The Continuous Plating of Ni-Cr Composite Coatings and TiO2 Nano-Modify

2011 ◽  
Vol 239-242 ◽  
pp. 227-231
Author(s):  
Deng Xue Du ◽  
Zhi Peng Zhang ◽  
Lei Zhou
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Nickel Sulfate ◽  
Volume Ratio ◽  
Strengthening Effect ◽  
Dispersion Strengthening ◽  
Alloy Films ◽  
Average Size ◽  
Cr Film

Ni-Cr films were electrodeposited from a nickel sulfate, chromium chloride and chromium sulfate bath. To avoid the poor adhesion and bad surface morphology of the secondary-co-deposition of Ni-Cr alloy films, H2O and DMF (volume ratio as 1:1) is used as solvent. Along with the alloy films growing thick, their surface apertures become larger correspondingly, which causes the hardness and corrosion resistance of the films becoming poor. For comparison, nanocrystalline Ni-Cr films with TiO2nanoparticles were obtained on the same condition. TiO2nanoparticles have an average size of 40 nm. The corrosion resistance of the Ni-Cr composite coatings were comparatively evaluated by salt spray test. It is found that the incorporation of TiO2particles enhances the microhardness and corrosion resistance of the coatings. The reason is that the nano-TiO2particles in the deposit effectively reduce the size of Ni and Cr crystals through grain refinement-strengthening and dispersion-strengthening effect. The observation results of scanning electron microscopy (SEM) indicated that the Ni-Cr films without dispersions of TiO2nanoparticles exhibited numerous large and deep crackles, however, the crackles of nano-TiO2Ni-Cr film distinctly became less.

A STUDY OF COMPOSITE COATINGS ON 22MnCrNiMo STEEL FOR MOORING CHAIN

2018 ◽  
Vol 25 (03) ◽  
pp. 1850074
Author(s):  
YAN SHEN ◽  
PRASANTA K. SAHOO ◽  
YIPENG PAN
Keyword(s):  
Corrosion Resistance ◽  
Experimental Work ◽  
Structural Characteristics ◽  
Composite Coatings ◽  
Salt Spray ◽  
Corrosion Performance ◽  
Sic Particles ◽  
Pulsed Electrodeposition ◽  
Mooring Chain ◽  
Spray Treatment

In order to enhance the corrosion resistance of mooring chain, the composite coatings are carried out on the surface of 22MnCrNiMo steel for mooring chain by double-pulsed electrodeposition technology using centrifugal force in the rotating device. The microstructure and anti-corrosion performance of the composite coatings have been investigated experimentally. This paper mainly focuses on the experimental work to determine the structural characteristics and corrosion resistance of composite coatings in the presence of nano-SiC. The results show that the presence of nano-SiC has a significant effect on the preparation of composite coating during the process. The surface of the coating becomes compact and smooth at a moderate concentration of nano-SiC particles. Furthermore, the best corrosion resistance of the composite coatings can be obtained when the concentration of nano-SiC particles is 2.0[Formula: see text]g.L[Formula: see text] after salt spray treatment.

Effect of N2H4 on Electrodeposition of Ni-Graphene Composite Coatings and their Corrosion Resistance Property

2015 ◽  
Vol 816 ◽  
pp. 192-199 ◽  
Author(s):  
Quan Yao Yu ◽  
Ying Xin Zhang ◽  
Zhen Zhen Liu ◽  
Zhi Xiang Zeng ◽  
Xue Dong Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
Nickel Sulfate ◽  
Anticorrosion Property ◽  
Deposition Method ◽  
Graphene Composite ◽  
Nickel Coatings ◽  
Corrosion Resistance Property ◽  
Electrochemical Deposition Method ◽  
Polarization Test

