Correlation between Corrosion Potential and Pitting Potential for AISI 304L Austenitic Stainless Steel in 3.5% NaCl Aqueous Solution

Alonso-Falleiros, Neusa; Wolynec, Stephan

doi:10.1590/s1516-14392002000100013

Cited by 31 publications

(13 citation statements)

References 14 publications

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“…The OCP curve of the unaged sample resembles that of an as‐solution‐treated 304L austenitic stainless steel in 3.5% NaCl studied by Alonso‐Falleiros and Wolynec . According to these authors, the initial drop of the OCP curve should be associated with reductive dissolution of the oxide film formed in air, while the gradual OCP increase has to do with the growth of a new film formed in 3.5% NaCl.…”

Section: Resultsmentioning

confidence: 82%

Short‐term spinodal decomposition – its effects on corrosion behaviour of a duplex stainless steel and feasibility as a strengthening treatment

Kuan

Dong

et al. 2016

Materials & Corrosion

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The present paper looks into the effects of spinodal decomposition (SD) on the corrosion resistance and cavitation erosion behaviour of the duplex stainless steel (DSS) 7MoPLUS. SD takes place at 500 8C in the ferrite phase at the early stage of thermal ageing, with an attendant hardness increase. Nevertheless, thermal ageing at this temperature for up to 2 days nearly does not reduce pitting potential (in 3.5% NaCl). Surface integrity, however, is degraded by the appearance of noticeable pits after just a few hours of exposure to this temperature. Ageing for 1 week at 500 8C does not seem to alter the corrosion morphology of the ferrite phase in 1 M HCl. On the other hand, SD does bring about changes to the nature of passive film, as demonstrated by open-circuit potential measurements in 3.5% NaCl. The cavitation erosion (CE) resistance of 7MoPLUS is slightly enhanced by short-term SD treatment (for 5 h), as propagation of CE damage emanating from deformation twins in the ferrite phase is made less efficient. It is suggested that short-term SD treatment is a feasible strengthening method for DSSs.

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Section: Resultsmentioning

confidence: 82%

Short‐term spinodal decomposition – its effects on corrosion behaviour of a duplex stainless steel and feasibility as a strengthening treatment

Kuan

Dong

et al. 2016

Materials & Corrosion

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“…Some studies focused on the comparison of these methods by considering surface conditions and pitting potential measurement as well as evaluation of the effect of alloying elements on the pitting susceptibility of stainless steels . Potentiodynamic test is used not only for the evaluation of different parameters affecting localized corrosion, but also assessment of breakdown potential distribution of stainless steels …”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24][25][26][27] Some studies focused on the comparison of these methods by considering surface conditions [28] and pitting potential measurement [22] as well as evaluation of the effect of alloying elements on the pitting susceptibility of stainless steels. [8] Potentiodynamic test is used not only for the evaluation of different parameters affecting localized corrosion, [29][30][31][32][33] but also assessment of breakdown potential distribution of stainless steels. [17] In this work, both techniques are used to characterize localized corrosion of stainless steel grade AISI 304L in solution with different chloride concentration in order to compare the two methods in terms of reliability to determine breakdown and repassivation potentials.…”

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confidence: 99%

Electrochemical methods for the determination of Pedeferri's diagram of stainless steel in chloride containing environment

Dastgerdi

Brenna

Ormellese

et al. 2018

Materials & Corrosion

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Stainless steels are prone to localized corrosion (pitting and crevice) in the presence of oxygen and chlorides over a critical threshold. Prediction of the corrosion behavior of stainless steels in chloride containing environment is of great importance; for this reason, Pedeferri's diagram is proposed to define corrosion and passivity (perfect and imperfect conditions) as a function of the potential and chloride content. In this paper, the first effort is carried out to define electrochemical conditions to obtain the diagram. Potentiodynamic and potentiostatic polarization tests are performed on AISI 304L type stainless steel. Localized corrosion potential and critical chloride content found with two different methods are in fair agreement. Pedeferri's diagram is built for type 304L stainless steel at room temperature and pH 6. Corrosion, perfect and imperfect passivity regions are separated by scattering band for localized corrosion and repassivation potentials.

