Journal ArticleDOI
A new method to prepare MgO and base for further electroless nickel deposition on magnesium substrate
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In this paper, the safer hydrogen halide was used to prepare the MgO-MgI2/MgBr2 layers onto AZ91 magnesium alloy in alkaline solution.Abstract:
The present research uses the safer hydrogen halide to prepare the MgO-MgI2/MgBr2 layers onto AZ91 magnesium alloy in alkaline solution. The water-soluble metal salts (MgI2/MgBr2) were not responsible for the corrosion protection; whereas Mg(OH)2 formed first and then converted to MgO by heat-treatments and this MgO was responsible for the corrosion protection. The electrochemical results showed that the development of MgO mitigated the corrosion process and improved the corrosion resistance. This new treatment was then used as a pre-treatment for further electroless nickel (EN) deposition and it showed the good corrosion current density and better corrosion potential on the magnesium substrate. This new treatment and EN depositions were characterised by XPS and SEM. The electrochemical polarisation and EIS test of these EN depositions were evaluated in 3.5 wt.% NaCl. In addition, pitting behaviour of these EN depositions were evaluated by linear sweep voltammetry test.read more
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Estimation of Zwitterionic Surfactant Response in Electroless Composite Coating and Properties of Ni–P–CuO (Nano)Coating
R. Muraliraja,R. Muraliraja,J. Sudagar,R. Elansezhian,A. V. Raviprakash,R. Dhinakaran,V.S. Shaisundaram,M. Chandrasekaran +7 more
TL;DR: In this article, Zwitterionic surfactant was introduced into the composite coating for the first time to increase the suspension of nanoparticles effectively during the coating process, which reduced the intermolecular attraction between the solid and liquid interfaces and eliminated the binding of the nanoparticles with the hydrogen gas bubbles.
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Properties and applications of amphoteric surfactant: A concise review
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Nickel–multiwalled carbon nanotube composite coating on aluminum alloy rotor for textile industries
TL;DR: In this paper, the Ni-MWCNT composite coating has uniformity in thickness over the surface of the inner groove of an aluminim alloy rotor with Zn-Ni interlayer.
References
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Journal ArticleDOI
The corrosion protection afforded by rare earth conversion coatings applied to magnesium
TL;DR: In this article, the corrosion protection afforded by cerium, lanthanum and praseodymium conversion coatings formed on pure magnesium and a magnesium alloy, WE43, has been studied using dc polarisation and ac impedance techniques.
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Conversion-coating treatment for magnesium alloys by a permanganate–phosphate solution
Kwo Zong Chong,Teng Shih Shih +1 more
TL;DR: A chrome-free conversion coating treatment, a mainly permanganate-phosphate solution, was developed in this article for magnesium and its alloys, and the morphology of the conversion-coated layer was observed using SEM; the crystal structure and the composition was analyzed and determined by using XRD and XPS.
Journal ArticleDOI
Cerium based chemical conversion coating on AZ63 magnesium alloy
TL;DR: In this article, a CeCl 3 /H 2 O 2 aqueous solution treatment is assessed for the formation of conversion coatings on a AZ63 magnesium alloy, which appears to consist of a thin and cracked coating with large agglomerates over cathodic intermetallic particles.
Journal ArticleDOI
Active Corrosion Protection in Ce-Modified Hydrotalcite Conversion Coatings
TL;DR: The self-healing properties of chromate conversion coatings (CCC) have been investigated in this article, showing that CCC can selfheal if mechanical or chemical damage occurs, provided the damage is not too severe.
Journal ArticleDOI
A non-chromate conversion coating for magnesium alloys and magnesium-based metal matrix composites
M. A. González-Núñez,C.A. Nunez-Lopez,P. Skeldon,George Thompson,H. Karimzadeh,H. Karimzadeh,P. Lyon,P. Lyon,T.E. Wilks,T.E. Wilks +9 more
TL;DR: In this paper, the development of a conversion coating in a stannate bath on magnesium-based ZC71 alloy and on a metal matrix composite (MMC), comprising a ZC 71 alloy matrix and 12 vol% SiC particles, has been studied using weight gain behaviour, measurements of corrosion potential, X-ray diffraction and microscopic examination.