Investigation about Electro-Deposition Properties of Special Nickel Electroplating Coating for 45# Steel with Different Surface Roughnesses

2010 ◽  
Vol 146-147 ◽  
pp. 962-965 ◽  
Author(s):  
Wei Lin Zhao ◽  
Hui Huang ◽  
Zhen Lin Wang
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Adhesion Force ◽  
Surface Hardness ◽  
Lower Surface ◽  
Electro Deposition ◽  
Resistance Surface ◽  
Nickel Electroplating

The effects of the surface roughness on electro-deposition properties of the special nickel electroplating coating for the 45# steel were investigated. The results indicate that the surface roughness has great effects on the corrosion resistance and the surface hardness of the coating, the adhesion force between the coating and the substrate. Among the three 45# samples with different surface roughnesses, the sample with moderate surface roughness (Ra≈0.1um) has the relatively higher corrosion resistance, surface hardness and adhesion force than the samples with higher and lower surface roughness.

The Corrosion Resistance of Hard Anodised EN AW 7075 T6 Alloy

2021 ◽  
Vol 105 (1) ◽  
pp. 329-337
Author(s):  
David Kusmič ◽  
Lenka Klakurková ◽  
Martin Julis ◽  
Pavel Gejdoš ◽  
Jindrich Vilis ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Bulk Material ◽  
Surface Hardness ◽  
Hot Water ◽  
Initial Surface ◽  
Corrosion Properties ◽  
Resistance Surface ◽  
Hard Anodizing ◽  
Deaerated Solution ◽  
7075 Alloy

In this paper, commercially cold-rolled and artificial aged EN AW 7075 T6 alloy has been used. To ensure increased corrosion resistance, surface hardness, scratching resistance, and aesthetic features, this aluminium alloy was subsequently hard anodised and hot-water sealed (AC-A). The hard anodizing and sealing process increased surface hardness up to 304±13 HV 1 from an initial surface hardness of 194±3 HV 1. Also, the microhardness of the anodised layer and bulk material has been documented. Scanning electron microscopy (SEM) was used for microstructure and trapped precipitates investigation in the 42.9±1.4 thick formed anodised layer investigation. The T6 treated (AC) and hard anodised together with sealed (AC-A) EN AW 7075 alloy corrosion properties were evaluated using the anodic potentiodynamic polarisation tests (PPT) in a neutral 2.5% NaCl deaerated solution. The corrosion rate CR (mm/y) decreased approx. 39-times for the hard anodised and sealed EN AW 7075 alloy (AC-A), associated with the shift of the Ecorr (mV) to more positive values, degreased Icorr (µA) and increased Rp (Ohm) values compared to the artificial aged (AC) alloy. Additionally, the pitting was evaluated using laser confocal microscopy, and the pitting coefficient was also calculated.

scholarly journals PENGARUH SPUTTERING TiN TERHADAP KEKASARAN, KEKERASAN PERMUKAAN MATERIAL AISI316L

2019 ◽  
Vol 18 (3) ◽  
pp. 331-338
Author(s):  
Jemssy Ronald Rohi ◽  
Priyo Tri Iswanto ◽  
Tjipto Sujitno ◽  
Erich Umbu Kondi
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Corrosion Resistance ◽  
Deposition Time ◽  
Low Cost ◽  
Surface Hardness ◽  
The Body ◽  
Aisi 316L ◽  
Good Corrosion Resistance ◽  
Long Time

AISI 316L is widely used for implantation in orthopedic surgery due to its good corrosion resistance, mechanical properties and low cost. However, AISI 316L is not well suited for biocompatibility with the body, so implant material with AISI 316L can’t be used for a long time. One way to improve the corrosion resistance and mechanical properties of AISI 316L is to perform a surface treatment such as sputtering. This study discusses the effect of deposition sputtering TiN of 60, 90, 120 and 150 minutes on roughness and surface hardness at a ratio of argon gas and nitrogen to 80% Ar:20% N2. The results of the surface roughness value of the TiN sputtering layer deposited to AISI 316L for 60, 90, 120, and 150 minutes were 0.02 μm, 0.04 μm, 0.06 μm, and 0.04 μm respectively. This shows that the coating time of TiN in AISI 316L has no significant influence on value of surface roughness. Surface hardness results at 60, 90, 120, and 150 minutes were obtained with 268 HVN, 275 HVN, 278 HVN and 282 HVN. Increased hardness value, as the TiN thin layer has a higher hardness value compared to AISI 316L. The longer the deposition time, the more layers are formed and the layer becomes thicker. With the thickness of the layer, the density at the grain boundary increases. Because the higher density leads to grain growth, in which form micropores.

