Conversion-coating treatment for magnesium alloys by a permanganate–phosphate solution

Chong, Kwo Zong; Shih, Teng Shih

doi:10.1016/s0254-0584(02)00481-9

Cited by 246 publications

(111 citation statements)

References 12 publications

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“…Actually, many researchers have developed more environmental-friendly alternatives, such as permanganate bath, phosphate-permanganate bath, stannate bath, and rare earth metal salts (REMS) bath [3][4][5][6][7][8]. But all the baths include heavy metal icons.…”

Section: Introductionmentioning

confidence: 99%

Conversion coating treatment for AZ31 magnesium alloys by a phytic acid bath

et al. 2009

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A phytic acid chemical conversion bath was applied to a sample of AZ31 magnesium alloy in this study; a transparent conversion coating formed subsequently on the sample surface. The test results of this coating with a scanning electron microscope (SEM) showed that there exist compact coatings on the surface of treated magnesium alloy. With the analyses of electronic probe microscopy (EPMA) and IR spectrum, a further study of this coating indicated that the coating was mainly composed of phytate and oxide or hydroxid. Furthermore, The electrochemical tests showed that the phytic acid bath conversion treatment enhanced the corrosion resistance of AZ31 magnesium alloys. The optimal pH of the phytic acid bath was 9.00-10.00.

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Section: Introductionmentioning

confidence: 99%

Conversion coating treatment for AZ31 magnesium alloys by a phytic acid bath

et al. 2009

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“…Therefore, the tendency in the industry is to eliminate hexavalent chromium from the pretreatment procedures and replacement it with nontoxic and environmentally friendly compounds [8]. An environmentally friendly chemical deposition process is considered to be the one in which hydrofluoric acid is not used (or only a small amount is used) and chromate is replaced by stannates [15,23], phosphates permanganate [22,24], or molybdates [25].…”

Section: Introductionmentioning

confidence: 99%

Effective and Environmentally Friendly Nickel Coating on the Magnesium Alloy

Rončević

Buzuk

Vladislavić

2016

Metals

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Abstract:The low density and good mechanical properties make magnesium and its alloys attractive construction materials in the electronics, automotive, and aerospace industry, together with application in medicine due to their biocompatibility. Magnesium AZ91D alloy is an alloy with a high content of aluminum, whose mechanical properties overshadow the low corrosion resistance caused by the composition of the alloy and the existence of two phases: α magnesium matrix and β magnesium aluminum intermetallic compound. To improve the corrosion resistance, it is necessary to find an effective protection method for the alloy surface. Knowing and predicting electrochemical processes is an essential for the design and optimization of protective coatings on magnesium and its alloys. In this work, the formations of nickel protective coatings on the magnesium AZ91D alloy surface by electrodeposition and chemical deposition, are presented. For this purpose, environmentally friendly electrolytes were used. The corrosion resistance of the protected alloy was determined in chloride medium using appropriate electrochemical techniques. Characterization of the surface was performed with highly sophisticated surface-analytical methods.

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“…Surface treatments can improve the corrosion resistance of magnesium and its alloys, which have been extensive researched in recently years [4]. In the surface treatment methods, Chemical conversion treatment is an effective and simple method, such as chromate [5], permanganate [6], phosphate [7,8], phosphate/permanganate [9,10], etc. Chromate conversion treatment as a conventional chemical conversion method, it has been widely used in industry for long time.…”

Section: Introductionmentioning

confidence: 99%