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Abstract In this paper,a method was proposed to determine the critical pitting potential(φcb)which is obtained by extrapolating the curve of 1/φvsφ to 1/τ=0.A formula,φL=φ_(ε,o)+η_(co),was then derived to calculate the limit free corrosion potentials(φ)of practical passive systems. Finally,the boundary condition for prevention of practical passive sys- tems from pitting initiation was established.That is,if φ_(cb)>φfor a practical passive system,it is impossible for pitting nuclei to oc cur in the system,on the contrary,it is possible if φ_(cb)<φ■.
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Received: 25 February 1989
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