Electrochemical and Microstructural Analysis of FeS Films from Acidic Chemical Bath at Varying Temperatures, pH, and Immersion Time

Abstract

The corrosion resistance and corrosion products of 4130 alloy steel have been investigated by depositing thin films of iron sulfide synthesized from an acidic chemical bath. Tests were conducted at varying temperatures (25 ∘ C-75 ∘ C), pH levels (2-4), and immersion time (24-72 hours). The corrosion behavior was monitored by linear polarization resistance (LPR) method. X-ray Diffraction (XRD), Energy Dispersive X-ray (EDX) spectroscopy, and Scanning Electron Microscopy (SEM) have been applied to characterize the corrosion products. The results show that, along with the formation of an iron sulfide protective film on the alloy surface, increasing temperature, increasing immersion time, and decreasing pH all directly increase the corrosion rate of steel in the tested experimental conditions. It was also concluded that increasing temperature causes an initial increase of the corrosion rate followed by a large decrease due to transformation of the iron sulfide crystalline structure.

Nanosecond Laser Fabrication of Hydrophobic Stainless Steel Surfaces: The Impact on Microstructure and Corrosion Resistance

“…It is a common problem especially in highly aggressive environments [ 2 ], degrading the integrity and lifetime of metal surfaces and causing problems both economically and operationally in engineering applications. External factors such as salinity [ 3 ], temperature [ 4 ], pH [ 2 ] and pollutants [ 5 ] influence the rate of corrosion of materials. Fabrication processes such as welding [ 6 ] and heat treatment [ 7 ] can also affect the corrosion resistance of the metal.…”

Analysis of Localized Corrosion on Stainless Steel

“…In the deficiency of sulfide (0 bar pH 2 S), metal oxide layer formed and averting the direct contact between the 2205 DSS substrate and solution [4]. At 3 bar pH 2 S, a sulfide layer formed but corrosion rate was increased [15]. At 15 bar pH 2 S, a sulfide layer become more prominent and lower the pit penetration and corrosion rates.…”

Effect of Elemental Sulfur and Sulfide on the Corrosion Behavior of Cr-Mo Low Alloy Steel for Tubing and Tubular Components in Oil and Gas Industry

“…In the first series of experiments, all of the tests were carried out in a multi-port glass cell, which was filled with solved thioacetamide (2 M) in 420 mL de-ionized water. According to the literature and the authors’ previous studies [ 9 , 10 ], the addition of thioacetamide into the water would produce free sulfide ions through the bulk solution. Decomposition of thioacetamide is an irreversible reaction that has been considered as the sulfur source, generating S 2− by a hydrolytic method [ 11 , 12 , 13 , 14 ].…”