ANÁLISE DO COMPORTAMENTO CORROSIVO EM MEIO ÁCIDO DO AÇO API5L-X65 SOB DIFERENTES CONDIÇÕES DE DEFORMAÇÃO PLÁSTICA
ANALYSIS OF CORROSIVE BEHAVIOR IN ACID MEDIUM OF API5LX65 UNDER DIFFERENT CONDITIONS OF PLASTIC DEFORMATION
Mariana Cristina de Oliveira, Rodrigo Monzon Figueredo, Roberto Zenhei Nakazato, Heloisa Andréa Acciari, Eduardo Norberto Codaro
Resumo
O aço API 5L X65 é amplamente utilizado para a transferência do petróleo estabilizado e do gás natural processado. Devido às longas distâncias que as tubulações devem percorrer, estas ficam sujeitas às irregularidades do relevo tanto em terra como no mar como também às características naturais do meio onde operam. As principais causas de ruptura em tubulações são atribuídas a deslizamentos de terra ou areia, flambagem, fadiga e corrosão. Neste contexto, estudou-se a corrosão deste aço à temperatura ambiente quando deformado plasticamente. Para tanto, amostras retiradas de um tubo foram tracionadas e deformadas plasticamente de 0,5 a 2,5% e caracterizada a microestrutura. A partir dos ensaios eletroquímicos de corrosão em solução NACE 177-A concluiu-se que a deformação plástica não modifica significativamente o mecanismo e a velocidade de corrosão, mas torna este aço mais suscetível à fragilização pelo hidrogênio nas condições adotadas neste trabalho
Palavras-chave
Abstract
The API 5L X65 steel is widely used for the transfer of stabilized petroleum and processed natural gas. Due to the long distances that the pipes must travel, they are subject to irregularities of terrestrial and maritime relief, as well as to the natural characteristics of the environment in which they operate. The main causes of pipe rupture are attributed to landslides or sand, buckling, fatigue and corrosion. In this context, the corrosion of API5LX65 steel under different plastic deformation conditions was studied at room temperature. For this purpose, samples taken from a tube were extracted and plastically deformed from 0.5 to 2.5%, and then their microstructures were characterized. It was concluded from the electrochemical corrosion tests in NACE 177-A solution that the plastic deformation does not significantly modify the mechanism and the corrosion rate, but this steel becomes more susceptible to the embrittlement by hydrogen in the conditions of this work.
Keywords
Referências
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