The wet corrosion of molybdenum thin film –. Part I: Behavior at 25°C

Abstract

The corrosion and passivation behaviour of molybdenum thin films obtained by Physical Vapor Deposition (PVD) was investigated in aerated chloride and sulfate solutions at different pH values. Open circuit potential (ocp) measurements, polarisation experiments and electrochemical impedance spectroscopy (EIS) were employed. The experimental results suggest that the metal surface is covered by a passive film; however, corrosion still occurs. For the samples assessed during the current research, the acidic electrolytes tended to be less corrosive; however, a limited passive region was associated with the most basic sulfate or chloride solution. The effect of the pH was found to be more pronounced than the effect of the ion (chloride or sulfate).

The wet corrosion of molybdenum thin film – Part III: The effect of Ti and Nb

“…As presented previously [1,2], molybdenum is a potential material for many thin film applications in different fields such as protective coatings of nuclear materials [3], solar cells [4], back contact in thin film solar cells [5,6] and microelectronics [7]. All these applications are due to the physical chemistry properties of Mo.…”

“…The corrosion resistance was investigated at ambient temperature in an aqueous aerated chloride solution having a pH of 12. An alkaline solution was selected for the following two reasons: (a) previous research indicated that Mo corrosion is more severe at a higher pH value [1] and; (b) the high pH solution more closely resembles the microenvironment of undercoating corrosion (Fig. 1).…”

The wet corrosion of Mo and Mo-Ti alloy thin film - Part IV: The effect of nitriding

“…An aerated alkaline solution was selected for the following two reasons: (a) previous research indicated that Mo corrosion is more severe at a higher pH value [25,26], and (b) the high pH solution more closely resembles the microenvironment of undercoating corrosion. Therefore pH 12 can be considered as the most suitable for studying undercoating corrosion and the most aggressive for Mo alloy thin films.…”

The wet corrosion of molybdenum thin film – Part II: Behavior at 85°C

“…As reported in Part I [24] of this research work, molybdenum thin films are employed in different industrial domains for the production of high value added devices. The corrosion resistance of these thin films is a major concern when devices are designed.…”

“…In the first part of this work [24], the corrosion behavior of Mo thin film produced by Physical Vapour Deposition was Materials and Corrosion 2004, 55, No. 9 Wet corrosion of molybdenum thin film investigated at 25 8C in aerated chloride and sulfate solutions.…”