In order to promote the effective and efficient application of corrosion-resistant metals and alloys in mineral-processing environments, the Bureau of Mines has characterized the effect of aggressive ions on the corrosion and passive behavior of two stainless steels, Fe18Cr and AISI 430 SS. Samples prepassivated in oxygen saturated 1n H2SO4 at 0.6 V normal hydrogen electrode and then released to open circuit and aged for times ranging from 10 to 80,000 min (55 days) were subsequently exposed to chloride ion concentrations ranging from 5 to 44 parts per thousand. Susceptibility to chloride ion attack was determined as a function of time in solution, chloride ion concentrations, and open circuit potentials at the time chloride was added by measuring the amount of time required for a sample to begin corroding after adding the chloride ion.
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