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采用室内、室内+冰冻和户外三种不同环境的曝晒实验,研究了冰冻/解冻循环对两种耐候钢初期大气腐蚀行为的影响.利用失重实验和电化学方法评价了实验钢的耐腐蚀性能,用扫描电镜观察了锈层形貌,用能谱分析仪分析了合金元素在锈层中的分布.结果表明:低温、低湿环境促进致密锈层的形成,而温度、湿度较高的环境中形成的锈层致密度较低;冰冻/解冻循环导致非致密锈层内产生裂纹,其原因是疏松锈层中的孔洞中含有大量液态水,在液固相变时产生较大的应力,致使锈层开裂.致密锈层不含液态水,基本不受其影响.
The effects of freezing / thawing cycles on the initial atmospheric corrosion of two kinds of weathering steels were studied by exposure experiments in indoor, indoor + freezing and outdoors.The corrosion resistance of experimental steels was evaluated by weight loss test and electrochemical method, The morphology of the rust layer was observed by SEM, and the distribution of the alloying elements in the rust layer was analyzed by energy spectrum analyzer.The results show that the formation of the dense rust layer is promoted by the low temperature and low humidity environment, and the formation of the rust layer is formed under the environment of high temperature and humidity Of the rust layer density is low; freeze / thaw cycles lead to cracks in the non-dense rust layer, the reason is that loose holes in the rust layer contains a lot of liquid water, liquid-solid phase change greater stress, resulting in rust Layer cracking. The dense rust layer does not contain liquid water and is basically unaffected by it.