Raman mapping of corrosion products formed onto spring steels during salt spray experiments. A correlation between the scale composition and the corrosion resistance
Raman mapping of corrosion products formed onto spring steels during salt spray experiments. A correlation between the scale composition and the corrosion resistance
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DOI：
10.1016/j.corsci.2008.09.027
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发表时间：
2008-12-01
影响因子：
8.3
通讯作者：
Duret, C.
中科院分区：
文献类型：
--
作者：
Dubois, F.;Mendibide, C.;Duret, C.
在汽车工业中，减少车辆重量以提高燃料效率并因此减少CO2排放的趋势日益增长。对于许多汽车部件，如弹簧，通过增加机械性能（允许更小的部件尺寸）来减轻重量。对于超高强度弹簧，良好的耐腐蚀性至关重要，以避免表面损伤，这将不利于耐腐蚀疲劳性。腐蚀疲劳失效实际上经常在由使用中的腐蚀（腐蚀坑）引起的表面缺陷上开始。因此，超高强度弹簧钢的耐腐蚀性在常规弹簧钢中虽然不太重要，但却是至关重要的。钢的化学成分的细微变化会对耐腐蚀性产生重要影响。为了了解每种元素对弹簧钢耐腐蚀性的单独作用，使用专门设计的实验工具中的拉曼光谱来表征暴露于NaCl环境的样品上形成的腐蚀产物，该实验工具允许绘制钢表面上的腐蚀产物。因此，在加速腐蚀试验之后表征不同的钢等级，并且在重量损失和腐蚀产物的性质之间建立了明确的相关性。(C)2008爱思唯尔有限公司保留所有权利。
There is a growing trend in the automotive industry to reduce vehicles weight so as to increase fuel efficiency and therefore reduce CO2 emissions. For many automotive components such as springs, weight reduction is sought through an increase in the mechanical properties (allowing smaller components size).For ultra high strength springs, a good corrosion resistance becomes essential to avoid surface damage that will be detrimental to the corrosion-fatigue resistance. Corrosion-fatigue failures indeed often initiate on surface defects caused by corrosion in service (corrosion pits). Therefore, while of moderate importance in conventional spring steels, the corrosion resistance Of ultra high strength spring steels is of primary importance.Fine changes in steel chemical composition can have an important effect on corrosion resistance. To understand the individual action of each element on the corrosion resistance of spring steels, corrosion products formed on samples exposed to NaCl environments were characterized using Raman spectroscopy, in a purposely designed experimental tool that allows mapping of corrosion products on the steel Surface (by nature and mass fraction).Different steel grades were thus characterized after accelerated corrosion tests, and a clear correlation was established between weight loss and the nature of the corrosion products. (C) 2008 Elsevier Ltd. All rights reserved.