The Ni-graphene composite coatings were prepared by electrochemical deposition method, using nickel sulfate and graphene as primary reagents. Pure Ni coatings, Ni-graphene coatings with N2H4 and Ni-graphene coatings without N2H4 were prepared from three different but similar electrolytes. The N2H4 added into the solution is for complexation with NiSO4 to settle the Ni ions. Graphene used in this work is characterized by TEM and HRTEM. The reaction of N2H4 with NiSO4 is characterized by XRD and optical graphs. The composite coatings’ morphology, structure and corrosion resistance were characterized by SEM and Potentiodynamic polarization test, respectively. The results show that well dispersed graphene–nickel coatings can be prepared with N2H4 in the electrolyte. By comparison with the situation that electrolyte without N2H4, graphene agglomerated at the surface of nickel coatings. The grain of the coatings prepared with and without N2H4 shows similar sizes. Ni-graphene coatings exhibit poor anticorrosion property by comparison with pure Ni coatings because of the defects (cracks and roughness on composite coatings with and without N2H4 in the solution, respectively) on the surface of graphene nickel coatings. These results provide a basis viewpoint for the further research of graphene-metallic composite coatings’ anticorrosion effect.

scholarly journals Composite Coatings of Chromium and Nanodiamond Particles on Steel

2017 ◽  
Vol 62 (4) ◽  
pp. 2421-2424 ◽  
Author(s):  
N. Gidikova ◽  
M. Sulowski ◽  
V. Petkov ◽  
R. Valov ◽  
G. Cempura
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Machine Building ◽  
Chromium Coating ◽  
Detonation Synthesis ◽  
Micro Structure ◽  
X Ray ◽  
Average Size

AbstractChrome plating is used to improve the properties of metal surfaces like hardness, corrosion resistance and wear resistance in machine building. To further improve these properties, an electrodeposited chromium coating on steel, modified with nanodiamond particles is proposed. The nanodiamond particles (average size 4 nm measured by TEM) are produced by detonation synthesis (NDDS). The composite coating (Cr+NDDS) has an increased thickness, about two times greater microhardness and finer micro-structure compared to that of unmodified chromium coating obtained under the same galvanization conditions. In the microstructure of specimen obtained from chrome electrolyte with concentration of NDDS 25 g/l or more, “minisections” with chromium shell were found. They were identified by metallographic microscope and X-ray analyser on etched section of chromium plated sample. The object of further research is the dependence of the presence of NDDS in the composite coating from the nanodiamond particles concentration in the chroming electrolyte.

Effect of Black Plate on Growth Action and Corrosion Resistance of Sn-Fe Alloy Film

2011 ◽  
Vol 121-126 ◽  
pp. 100-104
Author(s):  
Jian Zhong Li ◽  
Yan Wen Tian ◽  
Ying Li ◽  
Yu Cheng Wang
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Corrosion Damage ◽  
Alloy Film ◽  
Void Space ◽  
Alloy Films ◽  
Fe Alloys ◽  
Black Plate ◽  
Annealing Mode ◽  
Better Than

Effect of black plate on growth action and corrosion resistance of Sn-Fe alloy film was investigated by means of metallurgical microscope, scanning electron microscopy (SEM), salt spray corrosion test and electrochemistry methods. The results show that the different modes of annealing and rolling have a remarkably effects on the surface morphology and grain size of Sn-Fe alloys. Crystalline grain of Sn-Fe alloy film for T4-CA or T2.5-BA is relatively continues, homogeneous and denser, but that for DR materials exists obviously surface inhomogeneity sizes and even void space of interweave. Rust spot easily generate on discontinuous alloy films or void space of interweave growth and gradually cover on the surface of Sn-Fe alloy films without corrosion damage. Corrosion resistance of BA materials is better than that of CA materials. Under the same annealing mode, corrosion resistance of DR materials is worse.

scholarly journals Accelerated climatic testing of composite coatings on AMg3 aluminum alloy in salt spray medium

