A Comprehensive Pitting Study of High Velocity Oxygen Fuel Inconel 625 Coating by Using Electrochemical Testing Techniques

Niaz, Akbar; Khan, Sajid

doi:10.1007/s11665-015-1846-x

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…It can be hypothesized that "passive-like" stages were produced due to the formation of a thin passive oxide film. However, defects such as pores, oxide inclusions, and interlamellar boundaries led to an interruption in perfect passivity, as these defects act as barriers for diffusion of beneficial elements (such as Cr) for passivation [4,8,24,48,49]. The initial breakaway of a "passive-like" stage might be connected to the galvanic microcells or selective corrosion along lamellae boundaries, based on a mechanism identical to pitting.…”

Section: Codingmentioning

confidence: 99%

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

2016

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There is an increasing demand to replace Co-based coatings with cheap and environmentally friendly Fe-based coatings in corrosive environments. The main objective of this work was to evaluate whether Fe-based coatings could present a better corrosion performance than Co-based coatings. Therefore, two types of Fe-based and one type of Co-based coatings with chemical compositions (in wt %) of Fe-28Cr-16Ni-1.85C (FeNiCrC), Fe-17Cr-12Ni (FeNiCr), and Co-28Cr-1C (CoCrC) were produced by High Velocity Air Fuel (HVAF) spraying. The corrosion behavior of the coatings was studied comparatively by electrochemical tests in 3.5 wt % NaCl solution at 25˝C. The polarization test results showed that the FeCrNiC coating protected the underlying substrate better than the CoCrC coating, while the FeCrNi coating failed to hinder the penetration of corrosive ions. Electrochemical impedance spectroscopy (EIS) measurements revealed that the solution penetrated into the coating through defects, however the corrosion process slowed down due to clogging of the interconnected defects by corrosion products. Increasing the in-flight average particle temperature from 1400˝C to 1500˝C led to a denser coating with fewer defects which seemed to improve the corrosion resistance of the FeCrNiC coating. The high-alloyed Fe-based coatings had the best corrosion protection performance and can thus be recommended as a potential alternative to Co-based coatings.

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Section: Codingmentioning

confidence: 99%

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

2016

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“…From the above analyses, it can be seen that the forming process of Al-Ni-Fe-Gd coating as follows: during the LTS test, Al-Ni-Fe-Gd powders were heated and melted to form small and dispersed droplets and impacted on the substrate surface to form a flat stack of small pieces (Doubenskaia et al , 2013; Lee et al , 2016; Bolelli et al , 2013; Niaz and Khan, 2016). The previously formed flat pieces were covered by later ones and so on formed the sprayed layer (He et al , 2015).…”

Section: Analysis and Discussionmentioning

confidence: 99%

Effect of laser power on amorphous forming capability and corrosion performance of laser thermal sprayed Al-Ni-Fe-Gd coatings

Yan

Dejun

2018

ACMM

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Purpose The amorphous Al-Ni-Fe-Gd coatings were fabricated to improve anti-corrosion performance of offshore platforms. Design/methodology/approach The amorphous Al-Ni-Fe-Gd coatings were first fabricated on S355 steel using the laser thermal spraying. Findings The amorphous forming capability and corrosion resistance increases with the laser powers increasing. Research Limitations/implications The amorphous Al-Ni-Fe-Gd coatings were applied on S355 steel of offshore platforms to increase its long-term heavy and anti-corrosion protection. Originality/value The amorphous Al-Ni-Fe-Gd coatings were first fabricated using a laser thermal spraying, improving its anti-corrosion.

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“…No entanto, nos últimos anos, a descoberta do pré-sal tem motivado a pesquisa de novas tecnologias para proteção contra corrosão dos dispositivos utilizados para a extração do petróleo e gás. Estudos reportados na literatura propõem revestimentos a base de superligas de níquel, empregando-se o processo de aspersão térmica [5] e de cladeamento [6] como uma alternativa mais barata de proteger contra corrosão os aços ao carbono comumente utilizados pelas indústrias petrolíferas. A liga Inconel 625 apresenta boa resistência contra corrosão em comparação a outras superligas de níquel em solução contendo CO2 e H2S [2], indicando um grande potencial para aplicação em ambientes de exploração de petróleo.…”

Section: Introductionunclassified

Microestrutura E Resistência À Corrosão De Junta Soldada De Inconel 625

Ramos¹,

Caselani²,

Simoni³

et al. 2017

Anais Do Enemet - Encontro Nacional De Estudantes De Engenharia Metalúrgica, De Materiais E De Minas

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ResumoAs superligas de níquel apresentam boa combinação de resistência à corrosão e à oxidação, resistência mecânica, resistência à fadiga e à fluência, além de conseguirem operar em temperaturas elevadas, mantendo tais propriedades. A liga Inconel 625 vem sendo estudada como revestimentos, obtidos por cladeamento ou aspersão térmica, para tubos de aços ao carbono utilizados nas indústrias de petróleo e gás. Esses tubos poderão ser unidos pela técnica de soldagem, quando então se obtém uma junta Inconel-Inconel, e isso pode acarretar modificações nas propriedades dessas superligas. O presente trabalho objetiva obter uma junta soldada da liga Inconel 625 empregandose o processo de soldagem a arco utilizando eletrodo revestido Ni-Cr-Mo 3 e caracterizar o cordão de solda quanto à microestrutura, à dureza e à corrosão. A microestrutura foi avaliada por microscopia óptica; para dureza foi realizado perfil de microdureza Vickers ao longo da junta soldada; quanto à corrosão foram realizadas curvas potenciodinâmicas em três diferentes soluções: 3,5% NaCl, 3,5% NaCl + 0,01M Na 2 S 2 O 3 e 3,5% NaCl + 1N H 2 SO 4 . Os resultados obtidos mostraram que a zona fundida tem microestrutura dendrítica, sendo a zona afetada pelo calor de aproximadamente 1,2 mm de extensão. A solda não alterou significativamente as propriedades de corrosão e dureza. Palavras-chave: Inconel 625; Soldagem; Corrosão; Microestrutura. MICROSTRUCTURE AND CORROSION RESISTANCE OF WELD JOINT INCONEL 625 AbstractNickel-based superalloys show a great combination of strength, corrosion, fatigue, creep and oxidation resistance, in addition to the ability of operate in high temperatures. Alloy 625 has been investigated recently like a coating on carbon steel tubes utilized in oil and gas industry utilizing cladding or thermal spray process. These tubes can be joint by welding, however, this process may changes some properties in weld joints InconelInconel. So, the main target of this work is to perform the Inconel 625 weld joint by shielded metal arc welding process with ERCrNiMo-3 and characterize the microstructure, corrosion resistance and hardness. The microstructure was investigated by optical microscopy. Microhardness Vickers profile was done across the joint transverse section. Electrochemical polarization techniques were used to characterize the corrosion resistance in three different solutions: 3.5% NaCl, 3.5% NaCl + 0.01M Na 2 S 2 O 3 e 3.5% NaCl + 1N H 2 SO 4 . The results show that fusion zone microstructure is dendritic and the heat input modified the base metal around 1.2 mm. The weld did not significative modification of corrosion resistance and hardness.

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A Comprehensive Pitting Study of High Velocity Oxygen Fuel Inconel 625 Coating by Using Electrochemical Testing Techniques

Cited by 9 publications

References 34 publications

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

Effect of laser power on amorphous forming capability and corrosion performance of laser thermal sprayed Al-Ni-Fe-Gd coatings

Microestrutura E Resistência À Corrosão De Junta Soldada De Inconel 625

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