Electrochemical studies on the effect of residual stress on the corrosion of 316L manufactured by selective laser melting

https://tigerprints.clemson.edu/cgi/viewcontent.cgi?article=1031&context=civileng_pubs

The influence of incorporation of Mn on the pitting corrosion performance of CrFeCoNi High Entropy Alloy at different temperatures

Comprehending the role of individual microstructural features on electrochemical response and passive film behaviour in type 304 austenitic stainless steel

In the present work, the electronic properties of the passive films formed on equiatomic CoCrFeNi and CoCrFeNiAl high-entropy alloys were investigated in sodium chloride solution. The point defect model (PDM) was employed to study the effect of aluminum addition on the transport of p-type or n-type dopants through the passive films. The crystalline structure of the alloys was determined by X-ray diffraction. CoCrFeNi alloy was comprised of one single face-centered cubic crystalline phase. Aluminum addition promoted the formation of a mixed B2 and BCC structure. X-ray photoelectron spectroscopy (XPS) analysis allowed the examination of the correlation between passive film composition and their electronic properties. The major species in the passive film of the CoCrFeNi alloy were Cr2O3 and Cr(OH)3 while Al2O3 and Al(OH)3 were the predominant species in that of the Al-containing alloy. Electrochemical impedance spectroscopy (EIS) was employed to evaluate the corrosion resistance of the alloys. Aluminum addition promoted the formation of a thicker and more defective passive film. The pitting corrosion susceptibility of the HEAs was dependent on the passive film composition and increased with Al addition. The predominance of n-type defects in the passive film of the CoCrFeNiAl alloy was enhanced upon Al addition. Interaction between passive film composition and the electronic properties of the film played a central role in the corrosion resistance of the high entropy alloys.

Electronic properties of the passive films formed on CoCrFeNi and CoCrFeNiAl high entropy alloys in sodium chloride solution

Corrosion and tribo-corrosion behaviors of nano-lamellar Ni1.5CrCoFe0.5Mo0.1Nbx eutectic high-entropy alloy coatings: The role of dual-phase microstructure

An electrochemical study on the effect of stabilization and sensitization heat treatments on the intergranular corrosion behaviour of AISI 321H austenitic stainless steel

The influence of sensitisation heat treatment, surface roughness and repetitive cyclic voltammetry (RCV) procedure (that was used to create passive films on the surface of sensitised samples) on th...

The effect of surface modification on the corrosion protection ability of the passive films of sensitized UNS S31803 duplex stainless steel

A survey on the passivity of tempered AISI 420 martensitic stainless steel

Perspective on the passivity of Ti6Al4V alloy in H2SO4 and NaOH solutions

This article deals with the electrochemical behavior of passive films that were formed on the surface of age hardened Ti-6Al-4 V alloy in Ringer’s physiological solution at 37 °C. The influence of age hardening at 740 °C for different ageing times up to 8 h on the microstructural features and electrochemical properties were characterized. To do so, the microstructural evolution was studied using X-ray diffraction technique, Vickers microhardness test and scanning electron microscopy, while the electrochemical characteristics were investigated by electrochemical impedance spectroscopy, Mott-Schottky analysis and point defect model (PDM). The experimental results indicated less microhardness and microstrain values due to proceeding phase transformation of β to α at prolonged ageing times, which exerted an adverse effect on the passive film properties as a result of the formation of more defective passive films upon the surface. The PDM results revealed that deteriorated corrosion protection ability of the passive films on the surface of overaged specimens can be attributed to higher diffusivity of the point defects in their respective crystal structure.

Khashayar Morshed-Behbahani

Papers

An electrochemical study on the effect of stabilization and sensitization heat treatments on the intergranular corrosion behaviour of AISI 321H austenitic stainless steel

The effect of surface modification on the corrosion protection ability of the passive films of sensitized UNS S31803 duplex stainless steel

A survey on the passivity of tempered AISI 420 martensitic stainless steel

Perspective on the passivity of Ti6Al4V alloy in H2SO4 and NaOH solutions

In Vitro Electrochemical Behavior of Aged Ti-6Al-4V Alloy: A Trial of the Point Defect Model