pH值对Q235钢在模拟土壤中腐蚀行为的影响

doi:10.11902/1005.4537.2015.049

中国腐蚀与防护学报

2016, Vol. 36

Issue (1): 31-38 DOI: 10.11902/1005.4537.2015.049

本期目录 | 过刊浏览

pH值对Q235钢在模拟土壤中腐蚀行为的影响

黄涛¹,陈小平¹(

),王向东¹,米丰毅¹,刘芮²,李向阳¹

1. 钢铁研究总院工程用钢研究所北京 100081
2. 昆明理工大学材料科学与工程学院昆明 650093

Effect of pH Value on Corrosion Behavior of Q235 Steel in an Artificial Soil

Tao HUANG¹,Xiaoping CHEN¹(

),Xiangdong WANG¹,Fengyi MI¹,Rui LIU²,Xiangyang LI¹

1. Division of Engineering Steel,Central Iron and Steel Research Institute, Beijing 100081, China
2. School of Material Science and Engineering, Kunming University of Science and Technology,Kunming 650093, China

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摘要:

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pH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pH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-FeOOH,Fe₃O₄,γ-FeOOH和Fe₂O₃,但α-FeOOH和Fe₃O₄含量差别大,碱性条件下腐蚀产物中Fe₃O₄的含量上升,α-FeOOH的含量下降.

关键词 ：土壤腐蚀, 模拟土壤, Q235钢, pH值

Abstract：

Coupons of the grounding material Q235 steel were buried in an artificial soil of diatomite with different pH values for 20 d, and then the corrosion behavior of the steel was examined. The results indicated that the pH value of the artificial soil had a great effect on the corrosion behavior of Q235 steel. With the increasing of pH value, the corrosion rate of the steel in the artificial soil decreased, which accorded fairly well with that in the actual soil, correspondingly the corrosion type of the coupons turned from rather serious uniform corrosion to slight local corrosion. The corrosion products formed in acidic artificial soil are consistent with those in an alkaline artificial soil, they all composed mainly of α-FeOOH, Fe₃O₄, γ-FeOOH and Fe₂O₃, however the products in the late case contained higher Fe₃O₄ and less α-FeOOH.

Key words： soil corrosion artificial soil Q235 steel pH value

基金资助:陕西电力科学研究院项目 (2012037) 资助

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引用本文:

黄涛,陈小平,王向东,米丰毅,刘芮,李向阳. pH值对Q235钢在模拟土壤中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(1): 31-38.
Tao HUANG, Xiaoping CHEN, Xiangdong WANG, Fengyi MI, Rui LIU, Xiangyang LI. Effect of pH Value on Corrosion Behavior of Q235 Steel in an Artificial Soil. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 31-38.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.049 或 https://www.jcscp.org/CN/Y2016/V36/I1/31

图1 Q235钢在不同pH值的模拟土壤条件下腐蚀不同时间的腐蚀宏观形貌

图2 Q235 钢在不同pH值的模拟土壤条件下的SEM像

图3 Q235钢在不同pH值条件下腐蚀产物的EDS结果

表1 Q235钢在不同pH值的模拟土壤条件下的腐蚀产物覆盖率,腐蚀失重和最大蚀孔深

图4 Q235钢在不同pH值的模拟土壤条件下腐蚀产物的XRD谱

图5 Q235钢在不同pH值的模拟土壤条件下各腐蚀产物的相对含量

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