Influence of Exposure Conditions and Particulate Deposition on Anodized Aluminum Corrosion

I. R. Fontinha, Elsa Eustáquio
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Abstract

Anodizing is commonly used for corrosion protection of aluminum and its alloys in the construction industry. The anodic aluminum oxide (AAO) coating has a high ability to prevent the development of extensive pitting corrosion in aluminum substrates, particularly in marine sites, as was observed during a 10-year atmospheric corrosion study carried out in several marine and industrial sites. However, this study also evidenced that this coating can be highly affected by the deposition of particulate material in industrial polluted environments, sometimes in unexpected ways. This study presents information on the atmospheric corrosion of anodized aluminum exposed at two different chemical industrial complexes: a fertilizer production plant and a pulp and paper mill. Visual assessment of surface changes, pitting depth and mass variation with exposure were determined to quantify the degradation suffered. Additionally, SEM/EDS analyses were carried out on the exposed surfaces. Based on the results obtained, the role played by the deposition of airborne particles present in the two environments with respect to the type and level of damage observed is discussed. Deposits of roasted pyrite ash and phosphates or of wood chips and lime particles enhanced pitting corrosion or caused dissolution of the AAO coating.
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暴露条件和颗粒沉积对阳极氧化铝腐蚀的影响
阳极氧化通常用于建筑工业中铝及其合金的防腐。阳极氧化铝(AAO)涂层具有很高的能力,可以防止铝基板发生广泛的点蚀,特别是在海洋场所,这是在几个海洋和工业场所进行的为期10年的大气腐蚀研究中观察到的。然而,这项研究也证明,在工业污染的环境中,这种涂层会受到颗粒物质沉积的高度影响,有时会以意想不到的方式受到影响。本研究提供了在两个不同的化学工业综合体:一个化肥生产厂和一个纸浆和造纸厂暴露的阳极氧化铝的大气腐蚀的资料。通过对表面变化、点蚀深度和质量随暴露变化的目视评估来量化所遭受的退化。此外,对暴露表面进行了SEM/EDS分析。根据所获得的结果,讨论了两种环境中存在的空气悬浮颗粒沉积对所观察到的损害类型和程度所起的作用。烧过的黄铁矿灰和磷酸盐或木屑和石灰颗粒的沉积增强了点蚀或引起AAO涂层的溶解。
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