SYNERGISTIC EFFECT OF CHLORIDE AND SULPHUR-BEARING POLLUTANT IN ATMOSPHERIC CORSOSION OF MILD STEEL

J Chin Soc Corr Pro

1996, Vol. 16

Issue (4): 303-306 DOI:

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SYNERGISTIC EFFECT OF CHLORIDE AND SULPHUR-BEARING POLLUTANT IN ATMOSPHERIC CORSOSION OF MILD STEEL

CAI Jianping; ZHENG Yiping; LIU Shourong (Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences)

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Abstract Immersion-wet-dry combined cyclic test was applied to study the synergistic effect of chloride and sulphur-bearing pollutant in atmospheric corrosion of mild steel. The experimental data were analysed and could be formulated by W = K. tn. Morphology of rust was observed by SEM and elemental distribution in rust was analysed by XPS. Results showed that the interaction between Cl- and HSO3 was rather complicated. At the beginning of corrosion, round blisters appeared on the rust and elemental contents inside and outside the blister were different. Synergistic effect of Cl- and HSO3 was significant. As corrosion went cn, the blisters dissapeared, the rust became compact, and the synergistic effect diminished.A mechanism for the synergistic effect was suggested.

Key words: Atmospheric corrosion Chloride Sulphur-bearing pollutant Simulation experiment Synergistic effect

Received: 25 August 1996

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CAI Jianping; ZHENG Yiping; LIU Shourong (Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences). SYNERGISTIC EFFECT OF CHLORIDE AND SULPHUR-BEARING POLLUTANT IN ATMOSPHERIC CORSOSION OF MILD STEEL. J Chin Soc Corr Pro, 1996, 16(4): 303-306.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I4/303

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