Título

INFLUENCE OF NORMAL LOAD AND COUNTERFACE ROUGHNESS ON MICRO-ABRASION/CORROSION OF AISI 304 IN 1N H2SO4 ENVIRONMENT

Autoria

Wilian da Silva Labiapari; Miguel Angel Narvaez Ardila; Marcelo Braga dos Santos; José Daniel Biasoli de Mello

DOI

10.5151/1472-5836-25778

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Resumo

Austenitic stainless steels are widely known for their good weldability, excellent mechanical properties for deep drawing and superior corrosion resistance in environments where most of the metals fail. Their uses include many applications subjected to a combination of mechanical and corrosive wear, such as pumps, valves and surgical implants. Although their corrosion resistance has been largely investigated, their resistance to mechanical wear is less studied. In particular, their performance under conditions involving combined corrosive and mechanical wear is not well understood. The aim of this study is to demonstrate the effect of the mechanical component on the electrochemical signal of an anodic polarization curve. A test rig was developed to investigate micro-abrasion-corrosion using a fixed ball configuration. Tests were carried out using stainless steel AISI 304 samples and 25.4 mm zirconia balls as counter bodies. The electrolyte was a 1N H2SO4 solution with SiO2 as abrasive dispersed at the concentration of 10 wt%. The results showed an increase in current density when the counter face roughness and the normal load applied during the tests are increased, evidencing a mechanical influence on the surface activity of this material in a corrosive environment.

 

Palavras-chave

Abrasion-corrosion; Mechanical influence; AISI 304