基于分形的管线钢直流杂散电流腐蚀行为
DC Stray Current Corrosion Behavior of Pipeline Steel Based on Fractal Theory
摘 要
基于非线性科学中的分形理论, 研究了Q235管线钢直流杂散电流的腐蚀行为。采用腐蚀挂片失重法和计盒维数法研究了杂散电流密度、土壤电导率和土壤酸碱度对腐蚀速率和分形维数的影响, 并重点研究了腐蚀形貌的分形特征及腐蚀速率与分形维数的相互关系。结果表明, Q235管线钢杂散电流腐蚀形貌具有分形特征, 分形维数与腐蚀速率成近似指数关系, 据此可对Q235管线钢腐蚀程度作出定量评价; 杂散电流密度对分形维数和腐蚀速率影响最大, 分形维数随着杂散电流密度增加呈指数增大, 随着土壤电导率增大和pH降低呈现出微小增加趋势。
直流杂散电流
分形维数
腐蚀速率
Q235 pipeline steel
DC stray current
fractal dimension
corrosion rate
Abstract
The influence of DC stray current, soil conductivity and pH on the corrosion behaviors of Q235 pipeline steel was investigated based on the fractal theory of nonlinear science. The corrosion rate and fractal dimension of corrosion morphology were tested using corrosion coupon weight loss and box dimension methods, respectively. The focus is on the relationship between corrosion rate and fractal dimension. It is found that the DC stray current corrosion morphology of Q235 steel has fractal characteristics and the fractal dimension has exponential relation with corrosion rate. Stray current density has obvious effect on the corrosion behavior of Q235 pipeline steel. The fractal dimension shows exponential increase with the increase of stray current density, while it increases slightly with the increase of soil conductivity and the decrease of pH.
中图分类号 TG172.48
所属栏目 试验研究
基金项目 国家863计划(2012AA040105)
收稿日期 2013/5/16
修改稿日期
网络出版日期
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备注王力伟(1984-), 助理研究员, 博士后, 从事油气管道腐蚀与检测研究,
引用该论文: WANG Li-wei,TANG Xing-hua,WANG Xin-hua,LIU Ju-yin,WANG Cui,HE Ren-yang. DC Stray Current Corrosion Behavior of Pipeline Steel Based on Fractal Theory[J]. Corrosion & Protection, 2014, 35(3): 218
被引情况:
【1】杨超,张成斌,李自力,赵雅蕾,崔淦,丁小勇, "直流杂散电流对X65钢腐蚀行为的影响",腐蚀与防护 37, 873-875(2016)
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参考文献
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【2】BRICHAU F,DECONINCK J,DRIESENS T. Modeling of underground cathodic protection stray currents[J]. Corrosion,1996,52:480-488.
【3】SCHWAIM L H,SANDOR J G. Stray current the major cause of underground plant corrosion[J]. Materials Perform,1969,6:31-36.
【4】BERTOLINI L,CARSANA M,PEDEFERRI P L,et al. Corrosion behavior of steel in concrete in the presence of stray current[J]. Corrosion Science,2007,49:1056-1068.
【5】MANDELBROT B B,PASSOJA D E,PAULLY A J. Fractal character of fracture surfaces of metals[J]. Nature,1984,308:721-722.
【6】KUROSE M,HIROSE Y,SASAKI T,et al. Fractal characteristics of stress corrosion cracking in sncm 439 steel having different prior-austenite grain sizes[J]. Engineer Fracture Mechanics,1996,53(2):279-288.
【7】NIRUPARM S,CHAUDHURI B B. Multifractal and generalized dimensions of gray-tone digital images[J]. Signal Processing,1995,42:181.
【8】XU S J,WENG Y J. A new approach to estimate fractal dimensions of corrosion images[J]. Pattern Recognition Letters,2006,27:1942-1947.
【9】陈建安. 分形维数的定义与测定方法[J]. 电子科技,1999,2(20):44-46.
【10】SAONMA V E,BARTON C. Fractal fracture and size of effects in concretes[J]. Journal of Engineering Mechanics,1994,120(4):835-854.
【11】AOYAMA M,SHIBATA Y. Evaluation of corrosion on cast Iron surfaces by fractal dimension analysis[J]. International Journal of Materials and Product Technology,2001,42(1):403-408.
【12】毕新民,曹楚南. pH值和氯离子浓度对铁在酸溶液中的腐蚀电化学行为的影响[J]. 中国腐蚀与防护学报,1983,3(4):199.
【13】梁平,李晓刚,杜翠薇,等. 影响埋地X70管线钢腐蚀性的土壤因素评价[J]. 腐蚀与防护,2009,30(8):526-530.
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