Increase in the Reliability of Thermal Sprayed Coatings

Abstract

The characterisation of the effectiveness of sealing was studied by metallographical investigations as well as comparing the investigations with respect to the corrosion- and wear behaviour of the used thermal sprayed coatings and last but not least by measuring of the insulation resistance of the coating system. The obtained results show that there are differences between the used sealants and it is possible through a mechanical treatment of sealed coatings to remove the sealants from the coatings. In the corrosion test the sealants show their efficiency. The sealants insulate the open porosity and prevent the corrosion attack owing to the interconnected pores.

Effect of Some Processing Parameters on Arc Sprayed Coating

“…Impregnation (or sealing ) is used primarily to seal the interconnected porosity in thermally sprayed coatings prior to finishing, assist in reducing particle pullout from the surface during finishing for coating reliability with respect to the wear and corrosion behavior [7,8]. Kamachi et al [9] used electric arc spray of aluminum applied on SUS 304 stainless steel to improve its corrosion resistance.…”

“…Fig (7) The relationship between the wires feed rate and wear rate Fig (8) The relationship between the spraying distance and wear rate.…”