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采用一种新型的土壤腐蚀评价方法——硅藻土模拟土壤实验室加速腐蚀法,进行了Q235钢在不同p H值模拟土壤腐蚀介质中的埋片20 d的腐蚀实验。结果表明:随着模拟土壤的p H值从4.5升高至8.5,Q235钢的腐蚀速率持续下降,这一规律与已有的实际土壤下的腐蚀规律相同,而试样表面由较严重的全面腐蚀转变为轻微的局部腐蚀;酸性模拟土壤条件与碱性条件下的腐蚀产物组成一致,主要是α-Fe OOH,Fe3O4,γ-Fe OOH和Fe2O3,但α-Fe OOH和Fe3O4含量差别大,碱性条件下腐蚀产物中Fe3O4的含量上升,α-Fe OOH的含量下降。
A new type of soil erosion evaluation method - diatomite simulated soil laboratory accelerated corrosion method was used to investigate the corrosion behavior of Q235 steel for 20 days in simulated soil erosion media with different p H values. The results show that the corrosion rate of Q235 steel decreases continuously with increasing p H of simulated soil from 4.5 to 8.5, which is the same as that of the existing soil. However, The corrosion was changed to a slight local corrosion. The acid simulated soil consisted of the corrosion products under alkaline conditions, mainly α-Fe OOH, Fe3O4, γ-Fe OOH and Fe2O3, but the contents of α-Fe OOH and Fe3O4 were different, Under alkaline conditions, the content of Fe3O4 in the corrosion products increased and the content of α-Fe OOH decreased.