Wear and Corrosion Resistance of Ni-PTFE-SiO2 Composite Coating Deposited by Jet Electrodeposition

2008 ◽  
Vol 373-374 ◽  
pp. 597-600 ◽  
Author(s):  
Wen Song Lin ◽  
Shi Qiang Qian ◽  
Xu Wen Chen
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Anodic Polarization Curve ◽  
Experimental Conditions ◽  
Corrosion Resistant ◽  
Wear And Corrosion ◽  
Jet Electrodeposition ◽  
Pin On Disc ◽  
Jet Velocity ◽  
Wear And Corrosion Resistance

Ni-PTFE/SiO2 composite coatings were prepared by jet electrodeposition. The influences of the particles contents and jet velocity on the properties of the composite coatings were studied. The morphology and microstructure of the coatings were observed on an S-2700 scanning electron microscopy. HX-1 microhardness tester was used to determine the hardness of the coatings. The deposition rate were determined by means of the coatings thickness. The adhesion strength was measured using a scratch tester. Wear resistance tests were performed using a pin-on-disc tribometer with the sample placed horizontally on a turning table. The corrosion behavior of the coatings immersed in 10% H2SO4 solution was analyzed using anodic polarization curve measurement. It was shown that the microhardness of the coatings increased with the increase of SiO2 content, while the addition of PTFE in the coatings resulted in better corrosion-resistant property. Enhancing the jet velocity made the coating compacter. Ni-PTFE-SiO2 composite coatings demonstrated superior wear resistance to Ni-PTFE or Ni-SiO2 coatings under the experimental conditions.

CARPENTER CTS-204P ALLOY (MICRO MELT 20-4)

Alloy Digest ◽  
2010 ◽  
Vol 59 (1) ◽  
Keyword(s):  
Wear Resistance ◽  
Volume Fraction ◽  
Cold Work ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Corrosion Resistant ◽  
Die Steel ◽  
Powder Metallurgy Process ◽  
Wear And Corrosion ◽  
Metallurgy Process

Abstract Carpenter CTS-204P (Micro Melt 20-4) alloy is a highly wear- and corrosion-resistant, air-hardening martensitic cold-work stainless die steel produced using Carpenter’s Micro-Melt powder metallurgy process. The excellent wear resistance of the alloy is provided by a significant volume fraction of hard vanadium-rich carbides, while the outstanding corrosion resistance of the alloy is obtained as a result of the chromium-rich matrix. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion and wear resistance as well as forming, heat treating, and machining. Filing Code: SS-1051. Producer or source: Carpenter Specialty Alloys.

Microstructure and Properties of WC-CO-Cr Coatings

1996 ◽  
Author(s):  
L.-M. Berger ◽  
P. Vuoristo ◽  
T. Mäntylä ◽  
W. Kunert ◽  
W. Lengauer ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Practical Importance ◽  
Wear Test ◽  
Wear Behaviour ◽  
Metallic Binder ◽  
Microstructure And Properties ◽  
Wear And Corrosion ◽  
Number Of Publications ◽  
Wear And Corrosion Resistance

Abstract WC-Co-Cr represents an important composition for hardmetal-like coatings which is appHed when simuhaneous wear and corrosion resistance is required. In this paper five commercially available spray powders obtained by various production techniques (sintered and crushed as well as agglomerated and plasma-densified) of the composition WC-10%Co- 4%Cr have been thoroughly characterized and were sprayed by DCS, HVOF (CDS process) and APS. The microstructures of the coatings were characterized and their wear behaviour was investigated by means of an abrasion wear test. For the best of these powders the wear resistance was nearly equal for the DGS and HVOF coatings. Other powders show significant differences with respect to their processabilities in these spray processes. APS coatings from all powders, obtained with an Ar/H2 plasma showed inferior microstructures and significant lower wear resistance. The spray powder compositions, grain sizes and structures were found to determine the processability of the powders and the microstructure and properties of the coatings. COMPOSITE MATERIALS of the type hard phase - metallic binder with WC and CoCr as constituents are widely used for the preparation of hardmetal-like coatings. The chromium addition to the metallic binder is thought to improve its corrosion resistance in comparison with pure WC-Co. This has led to many applications of WC-CoCr coatings where simultaneous wear and corrosion resistance is required. Despite of its significant practical importance only a limited number of publications is devoted to detailed questions of structure and properties of WC-CoCr coatings (1-3). In some comparative studies such coatings have been investigated together with WC-Co and Cr3C2-NiCr coatings (4-8). However, systematic investigations of spray powder compositions and morphologies as well as investigations of the influence of different thermal spray processes on coating structures and properties which have repeatedly been provided for WC-Co (for example (9, 10)) are missing for WC-CoCr. In this paper a short survey of literature on the phase relationships in the WC-CoCr system and the effect of chromium additions on the properties of sintered parts and thermally sprayed coatings compared to WC-Co is given. In the experimental part a systematic study of the influence of the preparation process on composition and morphology of commercially available WC-10%Co-4%Cr spray powders was provided. These powders have been sprayed by DGS, HVOF and APS and the microstructure and basic properties of the coatings have been studied.

