New Highly Microbial-Induced Corrosion-Resistant Ni-P-Based Coating with Superior Mechanical Properties.

Abstract

Microbiologically Influenced Corrosion (MIC) has been recognized as a widespread problem in the oil and gas industries because it causes substantial economic losses. Sulfate reducing bacteria (SRB) is one of the essential microorganisms families that have always been linked to MIC mechanisms causing localized corrosion problems. Since the bacterial adhesion on the metal surfaces is a prerequisite condition for the biofilm formation, controlling, and prevention of the colonization/proliferation of the microbial biofilms is of the critical impact regarding the MIC prevention and ensuring the public safety. Titanium-nickel shape memory alloy (TiNi SMA) nanoparticles have several marvelous features, ranging from the physical and chemical properties to the biological performance. Our electroless-plated NiP-TiNi nanocomposite coating (NiP-TiNi NCC) is used to determine the suitability of using it as an inhibition system for SRB on carbon steel (CS). The influence of anaerobic bacteria SRB on the corrosion behavior of API X80 CS, NiP, and NiP-TiNi coatings in simulated seawater was studied by electrochemical impedance spectroscopy (EIS) after different periods of incubation time (7, 10, 14, 21, 28 days). The corrosion products and biofilm formation of the incubated specimens’ surfaces after 7, 10, and 28 days of incubation are checked using the scanning electron microscope (SEM) and X-ray photoelectron spectroscopy. EIS results revealed that the antimicrobial performance of the NiP-TiNi NCC is more efficient compared to the TiNi-free coating that has an inhibition efficiency of 87.5 % after 28 days of incubation time with SRB. Furthermore, SEM, EDS and XPS results confirm that negligible corrosion occurrs for the coated surfaces. Also, The mechanical properties of this coating was proved be superior compared to the Carabon steel and the NiP-based coatings.