کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1469672 | 990306 | 2011 | 10 صفحه PDF | دانلود رایگان |
Nanocomposite TiSiN coatings were deposited on tool steels. Detailed mechanisms that govern the corrosion of these coated steels were revealed, following immersion tests in a 70% nitric acid solution. Pitting originated preferentially from coating defect sites and expanded with increasing immersion time. Both Young’s modulus and hardness measured by nanoindentation decreased as the corrosion damage intensified. A thin oxide layer formed from the thermal annealing of the as-deposited samples at 900 °C was found to be effective against corrosive attack. In addition, compressive residual stress was noted to suppress the propagation of corrosion-induced cracks. The role of residual stress in controlling the corrosion resistance of these ceramic-coated steels is clarified by finite element analysis.
► Pitting, originating from surface defects, was the dominant corrosion mechanism in TiSiN coated steels.
► The thin oxide layer generated by annealing provided protection against corrosion.
► Compressive residual stress resisted the propagation of corrosion in TiSiN coated steels.
Journal: Corrosion Science - Volume 53, Issue 11, November 2011, Pages 3678–3687