Electrochemical aspects of molten-salt-enhanced corrosion

Hot corrosion resistance of Ni and Ni-base superalloys

“…2. The activation potential, which is proposed as a measure of resistance of a material to acidic fluxing [9] is higher in the alloys more resistant to hot corrosion in terms of Icorr values after anodic galvanostatic treatment, in agreement with the work by Erdos et al [5]. The same trend is seen in the stabilized potential (a measure of resistance of a material to basic fluxing) measured in the same way after cathodic galvanostatic treatment.…”

“…The increase in Ioo~r for these superalloys IN-100 and IN-713LC after galvanostatic polarization is attributed to the effect of basicity change of the melt after polarization. In general, the melt becomes more basic by cathodic treatment and more acidic by anodic treatment [8,9]. Since the solubility of oxide" scale is higher in both the more basic and more acidic melts compared with neutral melts, the Icorr value is expected to be increased after galvanostatic treatment.…”

Monitoring the Degradation Process of Inconel 600 and its Aluminide Coatings under Molten Sulfate Film with Thermal Cycles by Electrochemical Measurements

“…Since the molten salts are electrolytes, electrochemical methods are considered to be very useful for understanding the corrosion mechanism and monitoring the changes in corrosion resistance of alloys and protective coatings. Many researchers have done a lot work on hot corrosion with electrochemical methods but most of the experiments were conducted under bulk molten salt condition [2][3][4] . However, molten salt exists as a thin film on metallic materials under practical industrial environment.…”

Aluminizing and boroaluminizing treatments of Mar-M247 and their effect on hot corrosion resistance in Na2SO4−NaCl molten salt

“…The reason was thought to be the fact that the complete removal of the aluminized layer beyond the 20th cycle, caused by repeated oxidation and thermal shock during the oxidation, made it possible for the bare material and Na 2 SO 4 -NaCl molten salt to react directly with each other [19][20][21].…”