Improving electrochemical corrosion properties of AZ31 magnesium alloy via phosphate conversion with laser shock peening pretreatment

Liu, Huaile; Tong, Zhaopeng; Zhou, Wangfan; Yu, Yihua; Jiao, Jiafei; Ren, Xudong

doi:10.1016/j.jallcom.2020.155837

Cited by 28 publications

(20 citation statements)

References 42 publications

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“…It is reported that all the cracks in rotating–bending fatigue initiate from the surface after ultrasonic nanocrystal surface modification [ 12 ]. By means of the laminated film method, the microcracks which are caused by ultrasonic surface impact processes are the reason for this phenomenon.…”

Section: Resultsmentioning

confidence: 99%

“…By means of mechanical methods, some of the SSN techniques have been hotly researched, such as surface mechanical attrition treatment [ 9 ], ultrasonic surface rolling processing [ 10 ], ultrasonic shot peening [ 11 ], laser shock peening [ 12 ], ultrasonic nanocrystalline surface modification [ 13 ], etc. The mechanical properties are generally improved by these treatments, including the hardness, tensile strength, residual stress, and so on [ 9 , 10 , 11 , 12 , 13 ]. The mechanism of grain refinement involves dislocation, twinning, and the new grain boundaries under high angle misorientation.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Cao

Zhu

Gao³

et al. 2020

Materials

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By means of the ultrasonic surface impact (amplitude of 30 μm, strike number of 48,000 times/mm2), nanograins have been achieved in the surfaces of both Ti6Al4V(TC4) and Ti3Zr2Sn3Mo25Nb(TLM) titanium alloys, mainly because of the dislocation motion. Many mechanical properties are improved, such as hardness, residual stress, and roughness. The rotating–bending fatigue limits of TC4 and TLM subjected to ultrasonic impact are improved by 13.1% and 23.7%, separately. Because of the bending fatigue behavior, which is sensitive to the surface condition, cracks usually initiate from the surface defects under high stress amplitude. By means of an ultrasonic impact tip with the size of 8 mm, most of the inner cracks present at the zone with a depth range of 100~250 μm in the high life region. The inner crack core to TC4 usually appears as a deformed long and narrow α-phase, while the cracks in TLM specimens prefer to initiate at the triple grain boundary junctions. This zone crosses the grain refined layer and the deformed coarse grain layer. With the gradient change of elastic parameters, the model shows an increase of normal stress at this zone. Combined with the loss of plasticity and toughness, it is easy to understand these fatigue behaviors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Cao

Zhu

Gao³

et al. 2020

Materials

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“…Recently, Liu et al 233 showed that LSP pre-treated AZ31B Mg alloy enabled more formation and adhesion of phosphate conversion coating, which eventually increased the corrosion resistance of the alloy. Similar results were reported for ZK60 Mg alloys with a 50% increase in corrosion resistance when modified by LSP compared to the untreated sample 234 .…”

Section: Mechanical Surface Treatmentsmentioning

confidence: 99%

Surface engineering of biodegradable implants: emerging trends in bioactive ceramic coatings and mechanical treatments

2021

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“…7 However, the corrosion rate of magnesium alloys in body fluids containing chloride ions is so fast that their mechanical properties are impaired before the bone tissue heals; at the same time, the formation of hydrogen gas during the corrosion process is prone to subcutaneous emphysema and alkaline pH shift around the implant, which is not conducive to healing of the surrounding tissues, and largely limits its widespread use in clinical practice. 8–12…”

Section: Introductionmentioning

confidence: 99%

Improving corrosion resistance and biocompatibility of AZ31 magnesium alloy by ultrasonic cold forging and micro-arc oxidation

Zhu

Wang

et al. 2022

J Biomater Appl

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Corrosion resistant and biocompatible AZ31 magnesium alloy surfaces were successfully prepared by ultrasonic cold forging and subsequent micro-arc oxidation. The properties of these ultrasonic cold forging pretreated (UCFT)AZ31 magnesium alloy surfaces containing Sr–Ca–P micro-arc oxide coating (MAO/UCFT/AZ31) were studied. Results showed that surface grain refinement of AZ31 Mg alloy in the depth of 400 μm owing to the ultrasonic cold forging pretreatment was verified, and which provides more discharge channels for subsequent micro-arc oxidation. Comparing with the AZ31 magnesium alloy (AZ31) and ultrasonic cold forging technology treated AZ31 magnesium alloy samples (UCFT/AZ31), the corrosion resistance of MAO/UCFT/AZ31 significantly improved, which is also supported by the immersion experiments and electrochemical tests in simulated body fluid. Meanwhile, the MAO/UCFT/AZ31 samples also had excellent cytocompatibility as well as MAO/AZ31 samples. These results may beneficial to the developing of biodegradable medical materials in future.

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Improving electrochemical corrosion properties of AZ31 magnesium alloy via phosphate conversion with laser shock peening pretreatment

Cited by 28 publications

References 42 publications

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

Surface engineering of biodegradable implants: emerging trends in bioactive ceramic coatings and mechanical treatments

Improving corrosion resistance and biocompatibility of AZ31 magnesium alloy by ultrasonic cold forging and micro-arc oxidation

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