Effect of quenching in aqueous polyvinylpyrrolidone solutions on the microstructure and pitting corrosion resistance of AISI 1045 carbon steel

Abstract

Carbon steels are widely used as infrastructure components owing to their high strength, ductility, and weldability. However, as corrosion degrades critical infrastructure components, exploring the relationship between the microstructure and corrosion resistance of carbon steel is of particular interest in engineering. To analyze this relationship, it is first essential to evaluate the corrosion resistance of each microstructure in a carbon steel specimen with a single chemical composition to eliminate the effects of alloying elements. In this study, we compared the pitting corrosion resistance of four microstructures (water-quenched martensite, tempered martensite, bainite and degenerate pearlite, and ferrite-pearlite) of an AISI 1045 medium-carbon steel. The pitting corrosion resistances of the microstructures in near-neutral pH solutions containing NaCl were ordered as follows: (high) water-quenched martensite > bainite and degenerate pearlite > tempered martensite > ferrite-pearlite (low). Elucidating the effect of the microstructure on the pitting corrosion resistance may contribute to the development of corrosionresistant carbon steels with excellent mechanical properties.

Effect of Multi-walled Carbon Nanotube and Polyethylene Glycol Addition in Nanofluid Quench Medium for Steel Heat Treatment Application

“…Microhardness result suggested that the brighter area was the Martensite phase, while the darker area was the Bainite phase. This interpretation was in line with a similar microstructure reported by Nishimoto (Nishimoto et al, 2022). For comparison, the microstructure of the steel with the lowest and highest hardness after quenched in nanofluid are presented in Figure 5a and 5b, respectively.…”

Comparison of wet and dry milling on carbon biomass as dispersed particle in quench medium for steel heat treatment application

“…After annealing and quenching in the distilled water, the steel phase transforms into a combination of Bainite, Martensite, and Pearlite (figure 10(a)). This microstructure appearance of the S45C carbon steel is similar to the literature from Nishimoto [42]. Vickers microhardness testing was conducted on the quenched samples, specifically on the bright and dark phases, to validate the microstructure observation further.…”

Vanadium-Doped Induction of Bare Active Crystalline Planes of Tungsten Oxide and Its Excellent Anticorrosion Properties

“…As shown in Table for the polarization parameters of the coatings, the absolute value of β c for the VW complex coating was significantly lower than that of the epoxy resin coating, which indicates that the corrosion inhibitor achieved corrosion prevention mainly through inhibition of the cathodic reaction. Generally speaking, in a neutral environment, the main corrosion reaction was oxygen absorption corrosion, , and the exposed active (110) crystalline plane in the VW compound had a higher plane energy, which gave a higher reactivity to oxygen defects, and was conducive to the capture of O 2 and H 2 O to form hydroxyl groups, which would compete with the cathode, thus effectively inhibiting the occurrence of the cathodic reaction and playing an anticorrosion effect.…”

“…The resistance was the polarization resistance (R p ) when the polarization current was 0. The higher the value of R p was, the lower the corrosion rate 35 and the more difficult the corrosion reaction. In the R p diagram of Figure 6b−f, the polarization resistances of the epoxy, WO 3 , VW1, VW2, and VW3 coatings are 1806, 1812, 2679, 8497, and 4140 ohm•cm 2 , respectively, and the polarization resistance of the VW2 coating is 4.7 times that of the pure epoxy coating, thereby indicating that the corrosion rate of the iron substrate was slowest under the protection of the VW2 coating and that the VW2 coating provided the best corrosion protection, which was consistent with the conclusions given by I corr .…”