Abstract
The corrosion potential of abradable nickel based coating used for aero engine components (for sealing and clearance control in compressor of aero engines) was explored and the effect of acid rain was observed for varied length of time. Coating plays an important role in aero engine manufacturing industry as it provides surface protection against corrosion, erosion, friction and wear when subjected to harsh conditions viz., high temperature and corrosive environment during service period. The coating deposition was done by using thermal plasma spray method. Porosity was observed to be high at critical plasma spray parameter (CPSP). Phase transformation and interlayer oxide formation were also observed during plasma spray coating. A comparative study was established between acid rain treated and untreated samples by evaluating the corrosion resistance potential, microstructural characterization, composition and phase analysis of coatings of treated samples using Scanning electron microscopy, X-ray diffraction and EDS. The weight gain of coating was also evident after acid rain treatment of up to ten weeks of immersion.
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