The Anodization of Magnesium at High Voltages

Ross, Philip N.; MacCulloch, J.; Wright, Graham A.; Carter, Ellen A.; Barton, Thomas Frank

doi:10.4271/980088

Cited by 5 publications

(3 citation statements)

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“…In the case of spark anodizing, it may also be influenced by the characteristics of the process in which a high energy disruptive event takes place close to the substrate surface. [99] The Anomag process deliberately avoids the intense, localized heating that is believed to be associated with some other magnesium anodizing processes and may adversely affect mechanical properties of the components. [43] The Anomag process is not a spark anodizing process and the anodic coating exhibits little residual porosity.…”

mentioning

confidence: 99%

Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments

Blawert¹,

Dietzel²,

et al. 2006

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This paper reviews various aspects of anodizing of magnesium alloys, such as the basics, processes, properties and applications. It systematically summarises the existing fundamental studies and technical developments of anodizing of magnesium alloys, and concludes that new anodizing processes based on electrolytic plasma anodizing that convert the surface of a magnesium alloy into a hard ceramic coating in an electrolytic bath using high energy electric discharges can offer improved wear and corrosion resistance. These new anodized coatings are often claimed to perform better than the traditional ones obtained through older anodizing processes, such as DOW17 or HAE. The new anodizing techniques are chromate free and hence environment friendly. It is expected that more cost‐effective, environment‐friendly and non‐toxic anodizing techniques will be developed and applied to magnesium alloy components in the future.

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confidence: 99%

Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments

Blawert¹,

Dietzel²,

et al. 2006

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“…The anodic and cathodic polarization curves of each substrate treatment were measured. Polarization measurement took place after immersion in a non-deaerated 5% NaCl aqueous solution at 30 C for 900 seconds and at a sweep rate of 1 mV/ sec. As the reference electrode, an Ag/AgCl electrode was used.…”

Section: Electrochemical Evaluation Of Films Formed By Various Substrmentioning

confidence: 99%

“…We believe the composite film of environmentally friendly SAF [13][14][15] with environmentally friendly electrodeposition coating to be the optimum treatment. Though many studies on the corrosion mechanism of magnesium alloys in the natural environment, and the chemical conversion treatment and anodizing themselves have been reported, [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] relatively little research has been reported on the influence of the anodizing film of the magnesium alloy on electrodeposition coating film, and research on the corrosion resistance of the composite film of anodizing with electrodeposition coating. 32,33) In this study, as the substrate treatment for AZ91D diecasting material, which is a magnesium alloy, with high application and considerable strength, we applied the abovementioned environmentally friendly silicate-based anodizing, the typical anodizing treatment DOW17 anodizing and the JIS3-type MX (H8652) treatment which offered optimum corrosion resistance among the chemical conversion methods, applied cationic electrodeposition coating or organic spray coating on these substrate treatments and also applied a comparison test of corrosion resistance by the CASS (Copper Accelerated Acetic Acid Salt Spray) Test.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Composite Film of Anodizing and Electrodeposition Coating Having a High Corrosion Resistance on Magnesium Alloy AZ91D

et al. 2007

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In this study, we compared and examined the corrosion resistance of the magnesium alloy with the composite film of 2 kinds of coating on 3 kinds of surface treated film as the substrate treatment. 3 kinds of surface treated film stands for conventional DOW17 anodized film (DAF), chemical conversion treatment JISA3-type MX3 film (CCF), which contain hexavalent chromium, fluorine and phosphorus compounds, and environmentally friendly silicate anodized film (SAF) containing no hazardous substances and 2 kinds of coating stands for organic coating and electrodeposion coating. As a result of the analysis, we could observe that it was extremely effective for magnesium alloy AZ91D to apply the composite film of environmentally friendly SAF with cationic electrodeposition coatings to obtain superior corrosion resistance to that of the composite film of conventional DAF or CCF with organic spray coating. At the same time we could take an action for the environment countermeasure by using the environmentally friendly SAF with the water base cationic electrodeposition coatings as a countermeasure for VOC (Volatile Organic Compound) regulations.

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Magnesium (Mg) corrosion protection techniques in the automotive industry

Cole

2013

Corrosion Prevention of Magnesium Alloys

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The Anodization of Magnesium at High Voltages

Cited by 5 publications

References 1 publication

Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments

Anodizing Treatments for Magnesium Alloys and Their Effect on Corrosion Resistance in Various Environments

Environmentally Friendly Composite Film of Anodizing and Electrodeposition Coating Having a High Corrosion Resistance on Magnesium Alloy AZ91D

Magnesium (Mg) corrosion protection techniques in the automotive industry

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