镀锌板在不同加速腐蚀环境下的腐蚀行为研究

发布时间：2018-03-14 12:53

本文选题：镀锌板　切入点：加速腐蚀试验　出处：《表面技术》2017年08期 　论文类型：期刊论文

【摘要】：目的研究中性盐雾环境、中性盐雾加周浸环境和中性盐雾加湿热环境下镀锌板的腐蚀行为,明确不同加速腐蚀试验环境对镀锌板腐蚀行为的影响。方法对镀锌板进行中性盐雾、中性盐雾加周浸、中性盐雾加湿热等不同类型的加速腐蚀试验,通过失重法、SEM、XRD以及极化曲线等方法,对比不同加速腐蚀试验类型对镀锌板腐蚀行为的影响。结果在三种加速腐蚀试验环境下,镀锌板的腐蚀过程基本相同:镀锌层及白色锌锈腐蚀、锌层破裂、锌层完全脱落、基体碳钢腐蚀。腐蚀产物都以Zn(OH)_2、γ-FeOOH、ZnO、Fe_2O_3等为主。三种环境下镀锌板的腐蚀都不均匀,不同位置的腐蚀情况存在一定差异。其中,中性盐雾环境下材料腐蚀情况最为严重,中性盐雾加周浸环境次之,中性盐雾加湿热环境下最轻。结论三种加速环境都是主要通过Cl~-在锌表面的沉降和溶解作用增强介质的导电性能,加剧锌层的腐蚀。在中性盐雾环境中,Cl~-浓度最高,试样腐蚀最严重。在中性盐雾加周浸环境中,SO_4~(2-)与Cl~-协同作用,腐蚀也较严重。而中性盐雾加湿热环境中,Cl~-被稀释,腐蚀情况最轻微。
[Abstract]:Objective to study the corrosion behavior of galvanized sheet in neutral salt spray environment, neutral salt spray plus weekly immersion environment and neutral salt spray plus humid and hot environment, and to determine the effect of different accelerated corrosion test environment on corrosion behavior of galvanized sheet. Methods Neutral salt spray was carried out on galvanized plate. The accelerated corrosion tests of different types, such as neutral salt spray plus weekly immersion, neutral salt spray and damp heat, were carried out by means of weight loss method, SEMU XRD and polarization curve. Results under three accelerated corrosion test conditions, the corrosion process of galvanized sheet was basically the same: galvanizing layer and white zinc rust corrosion, zinc layer cracking, zinc layer completely falling off. Corrosion of matrix carbon steel. The corrosion products are ZnOOH2, 纬 -FeOOHO, ZnOO / Fe2O3 and so on. The corrosion of galvanized steel is uneven in the three environments, and the corrosion situation is different in different positions. The corrosion of materials in neutral salt fog environment is the most serious. Neutral salt spray plus ambient immersion was the second, and neutral salt spray was the lightest in humid and hot environment. Conclusion all three accelerated environments enhance the electrical conductivity of the medium mainly through the deposition and dissolution of Cl-on zinc surface. The corrosion of zinc layer is aggravated. In the neutral salt spray environment, the highest concentration of Cl- and the most serious corrosion of the sample. In the environment of neutral salt spray plus circumferential immersion, the corrosion is also more serious. In the environment of neutral salt spray and ambient immersion, the corrosion is also more serious, while in the neutral salt mist and humid and hot environment, the corrosion is also more serious. Corrosion is minimal.
【作者单位】：西南技术工程研究所;北京科技大学腐蚀与防护中心;北京科技大学腐蚀与防护教育部重点实验室;
【分类号】：TG174.3

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