DEVELOPING RELATIONSHIP TO PREDICT THE IMMERSION CORROSION RATE OF HVOF SPRAYED IRON BASED AMORPHOUS METALLIC COATING ON 316 STAINLESS STEEL
Keywords:
High velocity oxy fuel spray, Iron based amorphous metallic coating, Corrosion rateAbstract
Fluid handling equipment such as propellers, impellers, pumps posses the inherent risk of flow- dependent erosion-corrosion problems. Iron based amorphous coatings exhibits high erosion– corrosion resistance. High velocity oxy-fuel spray process is widely used to deposit erosion-corrosion resistance amorphous coatings. In this investigation, iron based amorphous metallic coating was deposited on 316 stainless steel using HVOF spray process by optimized process parameters such as oxygen flow rate, fuel flow rate, powder feed rate, carrier gas flow rate, and spray distance. The immersion corrosion test was conducted to evaluate the corrosion rate of uncoated and iron based amorphous coated SS by varying the corrosion test parameters such as pH value, chloride ion concentration and immersion time. Empirical relationships were established to predict the corrosion rate of uncoated and iron based amorphous coated 316 SS. The corrosion morphology of the uncoated and coated samples was done by scanning electron microscope. From the results, it is found that, pH value appeared to be the most significant parameters affecting the corrosion properties of the iron based amorphous coating.
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