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首页> 外文会议>International Thermal Spray Conference Exposition >Effect of angle of impingement on erosion-corrosion behaviour of a WC-Co-Cr HVOF sprayed coating
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Effect of angle of impingement on erosion-corrosion behaviour of a WC-Co-Cr HVOF sprayed coating

机译：冲击角度对WC-CO-CR HVOF喷涂涂层腐蚀行为的影响

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摘要

This paper describes an investigation of the influence of impingement angle of a solid/liquid jet upon the erosion-corrosion behaviour of a tungsten carbide-cobalt-chromium thermal sprayed coating. The coating type investigated was a nominal WC-10%Co-4%Cr material, HVOF-sprayed onto a stainless steel substrate. This coating was subjected to a submerged impinging jet at 12 m/s of 3.5% NaCl solution containing various concentrations of suspended sand particles at 18°C. The angles of impingement employed were 30, 45, 60, 75 and 90 degrees and the measured total weight losses exhibited a significant influence of impingement angle with reduced material losses at more oblique angles of jet impact. The implementation of cathodic protection to the specimens enabled the pure mechanical component of the overall erosion-corrosion damage to be determined and this was also found to be dependent upon the angle of impingement of the liquid/solid stream. In contrast, the pure corrosion component (determined from in-situ electrochemical monitoring) exhibited no systematic trends with impingement angle. The findings are discussed in terms of the detailed erosion-corrosion mechanisms and implications for operational durability of cermet coatings.
机译：本文描述了固体/液体射流冲击角对碳化钨 - 钴铬热喷涂涂层腐蚀行为的影响的研究。研究的涂层型是标称WC-10％CO-4％CR材料，HVOF喷涂到不锈钢基材上。将该涂层在12m / s的3.5％NaCl溶液中浸没在12m / s中，在18℃下含有各种浓度的悬浮砂颗粒。所用冲击的角度为30,45,60,75和90度，并且测量的总重量损失表现出撞击角度的显着影响，在射流冲击的更倾斜角度下具有降低的材料损失。对样品的阴极保护的实施使得能够确定整体侵蚀腐蚀损坏的纯机械成分，并且还发现这依赖于液体/固体流的撞击角度。相反，纯腐蚀组分（由原位电化学监测确定）表现出具有冲击角的系统趋势。在针对金属陶瓷涂料的操作耐久性方面讨论了发现。

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