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首页> 外文会议>NACE annual conference & exposition >THE CORROSION BEHAVIOUR OF HVOF SPRAYED STAINLESS STEELAND NICKEL ALLOY COATINGS IN ARTIFICIAL SEAWATER
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THE CORROSION BEHAVIOUR OF HVOF SPRAYED STAINLESS STEELAND NICKEL ALLOY COATINGS IN ARTIFICIAL SEAWATER

机译：人造海水中HVOF喷涂的不锈钢纳米镍合金涂层的腐蚀行为

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One of the principal aims was to determine if HVOF sprayed coatings of stainless steel and nickel alloys have similarcorrosion properties in seawater compared to conventional wrought materials. The work reported here measured the level ofcorrosion performance that can be expected from coatings of corrosion-resistant alloys deposited onto a steel substrate usingcommercially available HVOF spraying systems. Two alloy types were considered, a stainless steel with a compositionsimilar to 316L (UNS S31603) and a nickel base alloy with composition similar to alloy 625 (UNS N06625). The cyclicpotentiodynamic polarisation method was used to examine the corrosion behaviour of these coatings and the same alloys inwrought form. A HVOF sprayed coating of nickel alloy 625 was found to be more corrosion resistant in seawater than acoating of 316L stainless steel. However, the nickel alloy coating did not match the corrosion resistance of the same nickelalloy in wrought form, but may have the ability to offer corrosion resistance (in seawater) approaching that of wroughtstainless steel. The lower level of corrosion resistance of the nickel alloy coating compared to the same material in wroughtform is believed to be due to microstructural differences and in particular related to preferential attack along the inter-particle(splat) boundaries of the coating.
机译：主要目的之一是确定与常规锻造材料相比，不锈钢和镍合金的HVOF喷涂涂层在海水中是否具有相似的腐蚀性能。此处报道的工作测量了使用商业上可买到的HVOF喷涂系统将抗腐蚀合金涂层沉积到钢基材上所期望的腐蚀性能水平。考虑了两种合金类型，一种成分类似于316L的不锈钢（UNS S31603）和成分类似于合金625的镍基合金（UNS N06625）。循环电位动力极化方法用于检查这些涂层和相同合金的锻造形式的腐蚀行为。发现镍合金625的HVOF喷涂涂层比316L不锈钢涂层在海水中的耐腐蚀性更高。但是，镍合金涂层与锻造形式的相同镍合金的耐蚀性不匹配，但是可能具有提供与锻造不锈钢相近的耐蚀性（在海水中）的能力。与锻造形式的相同材料相比，镍合金涂层的耐腐蚀性较低，这被认为是由于微观结构的差异，特别是与沿涂层的颗粒间（splat）边界的优先腐蚀有关。

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