The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution

Alizadeh, Mostafa; Bordbar, Sajjad

doi:10.1016/j.corsci.2013.01.026

Cited by 102 publications

(58 citation statements)

References 43 publications

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“…No Brasil os aços ARBL API 5L X70 são os mais usados na fabricação de gasodutos por apresentarem as seguintes propriedades: boa combinação de força e resistência, alta resistência mecânica, aliada à boa tenacidade, ductilidade e soldabilidade (5)(6)(7) . Porém, esses aços são sucintos a corrosão por tensão, permeação por hidrogênio e variação do pH dos fluidos transportados (5,8,9) . Para aumentar a vida útil do ARBL API 5L X70 e redução dos custos com manutenções são utilizadas técnicas de proteção superficial como: metalização por aspersão térmica, galvanização, cladização, eletrodeposição, pintura, difusão, redução química (niquelação) e soldagem para revestimento (10) .…”

Section: Introductionunclassified

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Santos

Maciel

Santana

2015

RBAV

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Concern for the environment has motivated several studies on the use of new materials to extend the life of equipment operating in harsh environments in the oil sector. One alternative that has been used is the application of coatings with high corrosion resistance welding process materials. The objective of this study was to evaluate the effects of different welding parameters on the geometric characteristics, dilution, microhardness, microstructure and corrosion resistance of the coatings with Inconel 625 alloy deposited on the API 5L X70 steel used in oil pipelines to transport plate. The parameters were optimized using the factorial statistical experimental design for analysis of process parameters, and the results analyzed by Response Surface Methodology (RSM). Three deposits were carried out ½ overwrite process GMAW (Gas Metal Arc Welding), followed by cross-sectional analysis of samples for the geometrical and metallographic characteristics. For the analysis corrosion, the coating surface being machined to have a height of 3 mm according to Standard N-1707 Petrobrás coating. The electrochemical behavior of the coating surface (Inconel 625) was investigated at room temperature in NaCl solution using the technique of linear potentiodynamic polarization and electrochemical impedance spectroscopy. To reveal the corrosion resistance of the coatings, featuring some important parameters were considered, such as: the polarization resistance (Rp) and the corrosion potential (Ecorr). The results showed dilution values D (%) ranging from 12.77% to 24.88% in the maximum levels (18.99 KJ/cm) and minimum (8.34 KJ/cm) welding power, and the amounts the most important of 12.77%. As to the corrosion resistance, the results were more satisfactory for the highest level of welding power.Keywords: GMAW; Coating; Corrosion. RESUMOA preocupação com o meio ambiente vem motivando diversas pesquisas sobre o uso de novos materiais para prolongar a vida útil de equipamentos que operam em ambientes agressivos no setor de petróleo. Uma das alternativas que vem sendo utilizada é a aplicação de revestimentos com materiais de alta resistência à corrosão por processo de soldagem. Objetivou-se neste estudo avaliar os efeitos dos diferentes parâmetros de soldagem sobre as características geométricas, diluição, microdureza, microestrutura e resistência à corrosão dos revestimentos com liga Inconel 625 depositados sobre chapa do aço API 5L X70 utilizado em dutos para transporte de petróleo. Os parâmetros foram otimizados utilizando o planejamento experimental fatorial completo para analise dos parâmetros de processo, sendo os resultados analisados pela Metodologia de Superfície de Resposta (MSR). Foram realizados três depósitos com sobreposição de ½ por processo de soldagem GMAW (Gas metal arc welding), seguido de corte transversal das amostras para a analise das caraterísticas geométricas e metalograficas. Para as analises de corrosão, as superfície do revestimento foram usinadas ficando com uma altura de 3 mm de acordo com a norma N...

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Section: Introductionunclassified

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Santos

Maciel

Santana

2015

RBAV

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“…It is known that depending on the manufacturing conditions and thermal treatments to which an X70 steel is subjected, its microstructure can be formed by the presence of different phases, the main being the polygonal ferrite, quasipolygonal ferrite, Widmanstätten ferrite, acicular ferrite, bainitic granular ferrite, bainite ferrite, martensite in addition to the presence of precipitates (Nb(CN), Fe 3 C, MnS, and SiO 2 ) [33][34][35]. is combination of phases can favor a galvanic effect between them, causing the corrosion of the electrochemically less stable phase, generally the ferrite [36], in addition to a nonuniform distribution of the local anodic/cathodic ratio that favors localized corrosion [37]. e microstructure of the API X70 steel (Figure 10) was revealed by attacking the Table 2: Evolution of electrochemical parameters of the EIS spectra after 100 hours of immersion in 3.5% NaCl solution.…”

