Effect of fluoride conversion pretreatment time and the microstructure on the corrosion performance of TEOS-GPTMS sol–gel coatings deposited on the WE54 magnesium alloy

Duran, Kerim; Barrios, Carlos Andrés Hernández; Coy, A.E.; Viejo, F.

doi:10.1016/j.jmrt.2021.10.045

Cited by 9 publications

(2 citation statements)

References 49 publications

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“…The formed MgF 2 layer covers the surface of the magnesium alloys with high homogeneity, which in turn, leads to the uniformity of subsequent coatings. Interestingly, preferential dissolution of some second phases such as Mg 17 Al 12 in AZ91 [ 86 , 89 , 90 ], Mg 12 (Nd,Y) in WE54 [ 91 ], and Al x Mn y in AZ31 [ 92 ] after exposure of the magnesium alloys to HF solutions has been observed. This might be attributed to the high reactivity of the alloying element, specifically aluminum, to HF.…”

Section: Surface Cleaning and Pre-treatmentmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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Corrosion protection systems based on hexavalent chromium are traditionally perceived to be a panacea for many engineering metals including magnesium alloys. However, bans and strict application regulations attributed to environmental concerns and the carcinogenic nature of hexavalent chromium have driven a considerable amount of effort into developing safer and more environmentally friendly alternative techniques that provide the desired corrosion protection performance for magnesium and its alloys. Part I of this review series considers the various pre-treatment methods as the earliest step involved in the preparation of Mg surfaces for the purpose of further anti-corrosion treatments. The decisive effect of pre-treatment on the corrosion properties of both bare and coated magnesium is discussed. The second section of this review covers the fundamentals and performance of conventional and state-of-the-art conversion coating formulations including phosphate-based, rare-earth-based, vanadate, fluoride-based, and LDH. In addition, the advantages and challenges of each conversion coating formulation are discussed to accommodate the perspectives on their application and future development. Several auspicious corrosion protection performances have been reported as the outcome of extensive ongoing research dedicated to the development of conversion coatings, which can potentially replace hazardous chromium(VI)-based technologies in industries.

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Section: Surface Cleaning and Pre-treatmentmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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“…The sol-gel film provides protection against corrosion by sealing the cracks of the Ce-V conversion coating and acting as a barrier. Durán et al mainly evaluated the effect of fluorine-based pretreatment time on the protective degradation mechanism of TEOS/GPTMS hybrid sol-gel coating [ 112 ]. The experimental results show that the long-term pretreatment was beneficial to the formation of the hydroxy magnesium fluoride layer with a higher F/O ratio, thereby improving the corrosion resistance of the coating on WE54 Mg alloy.…”

Section: Composite Sol-gel Coatingsmentioning

confidence: 99%

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

2023

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As the lightest structural materials, magnesium (Mg) alloys play a significant role in vehicle weight reduction, aerospace, military equipment, energy saving, and emission reduction. However, the poor corrosion resistance of Mg alloys has become a bottleneck restricting its wide application. Developing a good surface protective coating can effectively improve the corrosion resistance of Mg alloys. The silane-based sol-gel coating technology has been widely used in the corrosion protection of Mg alloys in recent years due to its advantages of simple process, accessible tailoring of film composition and structure, and excellent corrosion resistance. Whereas the synthesis of sol-gel coatings includes the hydrolysis and dehydration process, which may inherently contain micron or nano defects in the coatings, thereby making it detrimental to the anti-corrosion effect. Therefore, in order to enhance their protection against corrosion, the appropriate modification of sol-gel coatings has become a current research hotspot. This review is based on the modification methods of silane-based sol-gels on the surface of Mg alloys, which are divided into four categories: bare sol-gel, nanoparticles, corrosion inhibitors, and sol-gel-based composite coatings. The modification methods and corrosion protection mechanism are discussed respectively, and the application, development, and research strategies of silane-based sol-gel coatings are included.

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Effect of particle size and concentration of Al2O3 on the corrosion behavior of silane-Al2O3/MWCNT double-layer coating: towards protecting the AZ91 magnesium alloy

Tohidifar

2024

J Sol-Gel Sci Technol

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Effect of fluoride conversion pretreatment time and the microstructure on the corrosion performance of TEOS-GPTMS sol–gel coatings deposited on the WE54 magnesium alloy

Cited by 9 publications

References 49 publications

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

Effect of particle size and concentration of Al2O3 on the corrosion behavior of silane-Al2O3/MWCNT double-layer coating: towards protecting the AZ91 magnesium alloy

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