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Optimization of steel surface preparation for the fabrication of coating thickness reference materials - RIIIT
Optimization of steel surface preparation for the fabrication of coating thickness reference materials
The quality of the coating depends on the quality of the substrate surface preparation. It is often believed that achieving a mirror finish on metallic substrates is sufficient to obtain a uniform coating or having a rough surface is synonymous with better adhesion. However, both of them, are paradigms. Currently, there is neither a clear definition of the term "mirror finish" nor sufficient information to quantitatively determine the quality of a surface suitable to receive a coating with the following characteristics: homogeneous, stable and uniform. This article presents a procedure designed and implemented to obtain an ad hoc surface (mirror finish) on an AISI M2 metallic substrate, as well as a test bench to know the characteristics of the prepared surface and to see the compatibility and coherence of the substrate and the coating to achieve the properties of a thickness pattern in a coating. The evaluation of brightness according to roughness from 0.04 to 0.08 µm and some of the defect results are as follows; pores from 0.10 to 1.00 µm, scratches from 0.30 to 10.00 µm, then the crystal structure was checked for the substrate and coating, FCC and HC respectively. Therefore, there is coherence in the substrate-coating system. Additionally, the hardness measuring indicated that the substrate is harder than the coating, this will favor adhesion between both of them.
Keywords: Coherence structural, Mirror finish, Standard, Surface defects.
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