Chromate and HF free pretreatment for MAO/electroless nickel coating on AZ31B magnesium alloy

Ezhilselvi, V.; Balaraju, J.N.; Subramanian, S.

doi:10.1016/j.surfcoat.2017.06.049

Cited by 25 publications

(9 citation statements)

References 22 publications

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“… 11 Ezhilselvi et al developed an MAO coating as the interlayer for the electroless Ni–P top coating, and the duplex coating showed about two orders of improved corrosion resistance than the substrate due to the pore-free dense uniform Ni–P coating developed over the MAO interlayer. 12 …”

Section: Introductionmentioning

confidence: 99%

“…11 Ezhilselvi et al developed an MAO coating as the interlayer for the electroless Ni−P top coating, and the duplex coating showed about two orders of improved corrosion resistance than the substrate due to the pore-free dense uniform Ni−P coating developed over the MAO interlayer. 12 Superhydrophobic films have been proven to be an effective method for protecting magnesium alloy from corrosion as an air cushion created by the superhydrophobic structure could inhibit the migration of corrosion ions. 13,14 However, the corrosion resistance of a single superhydrophobic film is unsatisfactory due to its loose structure and limited thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, bilayer coatings, such as chemical conversion coating/electroless coating and microarc oxidation (MAO)/electroless coating, are proposed to improve the corrosion resistance of the traditional single Ni–P coating. − Seifzadeh et al investigated the electroless Ni–P coating on magnesium alloy treated by a cerium–lanthanum–permanganate (CLP) conversion coating, a titanate conversion coating, and a strontium phosphate conversion coating . Singh et al prepared a carbonate and phosphate conversion pretreatment with two steps before the electroless nickel coating .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy

Yuan

Yuan³

et al. 2020

ACS Omega

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A superhydrophobic multilayer coating with excellent corrosion resistance has been fabricated on an AZ61 magnesium alloy through electroless plating and hydrothermal treatment. The surface morphologies, chemical characteristics, wettabilities, and corrosion resistance of the multilayer coating were characterized and discussed. The results show that the electroless Ni–P coating on the magnesium alloy exhibits a nodular structure with micropores and lower corrosion resistance. However, a dense Ni 3 (NO 3 ) 2 (OH) 4 layer, a porous Ni 3 (NO 3 ) 2 (OH) 4 nanostructure layer, and a stearic absorbing layer are grown on the surface of the Ni–P coating with superhydrophobic characters and higher corrosion resistance after hydrothermal treatment. Furthermore, the water contact angle and corrosion resistance of the multilayer coating showed a trend of first increasing and then decreasing as the hydrothermal reaction time increases. The optimum hydrothermal reaction time is 15 h, and the multilayer coating prepared under this condition has the highest corrosion resistance and the highest contact angle. In addition, the protection mechanism of the multilayer coating is discussed, and the formation of the dense Ni 3 (NO 3 ) 2 (OH) 4 layer and the stearic absorbing layer effectively improved the corrosion resistance of the multilayer coating.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy

Yuan

Yuan³

et al. 2020

ACS Omega

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“…Therefore, the range of each factor must be strictly controlled to ensure effective electroless plating. However, numerous factors affect the performance of electroless plating layers [21][22][23]. It is difficult to explain the interactions among these factors by optimizing the corrosion resistance of electroless-plated layers through traditional test design methods, such as orthogonal design test and full factor test [24].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Corrosion Resistance of Electroless Ni–W–P Coatings on Magnesium Alloys by the Response Surface Methodology

Liu

Zhang

et al. 2020

Coatings

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Plating processes greatly affect the corrosion resistance of electroless Ni–W–P coatings on magnesium alloys. In the present research, the corrosion resistance of electroless Ni–W–P alloy-coated AZ91D magnesium alloy was optimized by the response surface methodology. The optimum technological parameters of the plating process were determined by establishing a quadratic regression model, and the influence of these variables and their interactions on the corrosion resistance of the coating was analyzed. The optimum technological parameters of the electroless plating process were nickel sulfate concentration = 20 g/L, sodium tungstate concentration = 15 g/L, sodium hypophosphite concentration = 30 g/L, bath temperature = 60 °C, and bath pH = 9.3. Under these conditions, the coating had the best corrosion resistance. Among the aforementioned five variables, sodium tungstate concentration had the most significant influence on the corrosion resistance of the coating. Different degrees of interactions among the variables greatly affected the corrosion resistance of the coating.

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“…Therefore, many researchers are trying to improve the corrosion resistance of magnesium alloys, such as alloying (Koleini et al , 2012), mechanical pre-processing (Zhang et al , 2012), surface treatment and surface coating technique (Gray and Luan, 2002). Microarc oxidation (MAO) is a novel and effective surface coating technique, which can remarkably enhance the corrosion resistance of magnesium alloy (Xiong et al , 2014; Tang et al , 2017; Ezhilselvi et al , 2017; Sankara Narayanan et al , 2014).…”

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confidence: 99%

Influence of irradiation intensity on corrosion properties of microarc oxidation film on AZ31 magnesium alloy with HIPIB

Han

Chen

et al. 2019

ACMM

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Purpose The purpose of this paper is to investigate the effect of high-intensity pulsed ion beam (HIPIB) intensity on the structure and corrosive properties of microarc oxidation (MAO) films on AZ31 magnesium alloy and explore the mechanism for modified anti-corrosion properties of irradiated films. Design/methodology/approach The energy deposited on the coating surface influences the remelting process of the MAO coatings significantly, which was closely related to the intensity of HIPIB; therefore, HIPIB with various intensities of 100-350 A/cm2, was selected to modify the MAO films on AZ31 magnesium alloy. The changes in film structure and phase structure of modified films were characterized by scanning electron microscopy and X-ray diffractometry (XRD) with CuKα, respectively. The corrosive behavior of the MAO films was featured with polarization curves and electrochemical impedance spectrum in 3.5 per cent NaCl solution on a PAR 2273 electrochemical workstation. Findings The results clearly show that a dense, continual and remelted layer with a few micrometers in thickness was obtained on the irradiated surface at 200 A/cm2, which are mainly responsible for the modified and optimal anti-corrosion property of MAO films by suppressing/retarding the process of the corrosive electrolyte infiltration into magnesium substrate surface. Originality/value The paper reveals that HIPIB irradiation could modify the corrosion resistance by producing a remelted compact layer on the MAO film surface at a suitable irradiation parameter and explored the modified mechanism of MAO films.

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Chromate and HF free pretreatment for MAO/electroless nickel coating on AZ31B magnesium alloy

Cited by 25 publications

References 22 publications

Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy

Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy

Optimization of the Corrosion Resistance of Electroless Ni–W–P Coatings on Magnesium Alloys by the Response Surface Methodology

Influence of irradiation intensity on corrosion properties of microarc oxidation film on AZ31 magnesium alloy with HIPIB

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Chromate and HF free pretreatment for MAO/electroless nickel coating on AZ31B magnesium alloy

Cited by 25 publications

References 22 publications

Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni3(NO3)2(OH)4 Multilayer Protective Coating on Magnesium Alloy

Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni3(NO3)2(OH)4 Multilayer Protective Coating on Magnesium Alloy

Optimization of the Corrosion Resistance of Electroless Ni–W–P Coatings on Magnesium Alloys by the Response Surface Methodology

Influence of irradiation intensity on corrosion properties of microarc oxidation film on AZ31 magnesium alloy with HIPIB

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Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy

Fabrication and Corrosion Resistance of a Superhydrophobic Ni–P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy