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DYNA

versão impressa ISSN 0012-7353

Resumo

ALEGRIA-ORTEGA, Johanna; OCAMPO-CARMONA, Luz Marina; RODRIGUEZ, Fernando  e  FORLERER, Elena. Cr/CrN bilayer coating behavior under erosion-corrosion degradation by jet impingement testing. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.197, pp.145-152. ISSN 0012-7353.  http://dx.doi.org/10.15446/dyna.v83n197.52184.

Cathodic arc technique was used to deposit a Cr/CrN bilayer coating on AISI 440C stainless steel. The morphology and composition of the coating were verified by Scanning Electron Microscope and X-Ray Diffraction. Hardness and adhesion of the coating were also studied. In the erosion-corrosion wear, a slurry jet with impingement angle 90° at 4 and 8 m/s was used to impact upon bare and coated steel. All the wear mechanisms were evaluated according to ASTM G-119. The results indicate that the synergism wear rate is the most aggressive wear component, exceeding 40% of the total mass loss for coating steel and 60% of mass loss for bare steel. An increase in the impact velocity increases mass loss for both bare and coated steel. In comparison, the Cr/CrN coating had better corrosion and erosion-corrosion resistance.

Palavras-chave : Multilayer coating; Staintess Steel; Cathodic Arc; erosion-corrosion.

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