Achieving the lightweight wear-resistant TiC reinforced AlFeCrCo medium-entropy alloy coating on Mg alloy via resistance seam processing

A new hot dip Zn-5%Al-0.3%Mg alloy coating was performed on cold rolled common steel. The hot-dip process was executed by self-made hot dip galvanising simulator (China patent, No.201010160353). The corrosion resistance of alloy-coated steels was detected by neutral salt spray test . SEM and EDS test results demonstrate that Mg is mainly distributed in the crystal boundary. XRD test results shows corrosion product of Zn-5%Al-0.3%Mg alloy coating is mainly Zn5(OH)8Cl2•H2O. The characteristic of Zn5 (OH)8Cl2•H2O is dense and insoluble, so it is protective. In order to study the anticorrosion mechanism, all the tests of the Zn-5%Al-0.3%Mg alloy were carried out with Zn-5%Al coating together.

Download Full-text

Cellular automaton modeling of dynamic recrystallization in Al-Mg alloy coating fabricated using the friction surfacing process

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2020.126784 ◽

2021 ◽

Vol 407 ◽

pp. 126784

Author(s):

Seyedeh Marjan Bararpour ◽

Hamed Jamshidi Aval ◽

Roohollah Jamaati

Keyword(s):

Dynamic Recrystallization ◽

Cellular Automaton ◽

Alloy Coating ◽

Mg Alloy ◽

Friction Surfacing

Download Full-text

IMMERSION AND ELECTROCHEMICAL TESTS STUDY ON CORROSION RESISTANCE OF CHROME-FREE CHEMICAL CONVERSION FILM ON AZ91D Mg ALLOY IN 5 wt% NaCl SOLUTION

Surface Review and Letters ◽

10.1142/s0218625x05007244 ◽

2005 ◽

Vol 12 (03) ◽

pp. 417-424

Author(s):

X. P. ZHANG ◽

G. CHEN

Keyword(s):

Corrosion Resistance ◽

Corrosion Protection ◽

Electrochemical Impedance ◽

Chemical Conversion ◽

Alloy Coating ◽

Charge Transfer Resistance ◽

Mg Alloy ◽

Nacl Solution ◽

Transfer Resistance ◽

Electrochemical Tests

Immersion and electrochemical tests have been applied to study corrosion protection of AZ91D Mg alloy coating with chrome-free chemical conversion (CCC) coat in 5wt% NaCl solution. The immersions tests include weight-loss measurements after full or partial immersion with whole coating and full immersion with damaged coating. The electrochemical tests include electrochemical impedance spectroscopy (EIS) and polarization curves measurement. The results of immersion and electrochemical tests show that chrome-free chemical conversion (CCC) surface treatment can significantly improve the corrosion resistance of AZ91D Mg alloy in 5% NaCl solution, and that the corrosion protection effect of CCC coating is not sensitive to pores or cracks. The equivalent circuit models are fitted from Nyquist plots for the uncoated specimens and the CCC-coated specimens. The charge transfer resistance, R ct , increases from about 1.669 Ω cm2 for the uncoated alloy to about 210 Ω cm2 after the alloy is coated with CCC coating.

Download Full-text