通过腐蚀速率测定、腐蚀形貌观察、腐蚀坑深度测量及分形维数计算等方法,研究了杂散电流作用下涂层破损率对Q235、16Mn和X70钢腐蚀的影响.结果表明,杂散电流作用下,Q235钢腐蚀程度最严重,16Mn次之,X70最小;随杂散电流增大和涂层破损率减小,腐蚀速率和腐蚀坑深度均相应增大,腐蚀程度加剧;根据"盒子"维法测定杂散电流腐蚀形貌的分形维数,反映的腐蚀规律与实测腐蚀速率吻合,分形维数可定量表征杂散电流腐蚀形貌.
The effect of stray current on corrosion of Q235,16Mn and X70 pipeline steels was studied by measuring the corrosion ratio, observing the surface, as well as calculating the variation of fractal dimen-sion and corrosion pit depth with the change of the damaged rate of coatings. The results indicated that un-der the stray current disturbance,the degree of corrosion for Q235 was the most serious, 16Mn the next worse and X70 the smallest. As the intensity of stray current increased and the damaged ratio of coating decreased, the corrosion rate increased, the corrosion pit depth became deeper, and corrosion degree was aggravated. The fractal dimensions of the corrosion surface are determined by box-dimension method, which are found to be in agreement with the trend of measured corrosion rates, and in fact, the fractal di-mension could describe the surface morphology of the stray current corrosion of pipeline steels.
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