Corrosion performance of AZ31 magnesium alloy treated by ultrasonic impact peening (UIP)

Kajánek, Daniel; Hadzima, Branislav; Pastorek, Filip; Jacková, Martina

doi:10.1016/j.matpr.2018.08.136

Cited by 8 publications

(7 citation statements)

References 24 publications

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“…As it was mentioned before, the roughness of the layers has increased with increasing applied current density and the occurrence of heterogeneities and larger pores associated with intensive discharges has been observed. Heterogenities and porosity has increased surface roughness and therefore larger electrochemically active area has been in contact with electrolyte [3,4,12]. That is why the PEO layers formed at higher current densities (0.1 A/cm 2 and 0.15 A/cm 2 ) have been attacked more intensively by aggressive chloride ions compared to a more uniform layer obtained at a current density of 0.05 A/cm 2 .…”

Section: Discussionmentioning

confidence: 99%

Effect of Applied Current Density of Plasma Electrolytic Oxidation Process on Corrosion Resistance of AZ31 Magnesium Alloy

Kajánek¹,

Hadzima²,

Březina³

et al. 2019

Komunikácie

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Impact of applied current density during the plasma electrolytic oxidation (PEO) process on corrosion resistance of AZ31 magnesium alloy was studied. The PEO coatings were prepared using four different current densities with values of 0.025 A/cm2, 0.05 A/cm2, 0.1 A/cm2 and 0.15 A/cm2 in electrolyte consisting of 10 g/l Na 3PO4.12H2O and 1 g/l KOH. Morphology and chemical composition of the coatings was examined using the scanning electron microscopy and EDS analysis respectively. Electrochemical characteristics of ground and coated samples were measured by means of electrochemical impedance spectroscopy (EIS) in 0.1M NaCl solution. Obtained data in form of Nyquist diagrams were analysed by equivalent circuit method. Results of experiments showed that value of applied current density had significant effect on protective performance of the PEO coatings prepared on AZ31 magnesium alloy surface.

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Section: Discussionmentioning

confidence: 99%

Effect of Applied Current Density of Plasma Electrolytic Oxidation Process on Corrosion Resistance of AZ31 Magnesium Alloy

Kajánek¹,

Hadzima²,

Březina³

et al. 2019

Komunikácie

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“…Lower SR by UNSM can be achieved with lower feed rates and shorter stepover distances. The decrease in roughness for the LZ91 sample is due to the lower load of 1.4 N [45], which is less disruptive than the 5, 20, and 85 N loads reported in other studies [42][43][44].…”

Section: Surface Integrity Of Unsmmentioning

confidence: 49%

“…UNSM-treated AZ91 showed a very high hardness increase from 215 HV (bulk) to 295 HV [72]. With variations on the static loading of 5 N [42], 20 N [44], and 85 N [43], the plastic deformation is steadily raised. This results in the formation of twins in AZ31B, as shown in Figure 17c (as indicated by the red arrows in the figure).…”

Section: Surface Integrity Of Unsmmentioning

confidence: 97%

Mechanical Surface Treatments for Controlling Surface Integrity and Corrosion Resistance of Mg Alloy Implants: A Review

Santos

Uddin

Hall

2023

JFB

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The present paper aims to provide an overview of the current state-of-the-art mechanical surface modification technologies and their response in terms of surface roughness, surface texture, and microstructural change due to cold work-hardening, affecting the surface integrity and corrosion resistance of different Mg alloys. The process mechanics of five main treatment strategies, namely, shot peening, surface mechanical attrition treatment, laser shock peening, ball burnishing, and ultrasonic nanocrystal surface modification, were discussed. The influence of the process parameters on plastic deformation and degradation characteristics was thoroughly reviewed and compared from the perspectives of surface roughness, grain modification, hardness, residual stress, and corrosion resistance over short- and long-term periods. Potential and advances in new and emerging hybrid and in-situ surface treatment strategies were comprehensively eluded and summarised. This review takes a holistic approach to identifying the fundamentals, pros, and cons of each process, thereby contributing to bridging the current gap and challenge in surface modification technology for Mg alloys. To conclude, a brief summary and future outlook resulting from the discussion were presented. The findings would offer a useful insight and guide for researchers to focus on developing new surface treatment routes to resolve surface integrity and early degradation problems for successful application of biodegradable Mg alloy implants.

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“…The tested material was continually casted AZ31 magnesium alloy homogenized at 420 °C for 16 hours used also in previous studies [16][17][18][19][20]. Its chemical composition is listed in Table 1.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

Pastorek¹,

Štrbák²,

Kajánek³

et al. 2021

Komunikácie

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A surface treatment process, composed of plasma electrolytic oxidation (PEO) and sealing by temporary oil preservation system containing corrosion inhibitors, was performed on AZ31 magnesium alloy in order to improve its corrosion resistance in environments containing chlorides. Both atmospheric and immersion conditions were evaluated by electrochemical tests in 0.1M NaCl solution together with salt spray test according to STN EN ISO 9227 standard. The obtained results confirmed significant improvement of corrosion resistance reached by the PEO sealing in aggressive environments compared to the pure PEO coating on AZ31 surface. Hence, such a duplex coating is a very perspective alternative for magnesium alloy applications in severe conditions or for temporary protection of magnesium products coated by the PEO during marine transport.

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Corrosion performance of AZ31 magnesium alloy treated by ultrasonic impact peening (UIP)

Cited by 8 publications

References 24 publications

Effect of Applied Current Density of Plasma Electrolytic Oxidation Process on Corrosion Resistance of AZ31 Magnesium Alloy

Effect of Applied Current Density of Plasma Electrolytic Oxidation Process on Corrosion Resistance of AZ31 Magnesium Alloy

Mechanical Surface Treatments for Controlling Surface Integrity and Corrosion Resistance of Mg Alloy Implants: A Review

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

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