Properties and Corrosion Resistance of Borided AISI H11 Tool Steel

2019 ◽  
pp. 1-19
Author(s):  
Ali Günen
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Corrosion Resistance ◽  
Treatment Condition ◽  
Single Phase ◽  
Surface Hardness ◽  
Dual Phase ◽  
Barrier Effect ◽  
Mechanical Properties And Corrosion ◽  
Boriding Process

Abstract In this study, the effect of different boriding parameters on the some mechanical properties and corrosion resistance of AISI H11 steel, which is extensively used in hot and cold processing applications, was investigated. The grown boride layers were compact and crack-free for all boriding conditions and they were detected as single phase (Fe2B) at 800°C and dual phase (FeB+Fe2B) at 900 and 1000°C. Depending on the treatment condition, the thickness, surface hardness and Ra values of the coatings were ranged between 10.25-94.5 µm, 1704-2015 HV, and 0.285-0.650 µm, respectively. The corrosion resistance was observed to be related to the phase structure, coating thickness, surface roughness and the density of the boride layers. There found to be an increase in the corrosion resistance up to almost 65 times after the boriding process, due to the barrier effect of the grown boride layers (such as B2O3).

Study on Characteristics of ADI Coated DLC/ TiN /TiAlN Coatings by Cathodic Arc Evaporation

2006 ◽  
Vol 118 ◽  
pp. 257-264 ◽  
Author(s):  
Cheng Hsun Hsu ◽  
Jung Kai Lu ◽  
Ming Li Chen
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Surface Modification ◽  
Substrate Surface ◽  
Surface Hardness ◽  
High Carbon ◽  
Cathodic Arc Evaporation ◽  
Nodular Graphite ◽  
Arc Evaporation ◽  
Cathodic Arc

In this study, austempered ductile iron (ADI) substrate containing acicular ferrite and high-carbon austenite in the microstructure is made by austempering treatment at 360. Cathodic arc evaporation (CAE) coating technique was used to coat DLC, TiN and TiAlN films on ADI for surface modification. The results showed that the three coatings could be successfully coated onto ADI through CAE process without altering the unique microstructure of ADI. The structures of the coatings were identified by XRD, Raman and TEM, respectively. After HRC indentation testing, it was found that nodular graphite was the initial site of cracking for the coatings and then peeled. Surface roughness of all coated specimens was increased because the droplets generated on the substrate surface during the CAE process. Coated ADI had better wearability performance than uncoated ADI due to higher surface hardness. Coated specimens exhibited higher corrosion resistance than uncoated ones when they were immersed in separate solutions of both 3.5 wt. % NaCl and 10 vol. % HCl. In particular, TiAlN had the best corrosion resistance among the coated specimens.

scholarly journals Wear Performance of Boronized Layer of Iron-based Powder Metallurgy Materials

2021 ◽  
Author(s):  
Huimin FANG ◽  
Liansen XIA ◽  
Qingping YU ◽  
Guangsheng ZHANG
Keyword(s):  
Surface Roughness ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Wear Track ◽  
Surface Hardness ◽  
Lower Surface ◽  
Dual Phase ◽  
Wear Performance ◽  
Iron Based

