低铬铸铁的冲蚀腐蚀磨损机理
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摘要
在自制的冲蚀腐蚀磨损实验装置上测定了低铬铸铁的冲蚀腐蚀磨损性能,并实时测定了冲蚀腐蚀磨损过程中低铬铸铁的极化曲线,分析了其冲蚀腐蚀磨损机理。结果表明,随着浆料pH值的增加,低铬铸铁的腐蚀磨损失重明显减小,pH> 5以后,腐蚀磨损失重的减少变缓慢。在弱酸介质中以析氢腐蚀为主,伴有微弱的吸氧腐蚀。因而表现出在弱酸介质条件下的低铬铸铁的腐蚀磨损失重比中性和弱碱条件下要高。该低铬铸铁的冲蚀腐蚀磨损是电化学腐蚀与固体粒子冲击磨损交互作用的结果。
The erosion-corrosion wear properties of low chromium cast iron were tested on self-made erosion-corrosion wear test device, and the polarization curves of the low chromium cast iron during erosion-corrosion wear were measured in real time. The erosion-corrosion wear mechanism was analyzed. The results show that with the increase of pH value of slurry,the erosion-corrosion wear mass loss of low chromium cast iron decreases obviously. When the pH value of slurry is greater than 5, the erosion-corrosion wear mass loss decreases slowly. In weak acid medium slurry, the corrosion of low chromium cast iron is dominated by hydrogen evolution corrosion, accompanied by weak oxygen absorption corrosion. Therefore, the erosion-corrosion wear mass loss of low chromium cast iron under weak acid medium slurry is higher than that under neutral and weak alkali slurry conditions. The erosion-corrosion wear of low chromium cast iron is the result of interaction between electrochemical corrosion and impact wear of solid particles.
The erosion-corrosion wear properties of low chromium cast iron were tested on self-made erosion-corrosion wear test device, and the polarization curves of the low chromium cast iron during erosion-corrosion wear were measured in real time. The erosion-corrosion wear mechanism was analyzed. The results show that with the increase of pH value of slurry,the erosion-corrosion wear mass loss of low chromium cast iron decreases obviously. When the pH value of slurry is greater than 5, the erosion-corrosion wear mass loss decreases slowly. In weak acid medium slurry, the corrosion of low chromium cast iron is dominated by hydrogen evolution corrosion, accompanied by weak oxygen absorption corrosion. Therefore, the erosion-corrosion wear mass loss of low chromium cast iron under weak acid medium slurry is higher than that under neutral and weak alkali slurry conditions. The erosion-corrosion wear of low chromium cast iron is the result of interaction between electrochemical corrosion and impact wear of solid particles.
引文
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[4]侯锦岭,谢敬佩,王文焱,等.冲蚀角和酸性对含镍低铬铸铁腐蚀磨损的影响[J].铸造技术,2008,29(3):376-379.
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[2]晁建兵,符寒光.低铬铸铁磨球的研究及应用[J].矿冶,2004,13(4):54-58.
[3]尹恩生,樊明涛,张谌.低铬铸铁磨球生产工艺研究及应用[J].新疆钢铁,2016(3):5-9.
[4]侯锦岭,谢敬佩,王文焱,等.冲蚀角和酸性对含镍低铬铸铁腐蚀磨损的影响[J].铸造技术,2008,29(3):376-379.
[5]李秀兰,谢文玲,郭翠霞.高铬铸铁在液-固两相流中的冲蚀磨损行为[J].特种铸造及有色合金,2016,36(10):1027-1030.
[6]李卫,涂小慧,苏俊义,等.湿式研磨铝矿低铬铸铁磨球的失效分析[J].理化检验-物理分册,1999,35(12):554-556.