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...
In the present work, PTA welding process was used to investigate the influence of welding parameters on the dilution, microhardness and corrosion resistance of Inconel 625 alloy coatings on the API 5L X70 grade steel. The electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization (LPP) measurements were used to study the protection properties of the deposited layer when immersed in a 3.5% NaCl solution. The results of EIS and LPP have shown that the corrosion resistance results were more satisfactory for coatings with higher dilution index. The results also showed that the dilution values D (%)varied from 15.33% to 4.39% at the maximum (18.99 kJ/cm) and the minimum (8.34 kJ/cm) welding energy levels. The most relevant dilution value obtained was 4.39%.
Annually, high investments are made in the maintenance of pipelines used in the oil industry around the globe. Thus, solutions are sought that combine low cost, reproducibility and properties that are consistent, mainly against corrosion. One of these is the use of materials that have high mechanical and anticorrosive properties in the form of coatings, which could be deposited by welding. The objective of this study was to evaluate the effects of different welding parameters on the corrosion resistance of coatings based on the Inconel 625 alloy, deposited by metal inert gas welding metal (MIG) process in API 5L X70 steel. The parameters were optimized using the factorial experimental design and the results analyzed by the Response Surface Methodology (RSM). Three deposits with ½ overlap were performed MIG, followed by a cross section cut in the samples for analysis of the dilution, iron content and corrosion resistance by potentiodynamic polarization (PP) through corrosion potential (Ecorr), corrosion current (Icorr) and polarization resistance (Rp). The coatings obtained presented values of the dilution ranging from 5.8% to 15.01%. The coating that presented lower dilution value, also was the one with lower Icorr and Fe, besides higher Rp and Ecorr, thus, greater corrosion resistance.
RESUMODentre os processos relacionados à manutenção dos equipamentos que operam nas indústrias do petróleo e gás, a soldagem é uma das mais importantes para recuperação de equipamentos de transporte, de armazenamento e de unidades de refino. Uma das aplicações deste processo neste setor é a aplicação de revestimento com ligas de níquel na superfície interna dos dutos para minimizar o efeito da corrosão. Objetivouse neste trabalho avaliar os efeitos dos diferentes parâmetros de soldagem sobre a resistência à corrosão de revestimentos a base de Níquel depositados sobre o aço API 5L Gr B, utilizado na fabricação dos dutos. Os depósitos de solda para obtenção dos revestimentos foram realizados pelo processo MIG variando os parâmetros de soldagem (
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.