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“…Fonte de referência não encontrada.1, é possível notar que os aços avaliados apresentaram comportamento típico, com regiões ativa, de passivação e transpassivação [30]. O rápido aumento da densidade de corrente indica a ocorrência de formação de pites estáveis ou dissolução da camada passiva, em que o potencial de pite (Epit) é dado pela reta definida pela interseção da curva antes do aumento de densidade de corrente com a linha definida pela curva após o aumento de corrente [31]. Também se observa que a densidade de corrente de passivação se concentrou na faixa de 10 -7 a 10 -6 para ambos os aços.…”

Section: Estudos Eletroquímicosunclassified

Resistência À Corrosão Dos Aços Aisi 317l E Saf 2304 Em Meio De Glicerina Acidificada Contendo Cloretos

Menezes¹,

Lins²,

Castro³

2019

ABM Proceedings

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ResumoO biodiesel, obtido a partir de um éster e um álcool na presença de um catalisador, é produzido pela reação de transesterificação e tem como coproduto a glicerina. A produção de biodiesel da Petrobras Biocombustível tem, em uma de suas etapas, a lavagem dos produtos para remoção do catalisador básico, metilato de sódio, por meio da reação de neutralização com ácido clorídrico. Devido a essa prática, a glicerina obtida é acidificada e contêm resíduos de cloretos, o que leva à corrosão localizada dos aços utilizados em determinados pontos do processo de produção. Dessa forma, o presente trabalho avaliou a resistência à corrosão do aço austenítico 317L e do aço lean duplex 2304, em meio de glicerina acidificada contendo cloretos. Todas as medidas foram conduzidas a 64ºC, visando simular as condições de operação da empresa. Para o estudo em questão, utilizou-se as técnicas de potencial de circuito aberto (OCP), polarização potenciodinâmica e microscopia eletrônica de varredura (MEV). As análises mostraram que o aço AISI 317L obteve menor potencial de pite que o SAF 2304, logo foi menos resistente. Por meio do MEV foi possível confirmar a presença dos pites, sendo que as cavidades presentes no aço AISI 317L foram mais numerosas e profundas que as observadas no aço SAF 2304. Palavras-chave: Glicerina; Cloreto; Aços inoxidáveis; Polarização potenciodinâmica. CORROSION RESISTANCE OF AISI 317L AND SAF 2304 STEEL IN MEDIUM OF GLYCERIN ACIDIFIED CONTAINING CHLORIDE AbstractBiodiesel and glycerin, obtained from ester and alcohol in presence of a catalyst, are produced by the transesterification reaction. The production of biodiesel by Petrobras Biocombustível has, in one of its stages, the washing of products to remove the basic catalyst, sodium methylate, through the neutralization reaction with hydrochloric acid. Because of this practice, the glycerin obtained is acidified and contain residues of chloride, which leads to localized corrosion of the steel used in certain points of the manufacturing process. Austenitic and lean duplex stainless steels such as AISI 317L and SAF2304 are alternative materials of equipment of biodiesel plant which is in contact with acidified glycerin containing chloride. This work aims to evaluate the pitting corrosion resistance of the AISI 317L stainless steel and the SAF 2304 lean duplex stainless steel in solution of acidified glycerin containing chloride at a service temperature of 337K. For the present study, was used the open circuit potential techniques (OCP), potentiodynamic polarization and scanning electron microscopy (SEM). Analyses showed that steel AISI 317L had lower pitting potential that the SAF in 2304, therefore was less resistant. By SEM it was possible to confirm the presence of pitting in the steels. The cavities present in the steel AISI 317L were more numerous and deeper than those observed in the steel SAF 2304.

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Correlation between Corrosion Potential and Pitting Potential for AISI 304L Austenitic Stainless Steel in 3.5% NaCl Aqueous Solution

Cited by 31 publications

References 14 publications

Short‐term spinodal decomposition – its effects on corrosion behaviour of a duplex stainless steel and feasibility as a strengthening treatment

Short‐term spinodal decomposition – its effects on corrosion behaviour of a duplex stainless steel and feasibility as a strengthening treatment

Electrochemical methods for the determination of Pedeferri's diagram of stainless steel in chloride containing environment

Resistência À Corrosão Dos Aços Aisi 317l E Saf 2304 Em Meio De Glicerina Acidificada Contendo Cloretos

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