Development of Hybrid Sol-Gel Coatings on AA2024-T3 with Environmentally Benign Corrosion Inhibitors

Abstract

Aluminium alloys are still considered as one of the primary light alloys with high strength that can be used in aerospace and marine structure with a moderate economic cost. However, aluminium alloys are affected by atmospheric and marine corrosion which reduces their overall reliability. The application of coatings is one of the strategies for mitigating the corrosion on aluminium alloys. Sol-gel technology is one of the coating strategies with potential for excellent chemical and environment stability, providing eco-friendly performance improvement. Sol-gel coatings can enhance corrosion resistance by adopting many corrosion inhibitors that can protect aluminium alloys substrates from corrosion.

The Influence of Adding Silica Fluoroalkylsilane on the Morphology, Mechanical, and Corrosion Resistance Properties of Sol-Gel Derived Coatings

“…Then, a solution of 12-mole % polydimethylsiloxane (PDMS) polymer was added to enhance the sol-gel consistency. Then, the formula was stirred with dropwise nitric acid as a catalytic agent for the last 24 h of hydrolysis and condensation polymerization and was used as the base coating [7]. After that, the base sol-gel formula was then improved by being hybridized with the fluorinated FAS from Sigma-Aldrich by adding 1.5 vol.% to create a FAS-modified sol-gel formula.…”

“…The subsequent Figure 3 shows the Sneddon model with its related equation (Equation ( 1)). This study used AFM nanoindentation to determine the changes in E values for these coating films [7].…”

“…The subsequent Figure 3 shows the Sneddon model with its related equation (Equation ( 1)). This study used AFM nanoindentation to determine the changes in E values for these coating films [7]. where F is the applied load force, which can be determined from the force curve, E is the value of Young's modulus, which can be calculated from the fitted parameters on that force curve, ν is Poisson's ratio depending on the measured sample, typically between Since E is a defined material capacity for tolerating changes in dimension beneath longitudinal compression or tension, this alluded to the coating's ability to change mechanical behaviour, respond to residual stresses, and avoid microcracks from service.…”

“…Furthermore, this approach represents an ecologically sound technical trajectory for producing surface coatings, exhibiting the considerable potential to supplant deleterious pre-treatment coatings such as conventional chromate coatings. Our earlier research developed hydrophobicity to enhance the corrosion resistance of our silicabased sol-gel on aluminium 2024-T3 alloy sintered at 80 • C. This novel silica-based sol-gel coating was created by introducing 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) to the base sol-gel system of triethoxymethylsilane (MTMS) and tetraethylorthosilicatesilane (TEOS) precursors and by strengthening it with a polydimethylsiloxane polymer [7]. This study is considered as continued work in the investigation of the effect of adding FAS to the coating's thin film on its general mechanical and corrosion properties.…”

A Case Study for Implementing a Plant Corrosion Inspection and Maintenance Anomaly and Integrity Management System on the Sabratha Gas Production Offshore Platform in the Mediterranean Sea

“…Notably, the living quarters are located in the top of the platform, make it a riskier place than onshore production units [7]. The offshore platform production system has some characteristics that could increase onboard risks, including dealing with inflammable and explosive materials, high temperatures and high pressures, aggressive corrosion, and rough working conditions [8,9]. Half of these major accidents can be avoided if equipment and facilities are inspected, maintained and managed systematically and strategically [6].…”