New Fusible Alloys with Enhanced Corrosion Resistance

1997 ◽  
Author(s):  
I. Kretschmer ◽  
P. Heimgartner ◽  
R. Polak ◽  
P.A. Kammer
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Service Performance ◽  
New Family ◽  
Plasma Transferred Arc ◽  
Wear And Corrosion ◽  
Transferred Arc ◽  
Waste Burning ◽  
Wear And Corrosion Resistance ◽  
Characteristic Microstructure

Abstract Fusible Ni-B-Si alloys with a variety of alloy additions (Cr, Mo, Cu etc.) have been in service for many years as fused coatings with moderate corrosion resistance. Both gas- and water-atomised powders have been used with the spray and fuse and with the plasma transferred arc process to produce coatings. As the severity of corrosive industrial environments has increased, for example in waste burning boilers, existing alloys have not provided the desired service performance. This study was undertaken to develop a new family of alloys with improved corrosion resistance without sacrificing usability, wear resistance or cost effectiveness. A range of compositions was prepared and evaluated for deposition characteristic, microstructure, hardness, wear resistance and corrosion resistance in various media. The resulting alloy has an exceptional combination of wear and corrosion resistance in comparison to conventional alloys, when tested under comparable conditions.

Bioactivity, Wear and Corrosion Resistant Properties of Rare Earth/Calcium Phosphate Composite Coatings

2008 ◽  
Vol 368-372 ◽  
pp. 1194-1197 ◽  
Author(s):  
Chen Ma ◽  
Ying Hui Wang ◽  
Mu Qin Li ◽  
Li Jie Qu
Keyword(s):  
Rare Earth ◽  
Calcium Phosphate ◽  
Composite Coatings ◽  
Xrd Analysis ◽  
Wear Properties ◽  
Corrosion Resistant ◽  
Phosphate Coatings ◽  
Wear And Corrosion ◽  
Micro Arc Oxidation ◽  
Calcium Phosphate Coatings

Rare earth/calcium phosphate composite coatings were fabricated on the surface of Ti-6Al-4V by micro-arc oxidation (MAO) technique. The wear properties and corrosion resistant of rare earth/ calcium phosphate composite coatings in the simulated body fluid (SBF) have been investigated and the bioactivity of the composite coatings were evaluated. The results show that the friction coefficient of the composite coatings in the SBF is only 0.15~0.18 and the anode polarization potential of the coating has been obviously enhanced about 0.18V compared with that of coatings of calcium phosphate coatings. So the composite coatings have excellent wear and corrosion resistant properties. XRD analysis indicates that the composite coatings can induce hydroxyapatite to form on its surface after soaked in SBF for 9d, which shows that the composite coatings own good bioactivity.

scholarly journals Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 505
Author(s):  
Xinqiang Lu ◽  
Shouren Wang ◽  
Tianying Xiong ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Cold Spraying ◽  
Neutral Salt ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Long Term Stability ◽  
Spray Technique

Two composite coatings, Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15, were prepared by the cold spray technique and were found to be compact, with no pits or cracks, based on scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) investigations. The results of the neutral salt spray (NSS) and electrochemical tests showed that the two composite coatings possess a suitable corrosion performance. However, the Zn45Al35Mg5ZnO15 composite coatings were more corrosion resistant and allowed a better long-term stability. In addition, they were found to exhibit the best wear resistance and photocatalytic degradation efficiency.

EFFECT OF OXYACETYLENE FLAME REMELTING ON WEAR BEHAVIOUR OF SUPERSONIC AIR-PLASMA SPRAYED NiCrBSi/h-BN COMPOSITE COATINGS

2016 ◽  
Vol 24 (06) ◽  
pp. 1750083 ◽  
Author(s):  
N. N. ZHANG ◽  
D. Y. LIN ◽  
B. HE ◽  
G. W. ZHANG ◽  
Y. ZHANG ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Alloy Coating ◽  
Wear Behaviour ◽  
Air Plasma ◽  
X Ray ◽  
Wear And Corrosion ◽  
Before And After ◽  
Higher Temperature ◽  
Plasma Sprayed

NiCrBSi alloy coatings are widely used in wear and corrosion protection at higher temperature. As a primary hard phase forming element, B element can effectively improve the coating hardness. In this study, the low coefficient of friction of BN with three ratios (10%, 20%, and 30%) was added in order to reduce the wear rate and provide additional B element. The NiCrBSi/h-BN composite coatings were successfully prepared on a cast-iron substrate using supersonic air-plasma spray technology. The phase constitution, microstructure characterization, and microhardness of the coatings before and after oxyacetylene flame remelting were investigated by means of scanning electron microscope (SEM), X-ray diffraction, and energy dispersive analysis of X-ray techniques, respectively. The wear resistance of composite coatings was also tested in this paper. It was found that the microstructure was well refined by remelting treatment and this was beneficial for the adherence between the coating and the substrate, which was nearly 33[Formula: see text]MPa. The wear resistance of the NiCrBSi alloy coating was also improved with the increasing component of h-BN in remelted samples. When the h-BN content reached 30%, the friction coefficient decreased to 0.38 for the remelted coating. The effect of the remelting process on the anti-abrasive property and extension of the material’s wear life was quite important.

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