Section: Morphological Analysis Of Corroded Surfacesmentioning

confidence: 99%

Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Escalera

Ramos-Hernández

Porcayo-Palafox

et al. 2018

Advances in Materials Science and Engineering

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In this study, the effect of the addition of Nd 3+ ions as a corrosion inhibitor of the API X70 steel in a medium rich in chlorides was evaluated. e performance of the Nd 3+ ions was evaluated by means of electrochemical techniques such as potentiodynamic polarization curves, open circuit potential measurements, linear polarization resistance, and electrochemical impedance spectroscopy, as well as by means of scanning electron microscopy and EDS measurements. e results showed that Nd 3+ ions reduce the corrosion rate of steel at concentrations as low as 0.001 M Nd 3+ . At higher concentrations, the inhibition efficiency was only slightly affected although the concentration of chloride ions was increased by the addition of the inhibitor. e adsorption of the Nd 3+ ions promotes the formation of a protective layer of oxides/hydroxides on the metal surface, thereby reducing the exchange rate of electrons. Nd 3+ ions act as a mixed inhibitor with a strong predominant cathodic effect.

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“…Corrosion processes are able to extract metal atoms from the metal lattice, which atoms during the process pass to corrosion products. Corrosion causing local diffusion of metal atoms is particularly dangerous [17][18][19][20][21][22][23][24][25]. The problem is huge because low-carbon structural steel is sensitive to corrosion.…”

Section: Introductionmentioning

confidence: 99%

Corrosion effect of 20 % NaCl solution on basic carbon structural S235JR steel

Lipiński

2017

Engineering for Rural Development

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Abstract. All structural steels offer economical properties of mean strength and low corrosion resistance. There are ferritic-perlitic steels and very often used as construction materials in industrial applications. The purpose of this article is to investigate corrosion resistance using weight loss and profile roughness parameters of typical structural steel in grade S235JR in 20 % NaCl solution in distilled water. Corrosion tests show that the tested steel in both corrosive environments is characterized through continuous corrosion. Roughness parameters for every of the research times determine the size of steel corrosion.Keywords: steel, structural steel, carbon steel, corrosion, corrosion rate, profile roughness. IntroductionSteel is the most popular constructional material. The mechanical, physical and chemical properties of low carbon steel are under the influence of different factors, including the chemical composition and manufacturing technology.The properties and practical applications of all constructional materials, including steel, are determined mostly by their microstructure. The structural low carbon steels have a ferritic-perlitic microstructure. The percentage of each microstructure phase shapes the properties of the steel. The microstructure depends on the manufacturing technology and heat treatments of steel. Corrosion resistance is an important factor of the quality and application of structural steels [1][2][3][4][5][6][7][8][9][10][11][12].Low-carbon steel as a construction material is also very popular. Steels from this group have wide range of industrial applications, mainly as a welded material. The microstructure and properties of these steels are still tested to improve the quality. These steels are willingly used because they are cheap and well welded. Steel structures with low-carbon structural steel can be built by welding quickly at a low price, but still the main problem is their corrosion protection [13][14][15][16].The influence of inner structural stresses caused by the corrosion notches as well as stresses resulting from production with stresses resulting from external load plays an important role in premature destruction of the construction by formation and development of initiation cracks and cracks. Structural stresses also depend on the percentage of each phase in the microstructure and their shape. Microstructure morphology is shaped in the process of manufacturing, heat treatment and welding processes. Corrosion processes are able to extract metal atoms from the metal lattice, which atoms during the process pass to corrosion products. Corrosion causing local diffusion of metal atoms is particularly dangerous [17][18][19][20][21][22][23][24][25]. The problem is huge because low-carbon structural steel is sensitive to corrosion. The corrosion rate first of all depends on different environment [2; 5; 13; 20].One of the corrosive environmental factors are chlorides. They are mainly found on the coast as an aerosol of sea water, and in large quantities in large industrial ar...

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The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution

Cited by 102 publications

References 43 publications

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Corrosion effect of 20 % NaCl solution on basic carbon structural S235JR steel

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The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution

Cited by 102 publications

References 43 publications

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Avaliação de Revestimentos à base de Inconel 625 depositados através do Processo de Soldagem GMAW em aço API 5L X70 utilizando Planejamento Fatorial

Effect of Nd3+ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

Corrosion effect of 20 % NaCl solution on basic carbon structural S235JR steel

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Effect of Nd³⁺ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments