海水中小球藻对Q235碳钢腐蚀行为的影响

摘要

The effect of chlorella vulgaris in seawater on corrosion behavior of Q235 carbon steel was investigated by means of surface analysis techniques and electrochemical measurement method.The results show that the Q235 carbon steel uniformly corroded in culture medium without chlorella vulgaris,but localized corrosion occurred in culture medium with chlorella vulgaris.The open circuit potential showed a periodic oscillation with the change of immersion time in culture medium with chlorella vulgaris.The chlorella vulgaris and its metabolite could adhere to steel surface and form a biofilm which could effectively restrain metallic corrosion.Meanwhile,the oxygen produced by photosynthesis of chlorella vulgaris can cause cathodic oxygen depolarization reaction,which accelerated the corrosion of metal.%采用表面分析技术以及电化学测试技术研究了海水中小球藻对Q235碳钢腐蚀的影响.结果表明:在不含小球藻培养液中Q235碳钢发生均匀腐蚀,而在含小球藻培养液中碳钢发生不均匀腐蚀;在含小球藻体系中,开路电位随浸泡时间的变化呈周期振荡;小球藻及其代谢产物能够在材料表面附着并形成一层生物膜,减缓金属的腐蚀;小球藻光合作用产生的氧导致阴极氧去极化作用,加速了金属的腐蚀.