2020 ◽  
pp. 78-83
Author(s):  
В.С. ФИЛОНИНА ◽  
К.В. НАДАРАИА ◽  
А.С. ГНЕДЕНКОВ ◽  
И.М. ИМШИНЕЦКИЙ ◽  
Д.В. МАШТАЛЯР ◽  
...  
Keyword(s):  
Composite Material ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coatings ◽  
Salt Spray ◽  
Composite Polymer ◽  
Climatic Testing ◽  
Salt Fog ◽  
Positive Effect

Представлены результаты ускоренных климатических испытаний композиционных полимерсодержащих покрытий на сплаве алюминия АМг3. Выявлено положительное влияние импрегнированного в поры ПЭО-покрытия композиционного материала на смачиваемость и коррозионную стойкость исследуемых образцов в условиях долговременного воздействия соляного тумана. Наиболее высокую коррозионную стойкость продемонстрировали образцы с четырехкратным нанесением ультрадисперсного политетрафторэтилена. The results of accelerated climatic tests of composite polymer-containing coatings on the AMg3 aluminum alloy are presented in the paper. According to the results of the studies carried out, a positive effect of the penetrated composite material into the pores of a PEO-coating on the wettability and corrosion resistance of the test samples under conditions of long-term exposure to salt fog has been revealed. The highest corrosion resistance was demonstrated by samples with a fourfold (СС-4x) application of superdispersed polytetrafluoroethylene.

scholarly journals Electrodeposition and Corrosion Resistance Properties of Zn-Ni/TiO2Nano composite Coatings

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
B. M. Praveen ◽  
T. V. Venkatesha
Keyword(s):  
Corrosion Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Salt Spray ◽  
Sol Gel ◽  
Steel Plates ◽  
Nano Particles ◽  
Average Crystalline Size ◽  
Fine Grain ◽  
Diffraction Patterns

Nano sized TiO2particles were prepared by sol-gel method. TiO2nano particles were dispersed in zinc-nickel sulphate electrolyte and thin film of Zn-Ni-TiO2composite was generated by electrodeposition on mild steel plates. The effect of TiO2on the corrosion behavior and hardness of the composite coatings was investigated. The film was tested for its corrosion resistance property using electrochemical, weight loss, and salt spray methods. The paper revealed higher resistance of composite coating to corrosion. Microhardness of the composite coating was determined. Scanning electron microscope images and X-ray diffraction patterns of coating revealed its fine-grain nature. Average crystalline size of the composite coating was calculated. The anticorrosion mechanism of the composite coating was also discussed.

The Effect of Different CeO2 Addition on Performance of Ni-WC Composite Coating by Vacuum Fusion Sintering

2013 ◽  
Vol 750-752 ◽  
pp. 2052-2056 ◽  
Author(s):  
Lu Miao ◽  
Ya Nan Wang ◽  
Yan Hui Li
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Testing Machine ◽  
Wear Testing ◽  
Hardness Tester ◽  
Resistance Property ◽  
Corrosion Resistance Property ◽  
Better Than

By vacuum fusion sintering technique made different CeO2 addition Ni-WC composite coatings on 45 steel. Hardness, wear resistance property and corrosion resistance property of the Rare-earth Ni-WC composite coatings were measured and analyzed by Rockwell hardness tester,micro-hardness tester, friction wear testing machine and Salt spray corrosion box. The results showed that:The CeO2 content comes up to 0.75% of the coatings` hardness, wear resistance and corrosion resistance property better than those of other coatings.

scholarly journals Microstructure and Corrosion Resistance of Aluminium and Copper Composite Coatings Deposited by LPCS Method

2016 ◽  
Vol 61 (4) ◽  
pp. 1945-1952 ◽  
Author(s):  
M. Winnicki ◽  
M. Rutkowska-Gorczyca ◽  
A. Małachowska ◽  
T. Piwowarczyk ◽  
A. Ambroziak
Keyword(s):  
Corrosion Resistance ◽  
Working Conditions ◽  
Atmospheric Corrosion ◽  
Composite Coatings ◽  
Salt Spray ◽  
Cold Spraying ◽  
Chloride Ions ◽  
Copper Coatings ◽  
Copper Composite ◽  
Spraying Method

