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Corrosion behavior selected thermally sprayed cermet and based alloy coatings

机译：腐蚀行为选择热喷涂的金属陶瓷和基合金涂层

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Nowadays, some thermal spraying technologies enable to deposit coatings which provide components primarily with corrosion resistance. The corrosion resistance of these coatings requires mainly high density and good adhesion of coating and substrate. Even if the majority of thermally sprayed materials meet the requirements for high corrosion resistance in terms of their composition, the generally porous structure raises doubts if the thermally sprayed coatings are really able to provide the base material with sufficient protection. This article is aimed to contribute to the extension of knowledge about HP/HVOF (High Pressure/High Velocity Oxygen Fuel) technology and particularly about deposited coatings. This paper summarizes the results of corrosion tests conducted on two selected corrosion resistant coatings - cermet based Cr_3C_2-25% NiCr coating and alloy based Hastelloy C-276 coating. These two evaluated coatings were subjected to specific corrosion tests. These tests were hot corrosion tests, potentiodynamic corrosion tests and commercially very frequently used tests in salt spray corrosion chamber. The corrosion test results proved that none of the evaluated coatings performed well in all corrosive environments. It is instead recommended to select always a suitable coating based on the knowledge of particular corrosive environments. This research confirms the above mentioned statement and explains it on the examples of evaluated coatings and selected corrosive environments. The evaluation of corrosion attack was conducted before and after the corrosion tests on coating surface and in cross-section after metallographic grinding using a scanning electron microscope (SEM).
机译：如今，一些热喷涂技术使沉积涂层，其提供部件主要与耐腐蚀性。这些涂层的耐腐蚀性，需要主要的高密度和涂层与基体的良好粘附。即使大多数热喷涂材料满足在它们的组成方面的高耐腐蚀性的要求，通常的多孔结构使人怀疑，如果热喷涂层是真正能提供基材用足够的保护。这篇文章的目的是促进有关HP / HVOF知识（高压/高速氧燃料）技术，特别是关于沉积的涂层的延伸。本文总结对两个所选择的耐腐蚀涂层进行腐蚀测试的结果 - 基于Cr_3C_2-25％镍铬涂层和合金基于镍基合金C-276涂层的金属陶瓷。这两个评价涂层进行特定腐蚀试验。这些测试是热腐蚀试验，电位腐蚀试验和在盐雾腐蚀室市售非常常用的测试。腐蚀试验结果表明，没有评价涂层在所有腐蚀性环境表现良好。这是不是建议始终选择基于特定的腐蚀环境的知识合适的涂层。这项研究证实了上述陈述以上，并解释它评估涂料和选择腐蚀性环境的例子。腐蚀侵袭的评价是和前上涂覆表面的腐蚀试验后和在用扫描电子显微镜（SEM）金相磨后的横截面进行的。

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