Effect of temperature on the corrosion resistance and pitting behaviour of Alloy 31 in LiBr solutions

Blasco‐Tamarit, E.; Muñoz, A. Igual; Garcı́a-Antón, J.; García-García, D.M.

doi:10.1016/j.corsci.2008.03.016

Cited by 73 publications

(51 citation statements)

References 46 publications

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“…This phenomenon demonstrates that the incorporation of zinc nitrate with a higher concentration (as compared to 10 −4 M) into the NaCl solution can rapidly produce the healing effect. Beyond 10 −4 M, for the samples immersed in the solution doped with 5 × 10 −3 and 10 −2 M zinc nitrate, marked "d" and "e", OCP were initially higher but the strong fluctuations with oscillations of around 50 mV/SCE could be observed in all stages of immersion indicating susceptibility of these coating systems to pitting corrosion [25]. These phenomena showed that addition of higher concentration of zinc nitrate (as compared to 10 −3 M) would demonstrate a negative effect on inhibiting the corrosion of this coating system.…”

Section: Open Circuit Potentialmentioning

confidence: 95%

A novel approach to heal the sol–gel coating system on magnesium alloy for corrosion protection

Zhong

et al. 2010

Electrochimica Acta

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Section: Open Circuit Potentialmentioning

confidence: 95%

A novel approach to heal the sol–gel coating system on magnesium alloy for corrosion protection

Zhong

et al. 2010

Electrochimica Acta

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“…These preliminary results can serve as a strong foundation for use of vanadate for moderately high temperature corrosion inhibition. However, due to the extensive successful use of chromate as a corrosion inhibitor over many decades and under a wide variety of conditions, [52][53][54] the challenge of replacing chromate under high temperature conditions will require a considerable extension of this work.…”

Section: Discussionmentioning

confidence: 99%

Inhibition Performance Study of Vanadate on AA2024-T3 at High Temperature by SEM, FIB, Raman and XPS

Hurley

Buchheit

2015

J. Electrochem. Soc.

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The inhibition of AA2024-T3 by vanadate at temperatures ranging from 10 • to 80 • C was studied using various characterization techniques. SEM showed that in the presence of vanadate, no corrosion was observed on any intermetallic particles, including the reactive Al 2 CuMg (S phase) at temperatures up to 50 • C. Although trenching occurred around the S phase particles when solution temperature increased to 70 • C and above, S phase was protected by vanadate-bearing film. Raman spectroscopy showed a peak indicating polymeric vanadate, which increased in intensity with increasing temperature with the highest intensity at 80 • C. The high vanadium concentration at 80 • C was attributed to fast reduction reaction kinetics of vanadate by Al or Mg. This reduction reaction is confirmed by XPS, and the reduced forms of vanadium appeared to promote vanadate (V 5+ ) polymerization leading to the formation of vanadate films. Additionally, elevated temperatures appeared to increase vanadate polymerization kinetics. This reductive adsorbed vanadate film also enabled the samples treated in vanadate at higher temperature to have residual inhibition in NaCl without inhibitors. The reduced forms of vanadium were found to be easily oxidized under ambient aerated solution conditions. Exposure of treated samples in air further increased the corrosion resistance. AA2024-T3 (Al-4.4Cu-2.5Mg-0.6Mn) is a high strength Al alloy that is susceptible to many forms of localized corrosion due to its heterogeneous microstructure.1,2 Localized corrosion is focused at secondary phase intermetallic compounds (IMCs).3,4 Two common IMCs of interest in AA2024 are S-phase (Al 2 CuMg) and AlCuFeMn(Si) particles. These two IMC types account for the majority of particles found in AA2024, both in number and surface area.4,5 AlCuFeMn(Si) particles generally act as cathodes to the matrix, and corrosion occurs as trenching around the particles under corrosive conditions. 3,6-10 S-phase particles are initially active and dissolve by dealloying.4 However, upon the dissolution of Mg and Al from these particles, they become Cu-rich and thereafter act as a local cathode. 4,6,[11][12][13] In view of recent advances in understanding the chemistry of vanadate, it has become an intriguing inhibitor to the research community.14-20 Vanadate has proven to be a promising candidate to replace toxic chromate as a corrosion inhibitor. In particular, vanadate has shown good inhibition on aluminum alloys in the form of soluble vanadate, [17][18][19][20][21][22][23][24][25][26] vanadate-based coatings, 27-29 and ion exchange compounds pigment for primers. 30 Iannuzzi et al. used polarization and split cell experiments to show that vanadate acted as a cathodic inhibitor on AA2024 by suppressing the oxygen reduction reaction (ORR) by a physically adsorbed vanadate monolayer. 23,24 The inhibition of vanadate on AA2024-T3 was also reported by Ralston et al. while studying corrosion inhibition imparted by vanadate on IMCs found in AA2024 and AA7075-T6. 25,31The effect of temperat...

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“…Porém o uso de HCl leva a formação de glicerina com certo teor de cloreto, o que favorece a corrosão por pite nos pontos de dosagem dos aços da linha de produção [8][9][10]. A corrosão por pite é uma das formas mais comuns e perigosas de corrosão localizada e ocorre, geralmente, em ambientes agressivos, como em soluções de brometo e cloreto [9,11]. Alguns autores estudaram a corrosão de aços inoxidáveis em meios de biodiesel [12][13][14], mas a avaliação da corrosão de aços inoxidáveis em meio de glicerina acidificada não é encontrada na literatura.…”

Section: Introductionunclassified

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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Effect of temperature on the corrosion resistance and pitting behaviour of Alloy 31 in LiBr solutions

Cited by 73 publications

References 46 publications

A novel approach to heal the sol–gel coating system on magnesium alloy for corrosion protection

A novel approach to heal the sol–gel coating system on magnesium alloy for corrosion protection

Inhibition Performance Study of Vanadate on AA2024-T3 at High Temperature by SEM, FIB, Raman and XPS

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

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