Corrosion behavior of surface induced by wire EDM on 316L stainless steel: an experimental investigation

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.

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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.

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A Comparison of the Effects of Wire Electrical Discharge Machining Parameters on the Processing of Traditionally Manufactured and Additively Manufactured 316L Stainless Steel Specimens

Volume 2: Advanced Manufacturing ◽

10.1115/imece2018-88014 ◽

2018 ◽

Author(s):

Gregory Bicknell ◽

Guha Manogharan

Keyword(s):

Surface Roughness ◽

Stainless Steel ◽

316L Stainless Steel ◽

Machining Parameters ◽

Wire Edm ◽

Machining Time ◽

Pulse On Time ◽

Pulse Off Time ◽

Off Time ◽

Time Pulse

Wire electric discharge machining (EDM) is a non-traditional machining method that has the ability to machine hard, conductive materials, with no force and high precision. This technology is used in industries, like the aerospace industry, to create precision parts used in high stress applications. Wire EDM is also commonly used in additive manufacturing (AM) applications to remove printed parts from the base-plates onto which they are printed. Numerous studies show the effects of EDM parameters, like pulse-on time, pulse-off time, and cutting voltage, on the processing of traditionally fabricated metal parts. However, very few studies identify how the parameters of wire EDM affect the processing of AM parts. This paper studies the effect of wire EDM pulse-on time, pulse-off time, and cutting voltage on the machining time, surface roughness, and hardness of additively manufactured 316L stainless steel cylinders. The effects of these wire EDM parameters are then tested on the machining time, surface roughness, and hardness of wrought 316L stainless steel cylinders. It was found that machining time of AM samples was statistically significantly lower than wrought samples and also had better surface finish and lower surface hardness.

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