Abstract
The addition of superelastic NiTi particles is a great benefit to the toughness of the Ni-P coating. Nonetheless, NiTi nanopowder costs 10 times more than Ti nanopowder. Therefore, in the present study, to reduce the cost, Ni-P-NiTi composite coatings were prepared on AISI 1018 steel substrates by the electroless incorporation of Ti nanoparticles into Ni-P followed by the annealing of Ni-P-Ti coatings. The effect of the formation of a superelastic NiTi phase on static and dynamic corrosion performance was investigated. It was found that the annealed Ni-P-Ti coating (i.e., Ni-P-NiTi coating) has much higher static corrosion resistance than the as-deposited Ni-P coating. The dynamic corrosion rates in the absence of abrasive particles are 10 times higher than the static corrosion rates of the coatings. The dynamic corrosion rates in the presence of abrasive particles are one order of magnitude higher than the dynamic corrosion rates in the absence of abrasive particles. The formation of a superelastic NiTi phase considerably improved the static and dynamic corrosion performance of the Ni-P coating. In the absence of abrasive particles under flowing condition, the dynamic corrosion resistance of the annealed Ni-P-Ti coating (i.e., Ni-P-NiTi coating) is 19 times higher than that of the as-deposited Ni-P coating. In the most aggressive environment (in the presence of abrasive particles), the dynamic corrosion resistance of the annealed Ni-P-Ti coating (i.e., Ni-P-NiTi coating) is four times higher than that of the as-deposited Ni-P coating. The annealed Ni-P-Ti coating (i.e., Ni-P-NiTi coating) can be used in applications where high corrosion resistance is required, especially in an extremely aggressive environment.
Highlights
In the oil and gas industry, material degradation caused by corrosion is a severe problem especially in the presence of abrasive particles [2]
The impacts of abrasive particles produce a strained surface that is highly vulnerable to corrosion due to the high energy of the surface [3]
Under static condition, an oxide passive layer is formed on the surface, which prevents the steels from further corrosion [4]
Summary
In the presence of abrasive particles, the impacts of abrasive particles remove the oxide layer and expose a vulnerable fresh surface to the corrosive environment [5]. Due to these factors, the presence of abrasive particles significantly accelerates corrosion rate. Each of those coatings has their limitations In addition to their low hardness, polymer-based coatings cannot withstand thermal and impact damage during assembly and operation processes [6], and epoxy-based coatings are not capable of resisting certain chemicals in crude oil, especially in the presence of abrasive particles [7]. It is necessary to develop a protective coating that provides the highest protection to the steels against the corrosive environment
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