2018
DOI: 10.1002/maco.201810293
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Corrosion and corrosion fatigue performances of micro‐arc oxidation coating on AZ31B cast magnesium alloy

Abstract: In this work, the corrosion performances of micro‐arc oxidation (MAO) coating on AZ31B cast alloy were examined. MAO coating synthesized at a low current density of 34 mA/cm2 has a uniform and compact microstructure with very fine micro‐pores and few structural defects; thus, robust protection is provided for the AZ31B substrate in corrosive solutions. The long‐term corrosion and corrosion fatigue behaviors of the MAO coatings formed at the optimal current density for 5 and 10 min were characterized. The resul… Show more

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Cited by 31 publications
(13 citation statements)
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“…On the contrary, 8AF and 8AF+SG samples have the highest Rp value of 31432.5 Ω cm 2 and 31546.8 Ω cm 2 , respectively. Although, the Rp of 8AF+SG and 8AF are very similar, the 8AF+SG exhibited a better corrosion resistance 34 because this system includes an additional diffusive resistance (68716 Ω cm 2 ) (non‐faradaic resistance) between the sol‐gel coating and PEO oxide layer, blocking the penetration of the electrolyte to the inner substrate. These results are in good agreement with the polarization curves analysis.…”
Section: Resultsmentioning
confidence: 98%
“…On the contrary, 8AF and 8AF+SG samples have the highest Rp value of 31432.5 Ω cm 2 and 31546.8 Ω cm 2 , respectively. Although, the Rp of 8AF+SG and 8AF are very similar, the 8AF+SG exhibited a better corrosion resistance 34 because this system includes an additional diffusive resistance (68716 Ω cm 2 ) (non‐faradaic resistance) between the sol‐gel coating and PEO oxide layer, blocking the penetration of the electrolyte to the inner substrate. These results are in good agreement with the polarization curves analysis.…”
Section: Resultsmentioning
confidence: 98%
“…[8][9][10][11][12] Laser cladding is a kind of surface treatment that has attracted many researchers among a number of possible coating technologies in recent years as laser cladding can provide a thick coating on Mg alloy substrate. [13][14][15][16] Zhu et al [17] have conducted laser cladding of Al powder on the AZ91 Mg alloy substrate. It was found that the cladding layer was mainly composed of Mg 17 Al 12 intermetallic compound and Al solid solution, which showed better corrosion resistance and higher hardness than an uncoated one.…”
Section: Introductionmentioning
confidence: 99%
“…Magnesium alloys are potentially applied in automobile, aerospace, electronic communication, and recreational industries due to low density, high strength, and excellent machinability. [1][2][3] However, they are susceptible to corrosion when exposed in seawater, humid atmosphere with organic/inorganic acids and other salts for their high chemical reactivity. [4][5][6] Therefore, many surface treatments such as microarc oxidation, chemical conversion, and electroless plating are employed to magnesium alloy to improve its corrosion resistance.…”
Section: Introductionmentioning
confidence: 99%