Effect of the Crevice Former on the Corrosion Behavior of 316L Stainless Steel in Chloride-Containing Synthetic Tap Water

The effect of rare earth oxides on the microstructure and corrosion behavior of laser-cladding coating on 316L stainless steel was investigated using hardness measurements, a polarization curve, electrochemical impedance spectroscopy (EIS), a salt spray test, X-ray diffraction, optical microscopy, and scanning electron microscopy (SEM). The results showed that the modification of rare earth oxides on the laser-cladding layer caused minor changes to its composition but refined the grains, leading to an increase in hardness. Electrochemical and salt spray studies indicated that the corrosion resistance of the 316L stainless steel could be improved by laser cladding, especially when rare earth oxides (i.e., CeO2 and La2O3) were added as a modifier.

Download Full-text

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.

Download Full-text

Influence of Electromagnetic Treatment on Corrosion Behavior of Carbon Steel and 316L Stainless Steel in Simulated Cooling Water

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.3135 ◽

2011 ◽

Vol 347-353 ◽

pp. 3135-3138

Author(s):

Hong Hua Ge ◽

Jie Ting Tao ◽

Xiao Ming Gong ◽

Cheng Jun Wei ◽

Xue Min Xu

Keyword(s):

Stainless Steel ◽

Carbon Steel ◽

Corrosion Behavior ◽

316L Stainless Steel ◽

Cooling Water ◽

Stainless Steel Electrode ◽

Transfer Resistance ◽

Steel Electrode ◽

Pitting Potential ◽

Electromagnetic Treatment

Abstract: The effect of electromagnetic treatment on corrosion behavior of carbon steel and stainless steel in simulated cooling water was investigated by electrochemical impedance spectroscopy, potentiodynamic polarization techniques and water analysis. It was found that the charge transfer resistance decreased and the corrosion current density increased after electromagnetic treatment for carbon steel electrode, which shows that such treatment promotes corrosion of carbon steel in simulated cooling water. In contrast, the pitting potential of 316L stainless steel electrode rose which revealed that electromagnetic treatment of the experimental water exhibited corrosion inhibition to 316L stainless steel. Reasons for different corrosion behavior of the two metals were discussed.

Download Full-text