Iron-based specimens with boronized layers were prepared by boriding at 800 ℃, 900 ℃ and 1000 ℃ for 3, 5, and 7 hours, respectively. The thickness, microstructure, surface roughness, friction, and wear performance were studied. Results showed that the process parameters such as temperature, the time of boriding have remarkable impact on the thickness of the boronized layer. Dual-phase was generated at 1000 ℃ which lead to increased brittleness, lower surface hardness, and decreased adhesion to the substrate. Compared with specimens boronized at 1000 ℃ and 800 ℃, the surface structure of the boronized layer of specimens boronized at 900 ℃ is denser and uniform, the wear track is not damaged. The average friction coefficient and mass loss by wear of specimens boronized at 900 °C are smaller than that of boronized at 1000 ℃ and 800 ℃, indicating that specimens borided at 900 ℃ behave excellent friction and wear performance.

scholarly journals The influence of soak temperature and forging lubricant on surface properties of steel forgings

2020 ◽  
Author(s):  
S. Hill ◽  
R. P. Turner ◽  
P. Wardle
Keyword(s):  
Surface Roughness ◽  
Surface Hardness ◽  
Lower Surface ◽  
Design Parameters ◽  
Compression Tests ◽  
Molybdenum Disulphide ◽  
Small Series ◽  
Ring Compression ◽  
Water Based ◽  
The Impact

AbstractA small series of ring compression tests were performed on BS970:708M40 alloy steel. The samples were tested using a 2-factor temperature variable, and a 4-factor lubricant variable, as the design parameters. Two differing soak temperatures were used, namely 1030 °C and 1300 °C respectively. The lubricants applied at the billet to tooling interface were synthetic water–based, graphite water–based, graphite and molybdenum disulphide viscous grease, and finally, unlubricated samples were tested. The ring compression tests were performed using a traditional drop forging hammer and induction heating to minimise any unintentional process variability. The impact that the two varying process parameters have upon the compression sample was then assessed by measuring each sample’s surface hardness and surface roughness prior to and post forging with fully calibrated equipment. It was demonstrated that the higher soak temperature of 1300 °C yielded a lower surface hardness value and higher surface roughness than the lower soak temperature, 1030 °C. The two water-based lubricants offered negligible change in results compared with the unlubricated forging, strongly suggesting that the lubricants were evaporated off the surface prior to forging. However, the results from the graphite–molybdenum disulphate grease do indicate in particular higher surface roughness than other lubricants, and a non-symmetric distortion pattern.

INVESTIGATION OF THE EFFECTS OF DIFFERENT RETROGRESSION AND RE-AGING PARAMETERS APPLIED TO THE 7075 ALLOY ON THE MICRO-ARC OXIDATION PROCESS

2021 ◽  
Vol 28 (09) ◽  
pp. 2150078
Author(s):  
MUSTAFA SAFA YILMAZ ◽  
GÖKHAN ÖZER ◽  
ORHAN ŞAHIN ◽  
AHMET KARAASLAN
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Surface Properties ◽  
Anode Voltage ◽  
Coating Layer ◽  
Surface Hardness ◽  
Process Time ◽  
Cathode Voltage ◽  
Open Time ◽  
Micro Arc Oxidation

In this paper, retrogression and re-aging (RRA) heat treatment was applied to 7075 aluminum alloy in T6 condition at different times (30 and 90[Formula: see text]min) and temperatures (180∘C and 240∘C). While RRA heat treatments increase the corrosion resistance of the material, it does not harm its mechanical properties. On the other hand, the surface resistance of aluminum is low. Surface modifications are applied to overcome this deficiency. Among these, the micro-arc oxidation (MAO) method increases the corrosion resistance and attains excellent values in surface hardness. To better understand the RRA/MAO relationship, heat-treated (RRA) samples with four different parameters were coated with the MAO method. In this way, a ceramic oxide coating layer was created on the material surfaces. In order to determine the RRA parameter effect, the MAO process parameters are kept constant (anode voltage ([Formula: see text]): 500[Formula: see text]V, cathode voltage ([Formula: see text]): 300[Formula: see text]V, anode voltage open time ([Formula: see text]: 300[Formula: see text][Formula: see text]s, cathode voltage open time ([Formula: see text]): 200[Formula: see text][Formula: see text]s, frequency: 160 coating with Hz, and process time: 20[Formula: see text]min). Surface properties (coating thickness, surface roughness, surface arc duct’s structure, etc.), phase analysis (X-ray diffraction (XRD)) and microstructures (coating cross-section studies: distance-dependent hardness, coating/backing material interface character, coating porosity ratio) were examined. XRD analysis showed that the main phase of the coatings is [Formula: see text]-Al2O3. A coating layer of around 125[Formula: see text][Formula: see text]m was achieved with the growth rate of 6[Formula: see text][Formula: see text]m/min. Surface roughness was between 5.5[Formula: see text][Formula: see text]m and 8[Formula: see text][Formula: see text]m for different RRA parameters. RRA/MAO relation with the characterization made was detailed, and predictions were made for the surface properties of the material (hardness, corrosion resistance, wear, etc.).

