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通过腐蚀失重计算、扫描电镜、X射线衍射方法、极化曲线分析等手段,研究了p H值对Q235钢在模拟酸性土壤中腐蚀行为的影响.在模拟酸性土壤环境中,Q235钢的腐蚀速率随土壤p H值升高而降低,经360 h腐蚀后,在p H值为4.0、4.5和5.1的土壤中试样的腐蚀速率分别为0.68、0.48和0.42 mm·a-1.随土壤p H值升高,Q235钢锈层更为致密,其表面蚀坑由窄深型发展变为宽浅型发展.腐蚀产物均为Si O2、α-Fe OOH、γ-Fe OOH、Fe2O3及Fe3O4,随土壤p H值升高,腐蚀产物中α-Fe OOH/γ-Fe OOH质量比升高.极化曲线分析表明,随土壤p H值升高,Q235钢腐蚀电位升高,自腐蚀电流密度降低,试样腐蚀速率减小.
The effect of p H on the corrosion behavior of Q235 steel in simulated acidic soils was investigated by means of corrosion weight loss, scanning electron microscopy, X-ray diffraction and polarization curve analysis. In the simulated acid soil environment, the corrosion rate of Q235 steel The corrosion rate of soil samples with p H of 4.0, 4.5 and 5.1 was 0.68, 0.48 and 0.42 mm · a-1 respectively after 360 h of corrosion, The value of H increases, the rust layer of Q235 steel is denser, and the surface pits develop from narrow and deep to shallow and shallow.The corrosion products are Si O2, α-Fe OOH, γ-Fe OOH, Fe2O3 and Fe3O4, The mass ratio of α-Fe OOH / γ-Fe OOH in the corrosion products increased with the increase of p H, and the polarization curve analysis showed that the corrosion potential of Q235 steel increased with the increase of soil pH, and the corrosion current density Decrease, sample corrosion rate decreases.