Environmental Cracking Susceptibility of AISI 422 Stainless Steel in NH4HCO3/NH4OH Solution at 70°C

Scully, John R.; Scully, H. S.

doi:10.5006/1.3299214

Cited by 2 publications

(1 citation statement)

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“…bridges, buildings, highways and pipelines), since its adoption in the mid 20s. Owing to economic and safety reasons, a careful survey is required in order to prevent corrosion problems [1][2][3][4][5][6][7]. The corrosion of prestressed steel in concrete has become a major technological problem.…”

Section: Introductionmentioning

confidence: 99%

A voltammetric study on the corrosion of prestressed steel in saturated Ca(OH)2 solution containing chloride ions

et al. 2009

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An electrochemical study of prestressed steel in saturated Ca(OH) 2 aqueous solutions (pH 12) was carried out in the absence and in the presence of chloride ions, in such a concentration that simulates the composition of seawater. Cyclic voltammetry, linear sweep voltammetry, open circuit potential transients, atomic absorption spectroscopy and scanning electron microscopy coupled to electron diffraction spectroscopy were employed. The linear polarisation curves analysis led to the determination of polarisation resistance, R p , corrosion potential, E corr , corrosion current density, j corr , Tafel slopes, breakdown potential, E b and repassivation potential E repass . A linear dependence of the breakdown potential, E b , on the square root of scan rate was obtained, according to the Point Defect Model (PDM). A crossover characteristic of the nucleation processes was observed in the presence of chloride ions. SEM/EDS studies revealed, as expected, a strong influence of the presence of chloride ions observed in the transpassive and the active regions. In conclusion, chloride ions contribute to enhance the corrosion of steel, most probably due to their adsorption on both the active and the passive electrode surfaces.

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Section: Introductionmentioning

confidence: 99%