Análise comparativa da corrosão entre elementos de fixação em aço inoxidável e aço carbono fosfatizado

Abstract

Corrosion is a spontaneous process and is present in various environments such as industrial equipment, metal structures, concrete, in everyday life, among others, and can be minimized through metal surface protection techniques, such as black oxidation or black phosphating. Over the years, new corrosion prevention techniques have been refined and developed. The phosphating process is used as a pre-treatment for different types of metals to reduce the incidence of corrosion. In this work, the effect of black p phosphating (black cold oxidation) on carbon steel was evaluated. After treatment, the fastening elements were subjected to an accelerated corrosion test in an aqueous solution of sulfuric acid, simulating acid rain and were visually evaluated for surface appearance using a macroscope. The analysis of the results obtained initially suggests that the black oxidation used in the study is ideal for situations that are not so demanding, since the screw was severely corroded even with the treatment.