Oxide Film Growth by CSV on AISI 316L: a Combined Electrochemical and Analytical Characterization

Study of ceramic‐like aluminum oxide thin films developed using plasma electrolytic oxidation applied on austenitic steels

“…The fact that the increase in the content of Al in the surface layer is accompanied by the decrease of nickel and Cr concentration suggests that the formation of the dielectric barrier layer suitable for the MAO treatment can be achieved by a preliminary treatment, to form an iron oxide film without Ni and Cr on the steel substrate. For this purpose two types of treatments were tested: the steel substrate oxidation by CV producing thin oxide layer depleted in Ni and Cr—the case of sample D1 (the CV polarization curves are shown in Fig. a); the oxidation in autoclave, in demineralized water at 600 °C, which produces a thick layer of magnetite over a substrate (thickness increases with time autoclaving)—the case of the sample D2. …”

“…During the cycling process, in the case of steel substrate oxidation by CV, the original thin native oxide film, mainly composed of Cr and Fe oxides, is converting into a layer, mainly based on magnetite, as is shown in …”

“…The paper analyzes the possibility to control at nano‐scale level the structure of films developed under different conditions by CV. To improve the corrosion resistance of the steels exposed to oxygen containing HLM above 500 °C, one possibility is the alloying of the steel surface with Al.…”

“…On the surface of the D1 sample a thin oxide film was raised by cyclic voltammetry (CV), using a PAR Electrochemical System 2273 . CV is a well‐known electrochemical procedure used to grow surface films …”

Estudo da eficiência de inibidores e da resistência à corrosão localizada da superliga Incoloy 800, utilizada no circuito secundário do gerador de vapor do tipo PWR, em meio simulador de frestas.

“…Após os ensaios de polarização, os corpos de prova foram analisados, mantendo constante a concentração de íons cloreto: solução 2 (NaCl 0,3M), 3 (NaCl 0,3M + Na S 2 O 3 10 -3 M), 4 (NaCl 0,3M + Na 2 S 2 O 3 10 -2 M), 5 (NaCl 0,3M + Na 2 S 2 O 3 0,075M), 6 (NaCl 0,3M + Na 2 S 2 O 3 0,2M) e 7 (NaCl 0,3M + Na 2 S 2 O 3 0,3M). (WU, WANG et al, 2017); (GE, ZHOU e WU, 2003), ou então às propriedades apenas do filme passivo (DÍAZ, FREIRE et al, 2013); (TERADA, ANTUNES et al, 2006 1 -198,3 / 199,8 -200,0 NIST 2010 Fonte: Próprio autor 198,8 -199,9 / 200,4 -201,8 NIST 2010 A partir da deconvolução do espectro do S2p para a amostra ensaiada na solução de NaCl 0,3M + Na 2 S 2 O 3 0,075M (Figura 87(b) NaCl 0,3M + Na 2 S 2 O 3 0,3M 6,5 75,2 18,3 Fonte: Próprio Autor A partir dos resultados apresentados na Tabela 20, nota-se que para a solução de NaCl 0,3M + Na 2 S 2 O 3 0,075M, o cromo se apresentou com dois estados de oxidação, Cr 0 e Cr 3+ (Cr 2 O 3 ), enquanto que na solução de NaCl 0,3M + Na 2 S 2 O 3 0,3M, apenas o estado Cr 3+ foi detectado. Faichuk 2013 (XIA, ZHU et al, 2014).…”