pH值对Q235钢在模拟酸性土壤中腐蚀行为的影响

发布时间：2018-05-04 06:23

本文选题：钢腐蚀 + 土壤　；参考：《工程科学学报》2015年04期

【摘要】：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.
[Abstract]:The effect of pH value on corrosion behavior of Q235 steel in simulated acid soil was studied by means of corrosion weightlessness calculation, scanning electron microscope X-ray diffraction and polarization curve analysis. The corrosion rate of Q235 steel decreased with the increase of pH value in simulated acidic soil environment. After 360 h corrosion, the corrosion rates were 0.680.48 and 0.42 ma-1 in soils with pH values of 4.0 ~ 4.5 and 5.1, respectively. With the increase of pH value of soil, the rust layer of Q235 steel is denser, and the surface corrosion pit develops from narrow type to wide and shallow type. The corrosion products were Sio _ 2, 伪 -Fe O _ H, 纬 -Fe O O _ H _ 2O _ 3 and Fe _ 3O _ 4. The mass ratio of 伪 -Fe OOH/ 纬 -Fe OOH in the corrosion products increased with the increase of pH value in the soil. The analysis of polarization curve shows that the corrosion potential of Q235 steel increases with the increase of pH value, the corrosion current density decreases and the corrosion rate decreases.
【作者单位】：钢铁研究总院工程用钢研究所;北京科技大学腐蚀与防护中心;
【基金】：国网陕西省电力公司电力科学研究院项目(2012037)
【分类号】：TG172.4

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