Análise comparativa de composição química e resistência à corrosão entre terminais de aço revestidos de Zinco puro e liga Zinco-níquel.

Abstract

With the growth in the use of coatings for steel protection beyond the conventional protection of pure zinc, it became necessary to develop different coatings from those already being used in the market, such as zinc-nickel alloy. In view of this prerogative, this work draws a comparison between protective metallic coatings, in order to know which factor guarantees greater durability to corrosion in the environment. The methodology was divided into a labor study on the chemical and structural compositions of Zinc and Zinc-Nickel alloy coatings, and the amount of elements present and the microstructures formed from such compositions through SEM/EDS techniques and scientific articles with XRD analyses. To understand this study and be able to draw the parallel between practice and theory, a saline mist test was performed according to the ASTM B117 standard. Issues were discussed about the chemical and structural composition of coatings and how they can directly influence the corrosion resistance presented in the salt-spray tests and how this can affect the choice of which coating to use.