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Abstract 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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Received: 25 April 1987
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