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仔细分析推导了在孔内欧姆电位降的影响下孔蚀发展初期的动力学规律。孔蚀电流强度Ⅰ,半径r和电流密度i_p分别与时间的b次方、b_r次方和b_i次方成正比,b的取值范围是0.5～2,b_r的取值范围是0.5～1,b_i的取值范围是-0.5～0。不锈钢在氯化镁溶液中表面被划破后。划痕上形成许多半球状蚀孔,这些蚀孔的大小基本相同。在初期阶段孔蚀电流强度与时间的b次方成正比,b值的大小与理论推算出的该体系的b值符合较好。此外,上述理论推导的结果也能解释许多文献中有关的试验结果。这表明,欧姆电位降是影响孔蚀发展初期动力学规律的一项重要因素。
Carefully analyzed and deduced in the hole ohmic potential drop under the influence of the early development of pitting dynamics. Pitting current intensity Ⅰ, radius r and current density i_p are respectively proportional to time b, b_r and b_i, b is in the range of 0.5 ~ 2, b_r is in the range of 0.5 ~ 1, The range of b_i is -0.5 ~ 0. Stainless steel in magnesium chloride solution after the surface is scratched. Scratches to form many hemispherical etching holes, the size of these holes are basically the same. In the early stage, the intensity of the pitting current is proportional to the b-th power of time, and the value of b is in good agreement with the theoretical b value of the system. In addition, the results derived from the above theories can also explain the relevant experimental results in many literatures. This shows that the ohmic potential drop is an important factor affecting the dynamics of the initial pitting development.