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When Manganese sulphides are present in steel, pitting occurs in chloride containing solutions. The addition of Ti as an alloying agent prevents the MnS formation. Pit initiation was investigated. In low chloride solutions pits initiate on Ti nitrides but on Ti sulphides for more concentrated solutions. The pitting potential pH dependence is the signature of the type of inclusions which act as pitting sites. The anodic current fluctuations occurring during a potentiostatic polarization below the pitting potential were studied in detail as a function of the polarization potential, the solution chloride content and pH. Prior ageing in the test solution, either at rest potential or at some potentials ranging below the pitting potential, was found to improve the pitting resistance.

Additional information

Authors: BAROUX B, Ugine Savoie, Ugine (FR);DURET THUAL C, IRSID Unieux (FR);COMBRADE P, IRSID Unieux (FR)
Bibliographic Reference: EUR 18632 EN/FR (1999) 93pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5052-8
Record Number: 199910653 / Last updated on: 1999-04-26
Original language: en
Available languages: en
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