The Effect of Surface Treatment on Corrosion Resistance of Austenitic Biomaterial

Abstract

SummaryThis paper focuses on the effect of surface treatment (grinding, electrochemical polishing) on the corrosion resistance of AISI 316L, a Cr-Ni-Mo low-carbon austenitic surgical stainless steel, in a physiological solution at the temperature of 37 °C. The influence of a surface defect and of sensitization by heat treatment on the corrosion behaviour of electrochemically polished surface is also studied. The evaluation is based on the results of cyclic potentiodynamic polarization tests and on the microscopic observation of specimen surfaces after performed tests. The analysis of cyclic potentiodynamic curves showed the highest pitting corrosion resistance of electrochemically polished specimens regardless of the previous sensitization. The as-received specimen showed the highest susceptibility to pitting, which was microscopically confirmed. Based on the performed experiments we can conclude that electrochemical polishing is an efficient chemical surface treatment to increase the resistance of AISI 316L to pitting corrosion; the resistance to pitting corrosion of electrochemically polished surface can by markedly decreased by the presence of mechanical defects; the as-received surface and the ground surface showed lower resistance to pitting corrosion than electrochemically polished ones; sensitization induced by heat treatment (700 °C/10 hours) does not decrease resistance to pitting corrosion.

Surface Chemistry of Passive Films on Ni-Free Stainless Steel: The Effect of Organic Components in Artificial Saliva

“…Its concentration was higher in C-B than in the other formulations. Fluorides were only present in SALMO, and the concentration of 0.11 mg/dm 3 NaF was low in comparison with the concentration of these anions in the literature, e.g., 500 mg/dm 3 NaF and 5000 mg/dm 3 NaF, 21 1000 mg/dm 3 NaF, 4 and 2000 mg/dm 3 NaF. 22 The concentration of chlorides is almost equal in all the solutions (29.8 × 10 −3 M in D, 28.1 × 10 −3 M in CB, and 25.3 × 10 −3 M in SALMO).…”

“…XPS analyses showed that the passive film formed on the stainless steel was mainly composed of chromium oxide and iron oxide, and in the presence of fluoride, a slight increase in the intensity of the metallic components was observed. 4 Zatkali ́kováet al 21 reported that the addition of fluoride ions (0.5 g/dm 3 NaF and 5 g/dm 3 NaF) to a chloride-bearing solution (0.9% NaCl) led to an increase of the pitting potential, thus indicating that fluoride ions inhibit pitting corrosion in a neutral chloride solution. Prolonged immersion tests (42 days) showed local pitting corrosion in the solutions both with and without fluorides.…”

Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint

“…[14] The influence of surface roughness of SS and other metals and alloys on their resistance to pitting corrosion has been considered in a large number of papers. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] The roughness test results presented in these papers are often contradictory. Ezuber et al [15] have shown that resistance to pitting corrosion increases with decreasing surface roughness.…”

Influence on the Quality of Secondary Aluminum Alloy Casts by Mn Addition

“…The size and amount of Al5FeSi also contribute to the formation of solidification defects, such as porosity and hot tearing (Puncreobutr et al, 2014). The commonly used assessment of such dimensions are quantitative image analysis (Vaško, 2016;Bilewicz et al, 2013;Belan, 2014, Zatkalíková, 2017. These methods provide numerical and accurate values of microstructural features.…”