Corrosion Behaviour of 316L Stainless Steel in CNTs–Water Nanofluid: Effect of Temperature

The inhibition behavior of carbon nanotubes (CNTs) and Gum Arabic (GA) on the corrosion of 316L stainless steel in CNTs–water nanofluid under the effect of different temperatures was investigated by electrochemical methods and surface analysis techniques. Thereby, 316L stainless steel samples were exposed to CNTs–water nanofluid under temperatures of 22, 40, 60 and 80 °C. Two concentrations of the CNTs (0.1 and 1.0 wt.% CNTs) were homogenously dispersed in deionized water using the surfactant GA and tested using three corrosion tests conducted in series: open circuit test, polarization resistance test, and potentiodynamic scans. These tests were also conducted on the same steel but in solutions of GA-deionized water only. Tests revealed that corrosion increases with temperature and concentration of the CNTs–water nanofluids, having the highest corrosion rate of 32.66 milli-mpy (milli-mil per year) for the 1.0 wt.% CNT nanofluid at 80 °C. In addition, SEM observations showed pits formation around areas of accumulated CNTs that added extra roughness to the steel sample. The activation energy analysis and optical surface observations have revealed that CNTs can desorb at higher temperatures, which makes the surface more vulnerable to corrosion attack.

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Effect of temperature, chloride and dissolved oxygen concentration on the open circuit and transpassive potential values of 316L stainless steel at high-temperature pressurized water

Nuclear Engineering and Design ◽

10.1016/j.nucengdes.2017.06.048 ◽

2017 ◽

Vol 322 ◽

pp. 215-226 ◽

Cited By ~ 5

Author(s):

Farzin Arjmand ◽

Lefu Zhang ◽

Jiamei Wang

Keyword(s):

Stainless Steel ◽

High Temperature ◽

Dissolved Oxygen ◽

Oxygen Concentration ◽

316L Stainless Steel ◽

Open Circuit ◽

Effect Of Temperature ◽

Dissolved Oxygen Concentration ◽

Pressurized Water

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Corrosion Behaviour of Type 316L Stainless Steel in Hot Caustic Aqueous Environments

Metals and Materials International ◽

10.1007/s12540-019-00403-2 ◽

2019 ◽

Vol 26 (5) ◽

pp. 630-640 ◽

Cited By ~ 2

Author(s):

Raul Davalos Monteiro ◽

Jan van de Wetering ◽

Benjamin Krawczyk ◽

Dirk L. Engelberg

Keyword(s):

Stainless Steel ◽

Room Temperature ◽

316L Stainless Steel ◽

Open Circuit Potential ◽

Corrosion Behaviour ◽

Open Circuit ◽

Corrosion Rates ◽

Aqueous Environments ◽

Type 316L ◽

Type 316L Stainless Steel

Abstract The corrosion behaviour of type 316L stainless steel in aqueous 30–50 wt%. NaOH at temperatures up to 90 °C has been elucidated. Exposure to room temperature environment showed parabolic weight loss behaviour, with corrosion rates of up to 0.4 mm/year. Higher NaOH concentrations and exposure temperatures resulted in a reduced stability of the electrochemical passivity domain, associated with higher corrosion rates. Exposure to de-aerated 50 wt%. NaOH presented corrosion rates of up to 0.5 mm/year at open circuit potential, with maximum corrosion rates under polarisation of up to ≈ 18 mm/year. The formation of a dark iron-oxy-hydroxide and nickel-oxide was observed, with exposure to temperatures in excess of 50 °C. The behaviour of type 316L stainless steel in hot caustic environment is compared to types 204, 304, 2205 stainless steel, and nickel alloy 200. Graphic Abstract

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Structure and corrosion behaviour of nanocrystalline cobalt-molybdenum alloys electrodeposited on 316L stainless steel

Annales de Chimie Science des Matériaux ◽

10.3166/acsm.39.167-174 ◽

2015 ◽

Vol 39 (3-4) ◽

pp. 167-174

Author(s):

Michal Latkiewicz ◽

Halina Krawiec ◽

Vincent Vignal ◽

Paulina Erazmus-Vignal

Keyword(s):

Stainless Steel ◽

316L Stainless Steel ◽

Corrosion Behaviour ◽

Molybdenum Alloys

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Corrosion Evaluation of 316L Stainless Steel in CNT-Water Nanofluid: Effect of CNTs Loading

Materials ◽

10.3390/ma12101634 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1634 ◽

Cited By ~ 4

Author(s):

Dana H. Abdeen ◽

Muataz A. Atieh ◽

Belabbes Merzougui ◽

Walid Khalfaoui

Keyword(s):

Stainless Steel ◽

Corrosion Rate ◽

316L Stainless Steel ◽

Tap Water ◽

Gum Arabic ◽

Corrosion Performance ◽

Free Energy Of Adsorption ◽

Sem Images ◽

Pitting Potential ◽

Water Solutions

Polarization resistance and potentiodynamic scan testing were performed on 316L stainless steel (SS) at room temperature in carbon nanotube (CNT)-water nanofluid. Different CNT loadings of 0.05, 0.1, 0.3 and 0.5 wt% were suspended in deionized water using gum arabic (GA) surfactant. Corrosion potential, Tafel constants, corrosion rates and pitting potential values indicated better corrosion performance in the presence of CNTs with respect to samples tested in GA-water solutions. According to Gibbs free energy of adsorption, CNTs were physically adsorbed into the surface of the metal, and this adsorption followed Langmuir adsorption isotherm type II. Samples tested in CNT nanofluid revealed a corrosion performance comparable to that of tap water and better than that for GA-water solutions. Among all samples tested in CNT nanofluids, the lowest corrosion rate was attained with 0.1 wt% CNT nanofluid, while the highest value was obtained with 0.5 wt% CNT nanofluid. At higher CNT concentrations, accumulated CNTs might form active anodic sites and increase the corrosion rate. SEM images for samples of higher CNT loadings were observed to have higher pit densities and diameters.

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