Abstract
The corrosion properties of duplex stainless steel type SAF 2205 after long-term ageing at 300°C and 400°C were investigated. However, these steels show a degradation of their properties as submitted by long time, in low temperatures about 280 to 520°C. This work describes this behavior by analysis of the resistance to general corrosion of the SAF 2205 steel ageing in the temperatures 300°C and 400°C, during 2000, 3000 and 5000 h, for sample aged at 400°C for 5000 h. The experimental techniques used were the potential dynamic curves (EPR-Double Loop), scanning and transmission electronic microscopy for microstructure analysis and weight loss test. It is verified that the ageing treatments modify the corrosion resistance due to microstructural changes of precipitation in the matrix and not by precipitation in grain boundaries (sensitization). However the sample aged at 400°C for 5000 h, due to the precipitation of phases G and α’, showed an appreciable increase in the loss of mass. Key words: ageing, precipitation, corrosion, weight loss, EPR.
Highlights
The combination of individual properties of each of the phases of the duplex stainless steel, ensure greater use and replacement of conventional stainless steels for these materials
It is known that these materials when subjected to a temperature range of 280 to 520°C according to Ghosh et al (2008), suffer loss of toughness and effects of loss of resistance corrosion when treated for times of the order of 100 h at intermediate temperatures around 475°C have been studied and assigned to the precipitation phase ' in the ferritic matrix second (Iacoviello et al, 2005)
This study aims to identify the behaviors of corrosion resistance duplex steel type SAF 2205 as mentioned by Zhang et al (2009) ageing for long times by comparative electrochemical techniques and immersion
Summary
The combination of individual properties of each of the phases of the duplex stainless steel (austenite and ferrite), ensure greater use and replacement of conventional stainless steels for these materials. These steels have been recommended for applications in chemical and petrochemical plants, pulp and paper reports. This is certainly due to the characteristics of good mechanical strength, weldability and machinability coupled with good resistance corrosion of these steels in normal use. This study aims to identify the behaviors of corrosion resistance duplex steel type SAF 2205 as mentioned by Zhang et al (2009) ageing for long times by comparative electrochemical techniques and immersion
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