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。
The pit growth law has been derived in consideration of the ohmic potential drop inside a pit. The changes of the pitting corrosion current, Ⅰ, of the radius of the pit, r, and of the current density inside the pit, i_p, with time, t, can be expressed as Ⅰ∞t~b, r∞t~b_r, i_p∞t~b_i, respectively. The ranges of b, b_r, and b_i are 0.5～2, 0.5～1, -0.5～0. respectively. The pitting corrosion on the scratch scar of stainless steels in chloride solution has been investigated. In the early stage of the pit growth, the pitting current is proportional to tb and values of b fit well with those values calculated theoretically. It can be concluded that the ohmic potential drop is an important factor which has the influence over the pit growth kinetics.
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