Effects of Tool Geometry and Workpiece Hardness on Surface Roughness in Finish Hard Turning of AISI 440C

2010 ◽  
Vol 97-101 ◽  
pp. 1815-1818
Author(s):  
Zhen Yu Shi ◽  
Zhan Qiang Liu
Keyword(s):  
Surface Roughness ◽  
Flow Stress ◽  
Hard Turning ◽  
Cutting Tool ◽  
Cutting Speed ◽  
Surface Hardness ◽  
Lower Surface ◽  
Tool Geometry ◽  
Workpiece Surface ◽  
Finish Hard Turning

In this study, the effects of cutting tool geometry and workpiece hardness on surface roughness in finish hard turning of AISI 440C steel were experimental investigated. Four-factor (hardness, tool geometry, feed rate and cutting speed) two-level fractional experiments were conducted and analysis of variance (ANOVA) was performed. This study showed that the effects of workpiece hardness and tool geometry on surface roughness are statistically significant. Especially lower workpiece surface hardness and larger tool nose angle resulted in lower surface roughness because that the surface hardness influences the workpiece’s flow stress and the tool nose angle changes the contact area between the cutting tool and workpiece.

Effect of Ultrasonic Surface Rolling Process Parameters on Surface Properties of S30408 Austenitic Stainless Steel

2020 ◽  
Vol 305 ◽  
pp. 111-116
Author(s):  
Rong Juan Sui ◽  
Zhen Hua Qin ◽  
Lei Yu Sun ◽  
Cheng Bin Fang ◽  
Xiao Mei Chen
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Corrosion Rate ◽  
Surface Properties ◽  
Process Parameters ◽  
Surface Hardness ◽  
Rolling Process ◽  
Step Size

S30408 austenitic stainless steel was treated by using hawking processing which is a type of ultrasonic surface rolling process (USRP). The effects of USRP parameters on surface roughness, surface hardness and corrosion resistance were investigated. Compared with the untreated specimen, the surface roughness and surface hardness is decreased by 87%, the surface hardness is increased by 51% and the corrosion rate reduces after USRP. The surface roughness decreases obviously as the step-size decreases, while the step-size has little effect on the surface hardness and corrosion resistance.

Surface Polishing of Plasma Carburized Austenitic Stainless Steel

2011 ◽  
Vol 391-392 ◽  
pp. 672-676
Author(s):  
Shao Mei Zheng ◽  
Cheng Zhao
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Surface Hardness ◽  
Surface Appearance ◽  
Surface Polishing ◽  
Aisi 316

After being plasma carburized, the surface of AISI 316 austenitic stainless steel was covered with a layer of compact black thin-film. The surface polishing treatment, electrochemical brightening was carried out to remove the black thin-film and renew the original color of the stainless steel. The surface appearance, microstructures, micro hardness, surface roughness and corrosion resistance of the samples treated by electrochemical brightening process were analyzed. Experimental results show that the electrochemical brightening treatment can remove the black thin-film from and restore the original color of the plasma carburized stainless steel. After electrochemical brightening treatment, the thickness and surface hardness of the carburized layer were all decreased little, but the corrosion resistance was improved significantly. And the surface roughness (Ra) was lower than before. Therefore, the electrochemical surface brightening treatment can be used to improve the surface quality of the austenitic stainless steel treated by plasma carburizing.

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