Abstract The paper presents the study of microstructure and corrosion resistance of composite coatings (Al+Al2O3 and Cu+Al2O3) deposited by Low Pressure Cold Spraying method (LPCS). The atmospheric corrosion resistance was examined by subjecting the samples to cyclic salt spray and Kesternich test chambers, with NaCl and SO2 atmospheres, respectively. The selected tests allowed reflecting the actual working conditions of the coatings. The analysis showed very satisfactory results for copper coatings. After eighteen cycles, with a total time of 432 hours, the samples show little signs of corrosion. Due to their greater susceptibility to chloride ions, aluminium coatings have significant corrosion losses.

Corrosion Resistance of Nickel-Based Composite Coatings Reinforced by Spherical Tungsten Carbide

2020 ◽  
Vol 993 ◽  
pp. 1075-1085
Author(s):  
Li Fan ◽  
Hai Yan Chen ◽  
Hai Liang Du ◽  
Yue Hou ◽  
Qian Cheng
Keyword(s):  
Corrosion Resistance ◽  
Tungsten Carbide ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Electrochemical Corrosion ◽  
Corrosion Properties ◽  
Oil Drilling ◽  
Passivation Film ◽  
Spherical Tungsten Carbide

Nickel-based composite coatings reinforced by spherical tungsten carbide were deposited on 42CrMo alloy steel using plasma transfer arc welding (PTAW) process. Their electrochemical corrosion properties in NaCl solution under atmospheric and high pressure were studied by polarization curve, electrochemical impedance spectroscopy. The corrosion and erosion resistance of the coatings were also investigated by salt spray corrosion and erosion corrosion tests. The results show that the self-corrosion potential of the composite coatings increased with the increase of tungsten carbide content, and the Cr element in Ni60 sample formed a stable and compact passivation film. Compared with corrosion at atmospheric pressure, the adsorption and penetration of Cl- on the coating surface enhanced due to the increase of Cl- activity under pressure, thereby to weaken the corrosion resistance. The Samples that passivated in salt spray environment, cannot completely hinder the corrosion of the coating, just only to slow down the corrosion. This study can provide theoretical basis for deep-sea oil drilling and production engineering equipment.

Study of Corrosion Performance of Electroless Ni-P Coating with Molybdenum Disulfide Nanoparticles

2008 ◽  
Vol 373-374 ◽  
pp. 256-259 ◽  
Author(s):  
Xian Guo Hu ◽  
Wen Ju Cai ◽  
Jiu Cong Wan ◽  
Yu Fu Xu ◽  
Xiao Jun Sun
Keyword(s):  
Corrosion Resistance ◽  
Molybdenum Disulfide ◽  
Composite Coating ◽  
Steel Substrate ◽  
Surface Film ◽  
Composite Coatings ◽  
Salt Spray ◽  
Optical Microscope ◽  
Corrosion Mechanism ◽  
Corrosion Properties

The electroless nickel-phosphor coatings containing molybdenum disulfide nanoparticles were prepared and analyzed in this paper. The effects of incorporation of MoS2 into the Ni-P coating on the morphology of the coating surface and corrosion properties were also studied. Corrosion tests were conducted inside a salt spray box with NaCl solution (5.0 wt%). The corrosional surfaces were studied and analyzed through optical microscope, X-ray spectrometer (XRD) and scanning electron microscopy (SEM). The investigation on the relationship between heat-treatment and the corrosion resistance of the coatings showed that the corrosion resistance of the composite coating became worse because of the occurrence of transformation from non-crystalline to crystalline, and then increased the metastable intergradation of the composite coating. Meanwhile, the experimental results also showed that corrosion resistance of the coating containing MoS2 was higher than that of steel substrate. The corrosion mechanism of the composite coatings was mainly ascribed to the formation of micro-cell around the nanosized MoS2 particles, and the active ion like Cl- destroyed the surface film and induced the corrosion towards the inside part of coating.

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