Surface passivation is a technique for improving the corrosion resistance of stainless steel. In this work, we studied the effect of cerium treatment on 316L SS. Characterization techniques such as anodic polarization test, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy were employed to correlate the corrosion behavior to surface treatments. Results showed that cerium passivation treatment increase corrosion protection of alloy due to the formation of amorphous oxidation that leads to diffusion control. This improvement is attributed to a more uniform and compact layer which is composed of oxide particles with higher oxygen and chromium concentrations.
The resistance of a passive layer of stainless steel depends on the alloy composition and conditions in which it is generated. Chemical treatment on steel parts could improve the passive layer. In present work, the effect of passivation treatment, with immersion in a dichromate solution with concentrations 10, 20, and 40 g/l for 24 and 72 hr on the stainless steel 316L was investigated. Polarization and electrochemical impedance spectroscopy studies, conducted in NaCl 3.5%, show that 20 g/l dichromate passivation treatment for 72hr would improve corrosion resistance markedly due to the diffusion control reaction. SEM results imply that passivation treatment is advantageous to improve the smoothness. XPS analysis indicated that a stable mixture compound layer was formed and the passive film can be described by a bi-layer model (inner oxide and outer hydroxide layers).
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