IR)和扫描电镜(SEM)分析。各锈层物相组成相似,都含有-γFeOOH、-αFeOOH、Fe3O4和δ-FeOOH或FeSO4.7H2O。NaHSO3溶液中生成的锈层较疏松,颗粒较大,腐蚀速度较快;Na2SO4溶液中生成的锈层致密,腐蚀速度较低。并用Ferrihydrite对形成-γFeOOH和-αFeOOH的促进作用解释了试验结果。更多还原

【Abstract】 Accelerated corrosion tests of immersion-drywet combined cycles in 1.0mmol/L NaHSO₃ solution and 1.0mmol/L Na₂SO₄ solution respectively were performed.Corrosion products were analyzed by IR and SEM.The rusts were composed of γ-FeOOH,α-FeOOH,Fe₃O₄ and δ-FeOOH or FeSO₄·7H₂O.However the rust layer formed NaHSO₃ was loose and corrosion rate was fast,while the rust layer formed in Na₂SO₄ was dense and corrosion rate was slow.Ferrihydrite had an accelerated action in forming γ-FeOOH and αFeOOH.更多还原