Corrosion of APS- and HVOF-Sprayed Coatings of the Al₂O₃-TiO₂ System Available to Purchase

This paper presents the results of corrosion investigations performed on thermal spray coatings with different compositions in the Al₂O₃-TiO₂ system. The coatings were deposited on stainless steel via APS and HVOF spraying and metallographically prepared cross sections and surfaces were characterized before and after corrosion testing in NaOH and H₂SO₄ solutions at various temperatures. Opposite of expectations, APS coatings were found to be more corrosion resistant than the denser HVOF-sprayed layers.