Nickel fluoride as a surface activation agent for electroless nickel coating of anodized AA1050 aluminum alloy

Kocabaş, Mustafa; Örnek, Cem; Curioni, Michele; Cansever, Nurhan

doi:10.1016/j.surfcoat.2019.03.003

Cited by 21 publications

(9 citation statements)

References 37 publications

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“…All the specimen surfaces were ultrasonically cleaned in deionized water for 10 min to remove the surface stains. Before the anodization, the pretreated specimen was sonicated in a 20 g/L NaOH solution for 1 min, sonicated in 30% HNO 3 for 5 s to expose a fresh surface, ultrasonically washed with water and dried to perform anodization . Then the specimens were anodized at 15 V voltage for 40 min at three concentration parameters: 45 g/L H 2 SO 4 + 8 g/L H 3 BO 3 , 90 g/L H 2 SO 4 + 8 g/L H 3 BO 3 , and 135 g/L H 2 SO 4 + 8 g/L H 3 BO 3 .…”

Section: Methodsmentioning

confidence: 99%

Effect of anodizing on galvanic corrosion behavior of T300 CFRP/5083P‐O Al bolted joints

Shan

Guo

Gou

et al. 2019

Materials & Corrosion

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T300 carbon fiber reinforced polymer (CFRP) and 5083P‐O aluminum (5083P‐O Al) alloy bolted joints have been used in high‐speed trains due to the advantages of light weight and high strength. However, high potential difference between the CFRP and 5083P‐O Al will induce galvanic corrosion and result in accelerating corrosion rate of 5083P‐O Al, which is a potential risk for its engineering applications. In this work, combination with the electrochemical analysis, surface and cross‐section corrosive morphologies analysis, the galvanic corrosion behavior between CFRP/5083P‐O Al bolted joints with and without anodizing in 3.5 wt.% NaCl spray was investigated. Results indicated that severe corrosion occurred on unanodized 5083P‐O Al in the coupled regions of the CFRP/5083P‐O Al bolted joint due to galvanic corrosion. With the content of sulfuric acid increasing, the thickness of each Al2O3 layer and atomic oxygen content increases significantly. 5083P‐O Al anodized by the 135 g/L H2SO4 + 8 g/L H3BO3 mixed solution had the favorable Al2O3 film, which increased the resistance of 5083P‐O Al by roughly three orders of magnitude, effectively improving the corrosion resistance of 5083P‐O Al.

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Section: Methodsmentioning

confidence: 99%

Effect of anodizing on galvanic corrosion behavior of T300 CFRP/5083P‐O Al bolted joints

Shan

Guo

Gou

et al. 2019

Materials & Corrosion

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“…Toz h-BN takviyeli akımsız nikel-fosfor (Ni-P) kompozit kaplamalar 1050 Al numunelerin yüzeyine kaplanmıştır. Kaplamaların altlık yüzeyine yapışmasını geliştirmek amacıyla Al numune yüzeylerine kaplama öncesi anodik oksidasyon ve anodize altlık yüzeyini aktifleştirme ön işlemleri uygulanmıştır [5,22]. Toz takviyeli (h-BN) akımsız nikel kompozit kaplamalar, Çizelge 1'de bileşimi verilen çözelti içinde yapılmıştır.…”

Section: Malzeme Ve Yöntem (Materials and Method)unclassified

Heat Treatment Effect of Hexagonal Boron Nitride Reinforced Electroless Nickel Coatings

