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Investigation of corrosion protection afforded by inorganic anticorrosive coatings comprising micaceous iron oxide and zinc dust

机译:研究含云母氧化铁和锌粉的无机防腐涂料提供的腐蚀防护

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摘要

The present study deals with the investigation of the effects of partial replacement of sacrificial zinc dust by high efficiency barrier micaceous iron oxide (MIO) pigments on the corrosion protection behaviour of inorganic zinc rich coatings. To this end, waterborne zinc rich silicate paints based on nanosilica modified potassium silicate were formulated with different contents of zinc and MIO. After being applied on carbon steel panels, the coatings were evaluated by electrochemical impedance spectroscopy, corrosion potential measurements and salt spray test. Replacement of zinc by MIO in the formulation of zinc rich paints was revealed to shorten the duration of cathodic protection stage while on the other hand giving satisfactory results in 1000 h of salt spray test. It was concluded that the incorporation of MIO pigments in conjunction with zinc into the formulation of inorganic zinc rich coatings is a potential means to control the reactivity and the barrier protection stage.
机译:本研究的目的是研究用高效阻隔云母氧化铁(MIO)颜料部分替代牺牲性锌粉对无机富锌涂层的腐蚀防护行为的影响。为此,配制了基于纳米二氧化硅改性的硅酸钾的水性富锌硅酸盐涂料,其中锌和MIO的含量不同。在将其涂覆到碳钢板上之后,通过电化学阻抗谱,腐蚀电势测量和盐雾测试对涂层进行评估。结果表明,在富锌涂料配方中用MIO代替锌可以缩短阴极保护阶段的时间,而另一方面在1000小时的盐雾试验中却能获得令人满意的结果。结论是,将MIO颜料与锌一起掺入富含无机锌的涂料配方中是控制反应性和阻隔保护阶段的潜在手段。

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