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The influence of the ferritic and austenitic phases, and of silicon on the corrosion resistance of alloyed cast steels = Der Einfluß der ferritischen ubd austenitischen Phasen sowie von Silizium auf die Korrosionsbeständigkeit von legiertem Stahlguß
Vehovar, Leopold ; Godec, Boštjan, 1961-
The paper deals with the influence of the ▫${\alpha/\gamma}$▫ phase ratio and silicon on the corrosion resistance of low carbon alloyed cast steels in strongly oxidizing media. Elektrochemical ...investigations in 65% ▫${HNO_3}+5g Cr^{6+}$▫ ions/l showed that none of the four tested cast steels, with ▫${\gamma_R}=100%$▫, ▫${\gamma_R}=75%$▫, ▫${\gamma_R}=50%$▫ and ▫${\gamma_R}=0%$▫, achived a passive state, and that the corrosion process was under cathodic control. Under such conditions the cathodic activation overpotentional is considerably greather than the anodic activation overpotentional, and, as well as this, the Tafel coefficient for cathodic reaction has higher values than those which are characteristic for an anodic reaction. The austenitic cast steel is the most resistant to corrosion, since for the corrosion process to take place the greatest activation energy is needed. The results of investigations of corrosion resistance in 12M ▫$HNO_3$▫, at 115°C, for 240 hours, confirmed the results of the electrochemical measurements and the predominant role of the austenitic cast steel with ▫${\gamma_R}=100%$▫. By means of AES analysis it was found that the good resistance to corrosion of such a cast steel is based on the building up of a thin mechanically-protecting barrier, which mainly consists of silicon.
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