Effect of Protein Concentration on the Corrosion Behavior of Magnesium Alloys

MA Yucong, WANG Pengjie, OUYANG Zhengzheng, Mohd TALHA, LIN Yuanhua

doi:10.16577/j.issn.1001-1560.2025.0085

Materials Protection >

2025 , Vol. 58 >Issue 5: 129 - 145

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0085

Effect of Protein Concentration on the Corrosion Behavior of Magnesium Alloys

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(1.School of New Energy and Materials， Southwest Petroleum University， Chengdu 610500， China；2.National Science Library (Chengdu)， Chinese Academy of Sciences， Chengdu 610299， China)

WANG Pengjie (1993－)， Ph.D.Candidate， Research Focus: Corrosion and Protection of Metal Materials， Tel.:18639067323， E-mail: pjwang15＠163.com

Received date: 2024-09-20

Revised date: 2024-11-22

Accepted date: 2024-11-23

Online published: 2025-06-10

Supported by

Southwest Petroleum University-National Natural Science Foundation of China (52474011)；National Science Library(Chendu) Chinese Academy of Sciences-Youth Project of the Innovation Fund in 2023(E3Z00008)

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Abstract

When magnesium alloy is used in the human physiological environment， it will be affected by protein.In this work， the corrosion mechanism of a magnesium alloy in phosphate-buffered saline (PBS) containing various concentrations of bovine serum albumin (BSA) (0，0.5， 1.0， 1.5， 2.0， 3.5 and 5.0 g/L) was systematically investigated.Surface characterisation was carried out by Fourier-transform infrared spectroscopy (FTIR)， scanning electron microscopy (SEM)，energy-dispersive spectroscopy (EDS) and contact-angle measurements，whereas electrochemical behaviour was evaluated through potentiodynamic polarisation， electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM).Complementary immersion tests were performed to corroborate the electrochemical findings.To elucidate the time-dependent effect of protein concentration， the electrochemical response and corrosion products of specimens immersed for 1， 3 and 7 d in solutions containing 0， 2.0 and 5.0 g/L BSA were also examined.Results showed that the presence of BSA up to 2.0 g/L reduced the corrosion rate， and the minimum corrosion current density occurred at 2.0 g/L，whereas a higher concentration (5.0 g/L) of BSA significantly accelerated localized corrosion of magnesium alloy surface.In the later stages of immersion， the overall corrosion resistance of the alloy deteriorated.When the BSA concentration was kept below 2.0 g/L， protein molecules formed a monolayer via chemisorption on the alloy surface， leading to a continuous decrease in corrosion rate with increasing BSA concentration.During prolonged immersion， this non-dense adsorbed layer was penetrated by the corrosive medium and consequently lost its protective effect.At 5.0 g/L BSA， protein molecules chelated the metal ions released from the alloy， forming soluble complexes that accelerated corrosion.With further immersion， the continual deposition， detachment and chelation of high-concentration BSA further intensified the dissolution of the magnesium alloy.

Key words： magnesium alloy; corrosion; bovine serum albumin; atomic force microscopy (AFM); scanning electron microscopy (SEM)

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MA Yucong, WANG Pengjie, OUYANG Zhengzheng, Mohd TALHA, LIN Yuanhua . Effect of Protein Concentration on the Corrosion Behavior of Magnesium Alloys[J]. Materials Protection, 2025 , 58(5) : 129 -145 . DOI: 10.16577/j.issn.1001-1560.2025.0085

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