Erosion Corrosion Study of HVOF Sprayed Thermal Sprayed Coatings on Boiler Tubes:A Review

Abstract

Many industrial parts used in power generation industries fail due to erosion, corrosion, and abrasion causes huge economic losses. These problems can be overcomeby either changing the materialor changing the environment or by separating the material surface from the corrosive environment. The distinct investigations have been carried out to overcome the erosion problems and observedthat erosion resistant coatings have been gaining more importance in recent times. Among the different thermal spray coating techniques, High Velocity Oxy Fuel (HVOF)has emerged as an effective, advancedand rapidly developing processto produce dense coating at relatively low temp.withlow porosity (less than 1%). HVOF has been widely adopted by many industries due to its several advantages such as high micro-hardness, adhesion strength, and erosion-corrosion and wear resistance, flexibility, and cost effectiveness with homogenous coating. The main purpose of this review paper is to reviewprevious research in the field of high velocity Oxy-fuel (HVOF)sprayed coating,especially in context with Indian boilertubes. In addition,an attempt has been made to study their basic principles, merits, demerits, applications and comparison.