Effect of nickel-based laser coatings on phase composition and corrosion behaviour of titanium alloy for offshore application

Abstract

Recent advances in titanium alloy applications in the offshore industry have been realized through the development of laser surface modification technique. The distinctive outcome of this technique has provided increase in the utilization of titanium in offshore drilling risers for special drilling operations and various subsea and tubing applications. In this work, surface mitigation and corrosion degradation of titanium alloy in aggressive sulfuric acid were investigated using electrochemical technique (linear potentiodynamic polarization) while the surface characterization (morphology) and phases of the resultant coatings were analyzed using X-ray diffractometry (XRD) and scanning electron microscopy (SEM). Prior to that, laser surface technique was used to fabricate Nickel-based powder on the substrate (Ti-6Al-4V). Results revealed that laser clad sample with high scan speed was more effective in improving the corrosion resistance compared to low scan speed. The enhanced corrosion resistance with high laser scan speed has been attributed to the presence of hard intermetallic compounds in the metallic coating.

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

“…They indicated that the use of an interlayer that acts as a transition material could significantly reduce these reported cracks. Adesina et al [125], in agreement with Pardal et al [126], elucidated further that such intermetallics and reactive oxides experienced during deposition can influence the corrosion behaviour of coatings and even hinder the joining of materials. On the other hand, it is worth noting that some intermetallics have good properties such as NiTi intermetallics having good corrosion resistance, wear, and oxidation resistance [127].…”

Microstructure and Wear Property of Graphene Nanoplatelets Reinforced Nickel-Based Composite Coating by Laser Cladding

“…Nickel-based alloy coatings are widely used in marine, chemical, nuclear industry and machinery fields owing to their toughness, strong oxidation resistance and high corrosion resistance [8]. Given the rapid development of industrialization and the complicated operating environment, it is important that the wear resistance of the coatings, especially for the service life of minerals machinery, is developed further.…”