Abstract
SEM/EDX, XPS, corrosion and surface roughness characterization of AISI 316L SS after electrochemical treatment in concentrated HNO3
Highlights
Stainless steels are commonly treated by electropolishing considered as a standard electrochemical process/treatment [1 ÷ 6]
Concerning improved corrosion resistance [12 ÷ 18], the steel parts may be chemically treated in concentrated nitric acid and that process is described in the literature [19 ÷ 21]
The data in this paper show that the pitting potential is equal to 1160 mV only after electro-passivation treatment in HNO3
Summary
Stainless steels are commonly treated by electropolishing considered as a standard electrochemical process/treatment [1 ÷ 6]. The process is generally used in industry for finishing operations and is often carried out in the mixture of two acids, H2SO4 and H3PO4 [7 ÷ 10]. After this process a treated part reveals smooth and bright surface with good corrosion resistance and improved mechanical properties [10 ÷ 16]. It is of special importance when using that stainless steel as a biomaterial. There are no study results available on electrochemical treatment of stainless steels in concentrated nitrogen acid
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