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Evaluation of the synergistic erosion-corrosion behaviour of HVOF thermal spray coatings

机译：HVOF热喷涂涂料的协同腐蚀-腐蚀行为评估

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摘要

The present study examines three High Velocity Oxy Fuel deposited coatings, Tungsten Carbide, Chromium Carbide and Aluminium Oxide, under slurry erosion-corrosion conditions. Coatings produced in this manner typically exhibit superior density and hardness over alternative thermal spray technologies, therefore are suitable for use in corrosive and highly erosive environments. The scope of the study concentrates on isolation of the contributing factors of erosion, corrosion and synergy through applied electrochemistry, as well as metallographic analysis to evaluate the mechanisms causing coating degradation. The aim of which is to provide comprehensive data on the performance of the mentioned coatings under erosion-corrosion in conditions representing a flowing environment. Results demonstrate the breakdown of Chromium Carbide and Aluminium Oxide coatings result in enhanced mass loss over the uncoated S355 steel. Despite this, results have shown Tungsten Carbide with a Cobalt binder to be an effective protective coating, resulting in a significant reduction in total material loss over uncoated 5355 steel. (C) 2016 Elsevier B.V. All rights reserved.
机译：本研究在浆液腐蚀腐蚀条件下研究了三种高速含氧燃料沉积涂层，即碳化钨，碳化铬和氧化铝。与其他热喷涂技术相比，以这种方式生产的涂层通常具有更高的密度和硬度，因此适用于腐蚀性和高腐蚀性环境。研究范围集中在通过应用电化学方法分离腐蚀，腐蚀和协同作用的影响因素，以及金相分析以评估引起涂层降解的机理。其目的是提供在代表流动环境的条件下在腐蚀腐蚀下上述涂层性能的综合数据。结果表明，与未涂覆的S355钢相比，碳化铬和氧化铝涂层的破裂导致质量损失增加。尽管如此，结果显示具有钴粘合剂的碳化钨是有效的保护性涂层，与未涂层的5355钢相比，可显着降低总材料损耗。 （C）2016 Elsevier B.V.保留所有权利。

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