Influence of cold gas spray parameters on the corrosion resistance of Al-Al₂O₃ coatings sprayed on carbon steel

ABSTRACT

This work describes the influence of standoff distance (SoD), and gas temperature on the morphology and corrosion resistance of Al-10%Al₂O₃ coatings deposited by cold gas spray (CGS) on carbon steel. The results showed that the standoff distance had little effect on the thickness and microstructure of the coating. However, a 100 °C decrease of the spraying temperature reduced the coating thickness by 300 µm. The use of electrochemical analyses and SEM images showed that all the coatings studied were able to protect the substrate during at least 1300 h of immersion, due to the dense microstructure obtained by CGS.

KEYWORDS:

• Reinforced coatings
• cold gas spray
• Al-Al₂O₃
• composite

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

F. S. da Silva http://orcid.org/0000-0003-0606-6126

N. Cinca http://orcid.org/0000-0002-1622-8734

S. Dosta http://orcid.org/0000-0002-2925-1933

I. G. Cano http://orcid.org/0000-0003-4947-5675

J. M. Guilemany http://orcid.org/0000-0002-3393-0947

A. V. Benedetti http://orcid.org/0000-0002-0243-6639

Additional information

Funding

The authors thank CNPq (Conselho Nacional de Pesquisa - CNPQ, grants 153177/2014-4 and 201325/2014-4) and PNPD/CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for financial support and scholarships.