Naslov
Studies on the influence of chloride ion concentration on the corrosion behavior of CuAlNi alloy

Autori
Vrsalović, Ladislav ; Čudina, Diana ; Lokas, Lea ; Ivanić, Ivana ; Kožuh, Stjepan ; Gojić, Mirko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Conference Proceedings International Conference MATRIB 2017 / Šolić, Sanja ; Dolić, Natalija - Koprivnica : Sveučilište Sjever, 2017, 274-281

Skup
International Conference MATRIB 2017

Mjesto i datum
Vela Luka, Hrvatska, 28.06.2017. - 02.07.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
shape memory alloy, CuAlNi alloy, corrosion, electrochemical methods, SEM/EDS analysis

Sažetak
This paper presents the results of corrosion investigation of cast CuAlNi, in 0.1 %, 0.5 %, 0.9 % and 1.5 % NaCl solution (pH = 7.4 and T = 37 oC). Electrochemical investigations were performed by open circuit potential measurements, linear and potentiodynamic polarization measurements. After polarization measurements, electrode surfaces were investigated by optical microscope and with SEM/EDS analysis. The results of electrochemical investigations has shown that increasing the concentration of chloride ions leads to increase of the corrosion current density values and decrease of the polarization resistance values which indicated the higher corrosion attack on alloy. Investigation of alloy surface by optical microscope has shown that there is no indication of pitting corrosion in 0.1 % NaCl solution. SEM/EDS analyses have confirmed results of optical microscopy analysis. The largest numbers of pits were found on CuAlNi electrode surface after investigations in 0.9 % NaCl solution, while the largest pits diameters were found in investigations in 1.5% NaCl solution. EDS analysis have shown that the dominant percentage of copper and oxygen on CuAlNi surface, which indicated the existence of copper oxide on electrode surface. The presence of a small percentage of aluminium indicates its distribution in the form of aluminium oxide in the surface layer.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Metalurgija

POVEZANOST RADA