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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Substrates on Properties of Anodic Coatings Formed on Mg and Mg Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 248-251 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Substrates have major effects on coating properties. In this paper, pure magnesium,AZ91HP and Mg-Li were separately anodized in a neutral anodizing solution containing hydrofluoricacid, phosphate acid and borate acid. The coating properties such as surface morphology, thicknessand compositions were separately observed and detected. The behavior of voltage with time indicatedthat reaching the same final voltage under the same electric parameters, anodizing time for AZ91HPwas the shortest and Mg-Li the longest. The uniformity of anodic coatings formed on AZ91HP wasthe best and Mg-Li the worst. Analysis by EDX, the phosphorus content of anodic coatings formed onMg-Li was the highest and that on AZ91HP the lowest. Alloying elements of aluminum and lithiumslightly decreased and considerably increased the coating thickness, respectively. The effects oflithium and aluminum on coating properties can be explained by different moving speeds of Mg2+,Al3+ and Li+ as well as Pilling-Bedweorth ratios (PBRs) of MgO/Mg, Al2O3/Al and Li2O/Li
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.248.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Corrosion and Protection of Magnesium Alloy AZ31D by a New Conversion Coating (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 419-422 (Mar. 2003), p. 879-882 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.419-422.879.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Two-Step Anodization of AZ91 Magnesium Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 653-656 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Among four AZ91 samples, two were once anodized and the others were twice anodized in two electrolytic baths. After twice anodization, two coatings coexist on the base metal. Surface morphology showed that for one of twice anodic coatings (sample 2), the second coating only existed on some places and sealed some pores of the first coating after short time on the second anodizing. However, for another twice anodic coating (namely sample 4), the second anodization spent very long time and the coating was thick and loose. Salt spray testing showed that sample 2 had the most excellent corrosion resistance and the reason is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.653.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphate Conversion Coating on Diecast AZ91D and Its Corrosion Resistance (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 819-822 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A phosphate conversion coating was deposited on diecast AZ91D magnesium alloys, the film was a complex phosphate containing Mg and Al,which showed amorphous structure. Corrosion resistance of conversion coating in 3.5%NaCl was investigated by polarization curve. It was showed that the anodic branch of polarization curve for the phosphate conversion coating presented typical passivation characteristic. Immersion test results showed that the corrosion rate of phosphate conversion coating was less than that of chromate Dow7 film
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.819.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Aging on Electrochemical Behavior of T6-Treated WE54 Mg Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 533-536 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructural examinations of T6-treated WE54 magnesium alloy were conducted afterdifferent aging conditions, and the influence of aging on electrochemical behavior of this alloy wasinvestigated. For three batches of samples, with increasing aging time, the amount of precipitatephases was greatly promoted, and they formed in a strengthening continuous way. Electrochemicalstudy showed that the value of corrosion potential followed the tendency to decrease when the agingcondition transformed from under-aged to peak-aged. However, after peak-aging, the corrosionpotential was raised to higher values. Explanations for the observed phenomena were based on therelationship between microstructure, especially precipitate phases, and electrochemical behavior. Atunder-aged condition, matrix served as galvanic cathode and precipitates acted as galvanic anode.Because the amount of precipitate would rise with prolonging aging time, it is natural that corrosionpotential decreased. For over-aged alloys, metastable precipitate phases might in situ change toequilibrium phases, rendering increase of corrosion potential possible
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.533.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of Coating Properties by Two Pulse Modes on Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 585-588 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Micro arc oxidation is an effective method to improve corrosion resistance of magnesiumalloys and the selected electric parameters have great effects on coating properties. In this paper, theeffects of the unipolar pulse and the bipolar pulse on surface morphology, chemical compositions andcorrosion resistance were studied. When working voltage was higher than breakdown voltage, sparksappeared on sample surface whether the unipolar pulse or the bipolar pulse was used. However, underthe same positive working voltage, the spark size and lifetime obtained by the bipolar pulse wereevidently larger and longer than those by the unipolar pulse, which resulted in rougher anodic coatingsand worse corrosion resistance by the former than the latter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.585.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Thin Film on Corrosion Resistance of Pure Mg and Its Anodic Coating (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 865-868 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Al2O3 thin film was formed on pure magnesium and its anodic coating by sol-gel method. SEM observation and EDX analysis showed that Al2O3 film could not totally cover the surface of base metal, but they blocked small pores when they were formed on anodic coating. Potentiodynamic polarization test indicated that Al2O3 films improved corrosion resistance of both anodizing coating and base metal, and the effect on anodizing coating was better than on base metal
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.865.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A Study on the Pretreatment of Direct Electroless Nickel Plating on Magnesium Alloys AZ91D (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 835-838 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Magnesium alloys are considered as “difficult to plate” metal. The pretreatmentprocesses play a key role for plating. The pretreatments of alkaline cleaning, chromic acid etching and hydrofluoric acid activating were carried out and the microstructures investigated by SEM and EDAX in detail. The hydrofluoric acid activating time of 8 minutes was determined by Potential-Time curve. The experimental results showed that the alkaline cleaning moved the grease and oils off the substrate surface, but there was no apparent surface morphology change. Thechromic acid etching was a very critical step, and the optimum etching time of 1 minute was chosen; the eutectic α was severely etched, and the chromic compounds were mainly formed on the surface. During the hydrofluoric acid activating, the white activating product of magnesium fluoride was preferentially generated on the β–phase, and obvious morphology change has been observed on the alloy substrate surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.835.pdf
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