Abstract
Pitting corrosion resistance and intergranular corrosion of the austenitic stainless steel X5Cr Ni18-10 were tested on the base metal, heat affected zone and weld metal. Testing of pitting corrosion was performed by the potentiodynamic polarization method, while testing of intergranular corrosion was performed by the method of electrochemical potentiokinetic reactivation with double loop. The base metal was completely resistant to intergranular corrosion, while the heat affected zone showed a slight susceptibility to intergranular corrosion. Indicators of pitting corrosion resistance for the weld metal and the base metal were very similar, but their values are significantly higher than the values for the heat affected zone. This was caused by reduction of the chromium concentration in the grain boundary areas in the heat affected zone, even though the carbon content in the examined stainless steel is low (0.04 wt. % C).
Highlights
Intergranular corrosion and pitting corrosion are forms of localized corrosion that often occur in welded joints of austenitic stainless steels
The aim of this paper is to examine pitting corrosion resistance in the heat affected zone (HAZ) of welded joints in an austenitic stainless steel
It can be seen that the value of reactivation charge density Qr is lower on the base metal (Figure 1a) than in the heat affected zone of welded joint (Figure 1b)
Summary
Intergranular corrosion and pitting corrosion are forms of localized corrosion that often occur in welded joints of austenitic stainless steels. Intergranular corrosion occurs as dissolution of grain boundaries. At slow cooling of welded joints of austenitic stainless steels in the temperature range from 420 to 820 °C, carbides rich in chromium, preferably M23C6 [1,2,3], are precipitated. The actual formula of carbide M23C6 is
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