Corrosion resistance of steel Cr20Ni20 with variable contents of phosphorus and silicon in nitric acid

• Autorzy: Číhal V. , Krhutová Z. , Lasek S. , Blahetová M. , Hubáčková J.
• Konferencja: Metody oceny struktury oraz własności materiałów i wyrobów / sympozjum (XVIII ; 25-27.11.2003 ; Svratka, Czechy)
• Języki publikacji: EN

Abstrakty

EN

Segregation of phosphorus and silicon at the grain boundaries in austenitic stainless steels is known to make these steels susceptible to intergranular corrosion in strongly oxidizing environments. This behavior is more pronounced in steels containing phosphorus and normal contents of silicon, other conditions being equal. Considering the interrelationship between the changes in the relative free energy of the grain boundaries and the susceptibility to intergranular corrosion of high-purity austenitic stainless steels in HNO3+Cr6+ [1,2], associated with silicon, it would be of interest to evaluate the effect of phosphorus on the grain boundary energy in the steels of interest, booth with and without silicon, and to correlate this effect with the corrosion resistance of grain boundaries. The undesirable effect of phosphorus in these steels on the resistance of their grain boundaries in 27 % solution of HNO3+40 g.l-1 Cr6+ [3], can be eliminated by adding silicon in quantities ł2 % Si. The present paper shows the findings obtained during the research into the effect of the accompanying elements and silicon on the corrosion and electrochemical behavior of steel Cr20Ni20 with variable contents of phosphorus when exposed to nitric acid.

Słowa kluczowe

EN

Cr20Ni20 steel; corrosion; nitric acid

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Mechanika / Politechnika Opolska
• Rocznik: 2003
• Tom: z. 76
• Strony: 43--49
• Opis fizyczny: Bibliogr. 5 poz., rys., tab., wykr.

Twórcy

autor

Číhal V.

• VŠB - Technical University of Ostrava, Czechy

autor

Krhutová Z.

• VŠB - Technical University of Ostrava, Czechy

autor

Lasek S.

• VŠB - Technical University of Ostrava, Czechy

autor

Blahetová M.

• VŠB - Technical University of Ostrava, Czechy

autor

Hubáčková J.

• VŠB - Technical University of Ostrava, Czechy

Bibliografia

• [1] DESESTRET, A., FROMENT, M., GUIRALDENG, P.: Mem. Sci., Rev. Met., 66, 1969, 389.
• [2] ASSASSA, W., GUIRALDENG, P.: Mem. Sci., Rev. Met., 75, 1978, 123.
• [3] KASPAROV A, O. V. et al.: Zashchita metallov, 18, 1982, 336.
• [4] MURR, L. E.: Acta Met., 16, 1969, 1128.
• [5] KUDRMAN, J. et al.: Metal materials. 10,1972,401.