Multilayer sol–gel coatings for corrosion protection of magnesium

Tan, A.L.K.; Soutar, Andrew M.; Annergren, I.; Liu, Y.N.

doi:10.1016/j.surfcoat.2004.10.066

Cited by 188 publications

(85 citation statements)

References 5 publications

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“…However, expensive solutions, and careful analytical control of the bath are needed [3]. The process has been further developed by the application of multi-layer Ni-P with higher P content on the surface or the use of multi layer sol-gel and DC electroplating in order to improve the corrosion resistance in severe environments [ 20,50,51].…”

Section: Electroless Platingmentioning

confidence: 99%

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Mahallawy

2008

KEM

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Magnesium alloys are attractive alloys in industrial applications , where light weight and good strength structures are required. Magnesium alloys are versatile and include both cast and wrought alloys. However, they have a drawback as they are prone to corrosion especially in harsh environments. For this reason, surface treatment of magnesium alloys is of prime importance for improving their corrosion characteristics.In the present paper, a survey of the different methods for surface treatment of magnesium alloys is presented and discussed. This is followed by a review of the recent work on electroless Ni plating technique with zinc pre-treatment applied on several magnesium alloys and the effect of pretreatment and post heat treatment on the coat characteristics. The surface morphology, surface roughness, thickness of the layer, EDX analysis, adhesion, hardness and corrosion resistance are covered in this review.

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Section: Electroless Platingmentioning

confidence: 99%

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Mahallawy

2008

KEM

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“…Dip coating and pneumatic spray are two techniques that can be used to deposit bioactive coatings on metal substrates. With the dip coating technique, very uniform and thin coatings (<4µm) can be obtained [14][15][16]. Regarding to the spray technique it has been found good results with bioactive coatings applied by airbrush, with thickness in the 50-500 µm range and with adhesion strength of 25 MPa [17].…”

Section: Introductionmentioning

confidence: 98%

Bioactive Sol Gel Coatings Applied Using the Pneumatic Spray Technique on AISI 316L Stainless Steel

A¹

2015

J Biotechnol Biomater

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Bioactive coatings were obtained via the sol gel method and deposited on stainless steel AISI 316L using a pneumatic spray. TEOS and MTES were used as precursors, obtaining a hybrid sol; wollastonite bioactive particles were dispersed inside the sol. The corrosion resistance of the coatings was tested with potentiodynamic curves after immersion of the coatings in SBF for 7 and 40 days. It was possible to obtain coatings with a thickness of 47.7 ± 8 µm. In comparison with other methods of deposition, it was possible to obtain thicker coatings with the pneumatic spray deposition technique, giving the substrate a better protection factor against corrosion. After immersion in SBF (simulated physiologic fluid), the formation of an appetite film on the surface and inside the pores was observed. Deposition of the apatite film helps to promote Osseo integration, and the product formation inside the pores helps to improve corrosion resistance of the substrate.

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“…Stresses can be generated due to shrinkage and thermal expansion mismatch [10]. Multiple layers have increased thickness as well as enhanced corrosion protection [11][12][13][14]. In addition, coatings can also be loaded with inhibitors, in order to enhance their performance [15].…”

Section: Introductionmentioning

confidence: 99%

Silica-Based Sol-Gel Coating on Magnesium Alloy with Green Inhibitors

et al. 2017

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Abstract:In this work, the performances of several natural organic inhibitors were investigated in a sol-gel system (applied on the magnesium alloy Mg AZ31B substrate). The inhibitors were quinaldic acid (QDA), betaine (BET), dopamine hydrochloride (DOP), and diazolidinyl urea (DZU). Thin, uniform, and defect-free sol-gel coatings were prepared with and without organic inhibitors, and applied on the Mg AZ31B substrate. SEM and EDX were performed to analyze the coating surface properties, the adhesion to the substrate, and the thickness. Electrochemical measurements, including electrochemical impedance spectroscopy (EIS) and anodic potentiodynamic polarization scan (PDS), were performed on the coated samples to characterize the coatings' protective properties. Also, hydrogen evolution measurement-an easy method to measure magnesium corrosion-was performed in order to characterize the efficiency of coating protection on the magnesium substrate. Moreover, scanning vibrating electrode technique (SVET) measurements were performed to examine the efficiency of the coatings loaded with inhibitors in preventing and containing corrosion events in defect areas. From the testing results it was observed that the formulated sol-gel coatings provided a good barrier to the substrate, affording some protection even without the presence of inhibitors. Finally, when the inhibitors' performances were compared, the QDA-doped sol-gel was able to contain the corrosion event at the defect.

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Multilayer sol–gel coatings for corrosion protection of magnesium

Cited by 188 publications

References 5 publications

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Bioactive Sol Gel Coatings Applied Using the Pneumatic Spray Technique on AISI 316L Stainless Steel

Silica-Based Sol-Gel Coating on Magnesium Alloy with Green Inhibitors

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