scholarly journals Effects of Graphene on the Wear and Corrosion Resistance of Micro-Arc Oxidation Coating on a Titanium Alloy

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 70
Author(s):  
Ruifang Zhang ◽  
Kai Lv ◽  
Zhaoxin Du ◽  
Weidong Chen ◽  
Pengfei Ji ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Adhesion Force ◽  
Salt Spray ◽  
Micro Cracks ◽  
Wear And Corrosion ◽  
Micro Holes ◽  
Micro Arc Oxidation ◽  
Wear And Corrosion Resistance ◽  
Micro Morphology ◽  
Wear Tests

In order to improve the wear and corrosion resistance of micro-arc oxidation (MAO) coating on a Ti-5Al-1V-1Sn-1Zr-0.8Mo alloy, 0–0.20 g/L graphene was added to the electrolyte to prepare micro-arc oxidation coating. The thickness, roughness, micro-morphology, and composition of the MAO coating were characterized, and the wear and corrosion resistance of the coating was tested and analyzed. The results show that with 0.05 g/L of graphene in the electrolyte, the roughness of the coating decreased from 56.76 μm to 31.81 μm. With the increase in the addition of graphene, the microstructure of the coating became more compact, the diameter of micro-holes and micro-cracks decreased, and the corrosion resistance of the coating improved. The wear tests showed that the mass loss of the coating at the early wear stage (0~100 revolutions) was greater than that at the later stage (100~250 revolutions), and the wear resistance of the coating obtained by the addition of 0.10 g/L of graphene was the highest. With 0.10 g/L of graphene, the adhesion force between the coating and the substrate alloy is the largest, reaching 57.1 N, which is 9.98 N higher than that without graphene. After salt spray corrosion for 480 h, the coating with graphene has better corrosion resistance than that of a graphene-free coating.

scholarly journals Characterization of Electroless Nickel–Boron Deposit from Optimized Stabilizer-Free Bath

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 576
Author(s):  
Muslum Yunacti ◽  
Alexandre Mégret ◽  
Mariana Henriette Staia ◽  
Alex Montagne ◽  
Véronique Vitry
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Indentation Test ◽  
Electroless Nickel ◽  
Industrial Applications ◽  
Toxic Heavy Metal ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance ◽  
Instrumented Indentation Test

Conventional electroless nickel–boron deposits are produced using solutions that contain lead or thallium, which must be eliminated due to their toxicity. In this research, electroless nickel–boron deposits were produced in a stabilizer-free bath that does not include any toxic heavy metal. During processing, the plating rate increased from 10 to 14.5 µm/h by decreasing the concentration of the reducing agent, leading to increased bath stability. The thickness, composition, roughness, morphology, hardness, wear, and corrosion resistance of the deposits were characterized. The new deposit presents an excellent hardness of 933 ± 56 hv50, 866 ± 30 hk50, and 12 GPa from the instrumented indentation test (IIT), respectively, which are similar to that of hexavalent hard chromium coating. Moreover, by using both potentiodynamic polarization and salt spray tests it was shown that the coating presents higher corrosion resistance as compared to standard nickel-boron coatings. The new deposit exhibits properties close to those of the conventional electroless nickel–boron deposits. Therefore, it could replace them in any industrial applications.

Effect of Processing Parameters on the Structural and Mechanical Properties of Micro Arc Oxidized Aluminium Alloy

2010 ◽  
Vol 297-301 ◽  
pp. 942-947
Author(s):  
Isa Metin Ozkara ◽  
Murat Baydogan
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Xrd Analysis ◽  
Processing Parameters ◽  
Morphological Characterization ◽  
Cross Sectional ◽  
Wear And Corrosion ◽  
Thickness Gage ◽  
Micro Arc Oxidation ◽  
Wear And Corrosion Resistance

The micro arc oxidation process (MAO) was applied to a 2024 ingot aluminium alloy by an AC MAO equipment using an alkali based electrolyte. The processing parameters of the process were positive and negative voltage pulse durations. Structural and morphological characterization of the coating were made by a scanning electron microscope (SEM), an X-ray diffractometer (XRD), a surface profilometer and a thickness gage operating according to the Eddy current principle. Cross sectional hardness of the coatings was measured, and reciprocating wear and immersion corrosion tests were performed. XRD analysis showed that an oxide layer comprising - and -Al2O3 phases was produced on the surface, whose thickness and surface roughness varied by the processing parameters applied. Wear and corrosion resistance of the original alloy significantly improved upon the MAO process. Variation of hardness, wear and corrosion resistance with respect to the processing parameters was discussed based on the experimental data obtained.

TANTUNG G

Alloy Digest ◽  
1961 ◽  
Vol 10 (7) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Cutting Tools ◽  
Heat Treating ◽  
Nonferrous Alloy ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

Abstract TANTUNG G is a cast nonferrous alloy containing tantalum or columbium carbide and having wear and corrosion resistance. It is used primarily for cutting tools. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: Co-28. Producer or source: Vascoloy, Ramet Division.

ALLEGHENY LUDLUM TYPE 420

Alloy Digest ◽  
2000 ◽  
Vol 49 (8) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance ◽  
Chromium Stainless Steel

Abstract Allegheny Ludlum Type 420 is a hardenable, straight-chromium stainless steel with wear and corrosion resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: SS-801. Producer or source: Allegheny Ludlum Corporation.

NIROSTA 4031

Alloy Digest ◽  
2005 ◽  
Vol 54 (4) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

Abstract Nirosta 4031 (Type 420) is a martensitic grade of stainless steel that is heat treatable and has wear and corrosion resistance. It is predominately used in the quenched-and-tempered condition. Typical applications are blades and shears for all types of cutting. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SS-925. Producer or source: ThyssenKrupp Nirosta GmbH.

scholarly journals Preparation and Properties of Mo Coating on H13 Steel by Electro Spark Deposition Process

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3700
Author(s):  
Wenquan Wang ◽  
Ming Du ◽  
Xinge Zhang ◽  
Chengqun Luan ◽  
Yingtao Tian
Keyword(s):  
Corrosion Resistance ◽  
Service Life ◽  
Deposition Time ◽  
Deposition Process ◽  
H13 Steel ◽  
Carbide Phases ◽  
Metallurgical Bonding ◽  
Wear And Corrosion ◽  
Deposition Power ◽  
Wear And Corrosion Resistance

H13 steel is often damaged by wear, erosion, and thermal fatigue. It is one of the essential methods to improve the service life of H13 steel by preparing a coating on it. Due to the advantages of high melting point, good wear, and corrosion resistance of Mo, Mo coating was fabricated on H13 steel by electro spark deposition (ESD) process in this study. The influences of the depositing parameters (deposition power, discharge frequency, and specific deposition time) on the roughness of the coating, thickness, and properties were investigated in detail. The optimized depositing parameters were obtained by comparing roughness, thickness, and crack performance of the coating. The results show that the cross-section of the coating mainly consisted of strengthening zone and transition zone. Metallurgical bonding was formed between the coating and substrate. The Mo coating mainly consisted of Fe9.7Mo0.3, Fe-Cr, FeMo, and Fe2Mo cemented carbide phases, and an amorphous phase. The Mo coating had better microhardness, wear, and corrosion resistance than substrate, which could significantly improve the service life of the H13 steel.

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