Correlation between Microstructural Characteristics and Corrosion Properties of Mg-RE Alloys in Ringer's Solution

Emami, Mohammad1; Bozorg, Mansoor2; Binesh, Behzad1; Jafari Nodooshan, Hamid Reza3

2020-12-01

10.1149/1945-7111/abd519

JOURNAL OF THE ELECTROCHEMICAL SOCIETY   影响因子和分区

0013-4651

1945-7111

The effects of aging heat-treatment and cooling rate from annealing temperature on the microstructure and corrosion properties of a cast Mg-5Gd-2.5Nd-0.5Zn-0.5Zr alloy were studied. The as-cast structure comprised Gd/Nd-rich eutectic phases in alpha-Mg grain boundaries. In water-quenched and aged specimens, fine Zn/Zr-rich precipitates were developed in the matrix. Furnace cooling caused a significant increase in the volume fraction of both fine and coarse precipitates because of the large difference between the solubility of alloying elements at elevated and room temperatures. Immersion tests for up to 240 h in Ringer's solution showed a respective corrosion rate of 0.84, 0.73, 0.41, and 0.39 mm y(-1) for the furnace-cooled, as-cast, water-quenched, and aged samples. The corrosion behavior was further studied by electrochemical impedance spectroscopy and polarization measurements after 1 and 24 h of immersion in the solution. An increase in the volume fraction of Gd/Nd-rich phases led to a decrease in the corrosion resistance. Large second phases acted as cathodic sites for galvanic corrosion and also locally disturbed the protectiveness of the Mg(OH)(2) passive film. Rare earth elements in solid-solution were less detrimental to the corrosion resistance. Less severe corrosion resulted according to SEM observations in the aged and water-quenched samples.

Corrosion Passivity XRD Mg-RE alloys Microstructure heat treatment

SCI ; EI

英语

其他

University of Bonab[2500]

Electrochemistry ; Materials Science

Electrochemistry ; Materials Science, Coatings & Films

WOS:000607839700001

ELECTROCHEMICAL SOC INC

20210309770757

Alloying elements ; Corrosion protection ; Corrosion rate ; Corrosion resistance ; Corrosive effects ; Electrochemical impedance spectroscopy ; Gadolinium alloys ; Grain boundaries ; Heat treating furnaces ; Heat treatment ; Magnesium alloys ; Magnesium compounds ; Neodymium alloys ; Rare earths ; Solution mining ; Volume fraction ; Zinc alloys ; Zinc metallography ; Zircaloy ; Zirconium metallography

Mine and Quarry Operations:502.1 ; Metallurgy:531.1 ; Metallography:531.2 ; Heat Treating Furnaces:532.4 ; Heat Treatment Processes:537.1 ; Metals Corrosion:539.1 ; Corrosion Protection:539.2 ; Magnesium and Alloys:542.2 ; Zinc and Alloys:546.3 ; Rare Earth Metals:547.2 ; Thermodynamics:641.1 ; Chemistry:801 ; Inorganic Compounds:804.2

CHEMISTRY

Web of Science

1.Univ Bonab, Dept Mat Sci & Engn, Bonab 5551761167, Iran
2.Shahrood Univ Technol, Dept Chem & Mat Engn, Shahrood 3619995161, Iran
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Emami, Mohammad,Bozorg, Mansoor,Binesh, Behzad,et al. Correlation between Microstructural Characteristics and Corrosion Properties of Mg-RE Alloys in Ringer's Solution[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2020,167(16).

Emami, Mohammad,Bozorg, Mansoor,Binesh, Behzad,&Jafari Nodooshan, Hamid Reza.(2020).Correlation between Microstructural Characteristics and Corrosion Properties of Mg-RE Alloys in Ringer's Solution.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,167(16).

Emami, Mohammad,et al."Correlation between Microstructural Characteristics and Corrosion Properties of Mg-RE Alloys in Ringer's Solution".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 167.16(2020).