2019

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ÖZETBu çalışmada, 1050 alüminyum alaşım yüzeyine hekzagonal bor nitrür (h-BN) ilaveli akımsız nikel-fosfor (Ni-P) kompozit kaplama uygulanmış ve 400°C'de 1 saat süreyle yapılan ısıl işlemin kaplama yapısına etkisi incelenmiştir. Kompozit kaplamalar, üç farklı miktarda (1, 5 ve 10 g/L) h-BN içeren çözeltide yapılmıştır. Kaplamalara, Taramalı Elektron Mikroskobu (SEM), X-ışını spektroskopisi (EDS), X-ışını kırınımı (XRD) analizleri yapılmıştır. Bunlara ilaveten yüzey pürüzlülükleri, sertlikleri ölçülmüş ve %3,5 sodyum klorür (NaCl) çözeltisi içinde elektrokimyasal korozyon deneyleri yapılmıştır. Amorf yapıdaki nikel matrisin ısıl işlem ile kristalin yapıya dönüştüğü tespit edilmiştir. Isıl işlem sonucu sertlik değerleri artmış ve en yüksek sertlik değerine (1015 ± 41 HV 0,05 ), 10 g/L h-BN içerikli çözeltide yapılan kaplamada ulaşılmıştır. Elektrokimyasal deneylerde ise ısıl işlemin kompozit kaplamaların korozyon direncini azalttığı belirlenmiştir. ABSTRACTIn this study, surfaces of 1050 aluminium alloy were coated with hexagonal boron nitride (h-BN) reinforced electroless nickel-phosphorus (Ni-P) composite coating and the effect of heat treatment on the coating structure for 1 hour at 400°C was investigated. Composite coatings were performed in solutions which consist of three different compositions (1, 5 and 10 g/L) of h-BN. A scanning electron microscope (SEM), X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis were performed on the composite coatings. Additionally, surface roughness and hardness were measured and finally, electrochemical corrosion experiments were conducted in 3.5% sodium chloride (NaCl) solution. The heat treatment process has identified a transition from the amorphous structure to crystalline in the nickel matrix. The result of heat treatment, hardness values increased and the highest value of hardness (1015 ± 41 HV 0.05 ) was achieved with the specimen coated in 10 g/L h-BN solution. In the electrochemical experiments, a reduction in corrosion resistance of the composite coatings was determined as a result of heat treatment.

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“…In another method using NaCl-SnCl 2 -CeCl 3 salt, the treatment is conducted at the temperature of 473 K for 2 h. These methods give particularly good results in anti-corrosion protection, but are quite time-consuming and energy-consuming. Thermo-chemical treatment carried out in nickel fluoride solutions [ 17 , 18 , 19 ] also gives good results in anti-corrosion protection. It is performed in 5–15 min, at temperatures of 303–323 K. Its advantage is the reduction of energy costs compared to the methods conduced with lanthanide salts; nevertheless, similar to the treatment with steam, a significant reduction in the hardness of the layers is obtained, associated with the appearance of the γ-Al(OH) 3 phase.…”

Section: Introductionmentioning

confidence: 99%

Nanostructure and Morphology of the Surface as Well as Micromechanical and Sclerometric Properties of Al2O3 Layers Subjected to Thermo-Chemical Treatment

et al. 2022

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The article presents the effect of the thermo-chemical treatment of Al2O3 layers on their nanostructure, surface morphology, chemical composition as well as their micromechanical and sclerometric properties. Oxide layers were produced on EN AW-5251 aluminium alloy (AlMg2) by the method of direct current anodizing in a three-component electrolyte. The thermo-chemical treatment was carried out in distilled water and aqueous solutions of Na2SO4·10H2O and Na2Cr2O7·2H2O. It was shown that the thermo-chemical treatment process changes the morphology of the surface of the layers (the formation of a sub-layer from the Na2SO4·10H2O and Na2Cr2O7·2H2O solutions), which directly increases the thickness of the layers by 0.37 and 1.77 µm, respectively. The thermo-chemical treatment in water also resulted in the formation of a 0.63 µm thick sub-layer. The micromechanical tests indicated a rise in the surface microhardness of the layers in the case of their thermo-chemical treatment in water and the Na2SO4·10H2O solution and a decrease in the case of the layers modified in the Na2Cr2O7·2H2O solution. The highest microhardness (7.1 GPa) was exhibited by the layer modified in the Na2SO4·10H2O solution. Scratch tests demonstrated that the thermo-chemically treated layers had better adhesive properties than the reference layer. The best scratch resistance was exhibited by the layer after thermo-chemical treatment in the Na2SO4·10H2O solution (the highest values, practically for all the critical loads) which, together with its low roughness and high load capacity, predispose it to sliding contacts.

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Nickel fluoride as a surface activation agent for electroless nickel coating of anodized AA1050 aluminum alloy

Cited by 21 publications

References 37 publications

Effect of anodizing on galvanic corrosion behavior of T300 CFRP/5083P‐O Al bolted joints

Effect of anodizing on galvanic corrosion behavior of T300 CFRP/5083P‐O Al bolted joints

Heat Treatment Effect of Hexagonal Boron Nitride Reinforced Electroless Nickel Coatings

Nanostructure and Morphology of the Surface as Well as Micromechanical and Sclerometric Properties of Al2O3 Layers Subjected to Thermo-Chemical Treatment

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