Corrosion resistant nanostructured eutectic high entropy alloy

Thermally induced structure evolution on the corrosion behavior of Al-Ni-Y amorphous alloys

Al-based amorphous/nanocrystalline coating with a low porosity (0.42%) and a high amorphous content (80.3%) was fabricated by high velocity air-fuel spraying on aluminum alloy 2024. This thin amorphous/nanocrystalline coating with α-Al nanocrystals precipitated in amorphous matrix displays good short-term corrosion resistance, while the corrosion resistance decreases rapidly with increased immersion time. Sealing treatment can effectively close the connecting pores and reduce the porosity defects of coating, thereby improving the corrosion resistance. Among the three selected sealants, stearic acid exhibits the best sealing effect on Al-based amorphous/nanocrystalline coating due to its good impermeability and hydrophobicity, followed by potassium dichromate and nickel acetate. The sealing mechanisms of the three sealants are discussed in terms of reactions at the coating/sealant interface and hydrophobicity of stearic acid.

Influence of sealing treatment on the corrosion behavior of HVAF sprayed Al-based amorphous/nanocrystalline coating

Tuning the microstructure for superb corrosion resistance in eutectic high entropy alloy

Effects of laser power on immersion corrosion and electrochemical corrosion performances of laser thermal sprayed amorphous AlFeSi coatings

The effect of microalloying with Ti or Cr on the corrosion behavior of Al-Ni-Y amorphous alloys in 0.1 M NaCl solution was studied by potentiodynamic polarization, Mott-Schottky, and x-ray photoelectron spectroscopy techniques. Microalloying with Ti or Cr could greatly improve the corrosion resistance of Al-Ni-Y amorphous alloys. A high surface concentration of Ti or Cr in the passive films was detected, which should be responsible for the improved corrosion resistance compared to the control sample. The possible process of Ti or Cr involved in the passive films was proposed in terms of the point defect model and the vacancy diffusion mechanism. Furthermore, the effect of Ti was stronger than Cr because of the higher film resistance as well as the higher surface concentration. The different passivation abilities and atomic radiuses between Ti and Cr were presented to explain the better microalloying effect of Ti compared to Cr.

Effect of Microalloying with Ti or Cr on the Corrosion Behavior of Al-Ni-Y Amorphous Alloys

It has been noticed that interactions between the electron beam irradiation (EBI) and the sample surface during SEM-based mapping processes can produce a contaminated region on the sample surface, but there are not enough experimental results available to directly demonstrate it and its effect on surface properties In this paper, the effect of EBI during electron backscatter diffraction (EBSD) on the surface of 90Cu10Ni alloy was investigated using atomic force microscopy/scanning Kelvin probe force microscopy (AFM/SKPFM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, etc The results revealed that a graphene film was formed on the EBSD mapped area which was different in structure and anti-corrosion performance from the artificial carbon layer Remarkable protectiveness of the graphene film over the substrate against corrosion was demonstrated by immersion tests in both acidic and alkaline NaCl solution The formation mechanism and structural features of the graphene film formed on the EBSD mapped area were discussed, and the effect of two-pass EBSD mapping was investigated shallowly The present study provided a new insight into the EBI effects during EBSD and a promising method to grow graphene directly or pattern graphene in nanoscale on metal substrate

In-situ growth of graphene on 90Cu10Ni by electron beam irradiation during EBSD and its anti-corrosion property

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Thermally induced structure evolution on the corrosion behavior of Al-Ni-Y amorphous alloys

Influence of sealing treatment on the corrosion behavior of HVAF sprayed Al-based amorphous/nanocrystalline coating

Effect of Microalloying with Ti or Cr on the Corrosion Behavior of Al-Ni-Y Amorphous Alloys

In-situ growth of graphene on 90Cu10Ni by electron beam irradiation during EBSD and its anti-corrosion property