TOZ METALURJİSİ İLE ELDE EDİLEN DÜŞÜK KARBON ÇELİĞİNİN %3.5 NaCl ORTAMINDAKİ KOROZYONUNA NİYOBYUM VE VANADYUMUN ETKİSİ

Abstract

ÖZ THE EFFECT OF NIOBIUM AND VANADIUM ON CORROSION OF LOW CARBON STEEL OBTAINED BY POWDER METALLURGY IN 3.5%NaCl ENVIRONMENT ABSTRACTIn this study, corrosion mechanism of new alloys produced with addition of niobium and vanadium at the ratio of 0.05 wt. % and 0.075 wt. % into chemical composition of reference sample was investigated in 3.5% NaCl environment. The Dynamic Electrochemical Impedance Spectroscopy (DEIS) method allowing instantaneous detection of corrosion mechanism was used for the first time with this study for determining the effect of micro alloy elements on corrosion. Surface morphology of the prepared samples were compared with electrochemical data examined by using optical microscope at the end of 15 hour DEIS experiments. According to experimental results, the increase in amount of niobium and vanadium indicated that produced new alloys decreased corrosion rate occurring in 3.5% NaCl environment. R ct value obtained at the end of experiment show increased averagely at rate of 44-57% with the addition of alloy elements. Obtained DEIS data and optical images support each other. It was observed that there were more corrosion and accordingly deformation on surface of sample without addition of alloy elements.

The Effect of Nickel on the Microstructure, Mechanical Properties and Corrosion Properties of Niobium–Vanadium Microalloyed Powder Metallurgy Steels

“…Therefore, we believe that Tafel description of overall corrosion dynamics should be possible. It seems that addition of Nb and V into pure steel leads to a significant increase of corrosion resistance [33][34][35][36][37]. There are many studies in the literature that say microalloyed steels have good corrosion resistance compared to unalloyed steels.…”

“…There are many studies in the literature that say microalloyed steels have good corrosion resistance compared to unalloyed steels. Uygur et al [33] examined the corrosion properties of unalloyed steel and microalloyed steel with different ratios of Nb-V microalloying elements by powder metallurgy. The results obtained have shown that the corrosion resistance increases almost three times with the addition of 0.075 Nb and V by weight of unalloyed steel.…”

Investigation of microstructure, mechanical and machinability properties of Mo-added steel produced by powder metallurgy method

“…The effect of alloying elements in solution on recrystallization of austenite is not strong. The inhibition of grain boundary progression by precipitated particles is substantially more than the impact of dissolved atoms [31][32][33][34]. From the SEM, EDS, and microstructure results, it was determined that the element Mo was present in solution and as a precipitated particle.…”