Corrosion inhibition mechanism of Na2CrO4 on 316L in highly concentrated NaOH solutions
Year: 2025
Type: article
Abstract: The corrosion inhibition behavior of Na 2 CrO 4 on 316L in high-temperature concentrated NaOH solution was investigated. The results indicated that Na 2 CrO 4 effectively inhibited the corrosion of 316L. The addition of Na 2 CrO 4 induced the variation of film composition from Ni-rich to Cr-rich. TEM results showed that in the absence of Na 2 CrO 4 , the inner and outer films exhibited lattice fringe structures. In the presence of Na 2 CrO 4 , the inner and outer layers of the passive films exhibited amorphous structures. CrO 4 2− exhibited a mixed mode of adsorption involving chemisorption and physisorption. Chemisorption promoted the formation of Cr-rich protective passive films. Physisorption was beneficial for the self-healing of localized defects in passive films. Besides, the presence of Na 2 CrO 4 induced the competitive adsorption of CrO 4 2− with OH − , which reduced the corrosion susceptibility of 316L.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
OpenAlex ID: W4407596701