Laser processing of nickel–aluminum bronze for improved surface corrosion properties

Abstract

Nickel–aluminum bronze was subjected to laser heating to change the microstructure on the surface for enhanced corrosion performance. To develop the laser processing parameters, a two-phase diffusion model was used to determine the phase transformation kinetics. Also, an analytical laser heating model was employed to determine the laser power setting required to process just below the melting point. The result was that the lamellar κIII phase of the as-cast microstructure was dissolved up to 1.3 mm deep. Electrochemical testing revealed an increase in the corrosion potential and hence improved corrosion resistance for the laser processed surface, supporting the use of this process for enhanced corrosion performance of nickel–aluminum bronze components.

Wire-arc additive manufacturing of nickel aluminum bronze/stainless steel hybrid parts – Interfacial characterization, prospects, and problems

“…In the literature, few works reported on laser surface modification techniques such as surface melting and cladding for the repair of cast NAB alloy components [13][14][15][16][17][18] . However, minimal work is published on arc (weld) deposition of NAB [ 19 , 20 ], that too on a cast-NAB (similar composition) substrate.…”

A review of the corrosion behavior of conventional and additively manufactured nickel–aluminum bronze (NAB) alloys: current status and future challenges

“…These findings were further supported using various corrosion tests. 104 In a similar study, 105 the improved corrosion resistance of NAB alloy surface treated via laser heating was ascribed to the dissolution of k III and redistribution of Al in the solidstate solution.…”

“…However, exceeding the critical intensity results in more severe corrosion due to rougher surface and higher effective surface area. Similarly, laser surface processing techniques have been found to promote either passivity 104,105 or hydrophobicity 106 of the alloy, leading to improved corrosion resistance. Ion implantation has been explored as an alternative method to inhibit corrosion by manipulating the semi-conducting behavior of the resulting oxide film 108 or its structure.…”

Thermal fatigue behavior of Mg–9Al–Zn alloy with biomimetic strengthening units processed by laser surface remelting

“…In this regard, the advantages of laser surface processing are obvious. The microstructure on the surface of nickel-aluminum bronze was modified through surface treatment [11] in which the detrimental phase in the microstructure was dissolved and the corrosion resistance was thereby enhanced.…”