The corrosion behaviour of mild steel in 3·5%NaCl solutions at pH 6 with initial dissolved oxygen contents of 6·5 ppm, containing 0·5, 1·1, or 2·7 mmol L−1 additions of the silane coupling agent 3-(trimethoxysilyl)propanethiol-(1), has been studied at 25°C. Electrochemical polarisation tests, weight loss measurements, and surface analyses of the corrosion layers were carried out. It was found that the coupling agent, which is known to be an adhesion promoter, acts by inhibiting anodic and cathodic processes, providing reductions in corrosion rate of up to 60%.
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