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用埋片和电化学方法研究Q345钢在抚顺市5个选定地区的土壤饱和溶液中腐蚀行为.结果表明,Q345钢在5种土壤饱和溶液中的腐蚀速率不同:腐蚀速率由大到小依次排列为李石区>露天矿区>望花区>东洲区>高尔山区,其中腐蚀最严重的是李石农田区,腐蚀速率为0.0564 mm/a,约为高尔山区的7倍;电化学实验表明,在东洲区和高尔山区土壤中Q345钢表面能够生成保护性的氧化膜,膜层稳定且致密均匀,对基材起到较好的保护作用,年腐蚀速率最低;在露天矿区和望花区土壤中Q345钢能够快速生成氧化膜,但氧化膜分布不均匀且疏松不致密,不稳定,对基材的保护作用较差;在李石区由于土壤的高含盐量和酸性促进吸氧阴极去极化,Q345钢腐蚀腐蚀最严重.
The corrosion behavior of Q345 steel in saturated soils in five selected areas in Fushun City was studied by means of embedded films and electrochemical methods.The results showed that the corrosion rates of Q345 steel in five kinds of soil saturated solutions were different: the corrosion rates were in descending order Lishi area> opencast area> Wanghua area> Dongzhou area> Gaoling area, with the most serious corrosion area being Li Shizi farmland with corrosion rate of 0.0564 mm / a, about 7 times higher than that of Gaoling Mountain area. Electrochemistry Experiments show that the surface of Q345 steel can form a protective oxide film on the surface of Q345 steel in the soil of Dongzhou District and Gaol Mountain. The film is stable and dense and uniform, and has a good protective effect on the substrate with the lowest annual corrosion rate. Q345 steel can quickly form oxide film in the soil of Wanghua area, but the oxide film is unevenly distributed and the porosity is not dense and unstable, which has a poor protective effect on the substrate. Due to the high salinity and acidity of soil, Oxygen cathode depolarization, Q345 steel corrosion and corrosion the most serious.