scholarly journals Effects of Chemical Compositions on Plating Characteristics of Alkaline Non-Cyanide Electrogalvanized Coatings

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2101
Author(s):  
Thanyalux Wanotayan ◽  
Pongsakorn Kantichaimongkol ◽  
Viriyah Chobaomsup ◽  
Sirikarn Sattawitchayapit ◽  
Klaus Schmid ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Residual Stresses ◽  
Sodium Hydroxide ◽  
Deposition Rate ◽  
Chemical Compositions ◽  
High Deposition Rate ◽  
Zinc Bath ◽  
Throwing Power ◽  
Coating Surface ◽  
Coating Uniformity

The effects of zinc and sodium hydroxide concentrations in an alkaline non-cyanide zinc bath on the electrodeposition characteristics of zinc deposits are systematically investigated. Using microstructural and phase analyses of specimens with specifically designed geometries, the study indicates that the bath formulations critically control the electrogalvanizing characteristics and affect the coating surface morphology, deposition rate, throwing power, coating uniformity, and residual stresses developed during and after electrogalvanizing. The coatings produced from baths with a moderate Zn-to-NaOH ratio of 0.067–0.092 appear to provide uniform and compact deposits, moderately high deposition rate, and relatively low residual stresses.

Effects of Complexing Agent Concentration and Bath pH on Electroless Nickel Deposition for Tungsten Carbide Powders

2014 ◽  
Vol 970 ◽  
pp. 240-243 ◽  
Author(s):  
Pranee Rattanawaleedirojn ◽  
Kanokwan Saengkiettiyut ◽  
Yuttanant Boonyongmaneerat ◽  
Nutthita Chuankrerkkul ◽  
Sawalee Saenapitak
Keyword(s):  
Tungsten Carbide ◽  
Deposition Rate ◽  
Electroless Nickel ◽  
Powder Injection ◽  
Complexing Agent ◽  
Chemical Compositions ◽  
High Deposition Rate ◽  
Nickel Deposition ◽  
Moulding Process ◽  
Injection Moulding Process

An elemental nickel (Ni) or cobalt (Co) is typically introduced to tungsten carbide (WC) prior to powder injection moulding process (PIM) for hard metal fabrication to enhance toughness and tool life. Mixing of powders is normally practiced, although it requires a long processing time for homogeneous mixing. In this study, as an alternative method, an addition of Ni via the electroless deposition method is investigated. The key process parameters, including the concentration of the complexing agent, namely sodium citrate, and bath pH, are systematically examined in relation to deposition rate and deposits size, microstructure, and chemical compositions. As the bath pH is increased to higher alkalinity of 10 and the Ni ion to complexing agent mole ratio is controlled under 1:1, a stable electroless nickel solution and a relatively high deposition rate with about 15% weight gain for 1 hour deposition duration are achieved. The phosphorus (P) content, obtained in the range of 5-9 wt%, is largely influenced by the bath pH. While a rapid deposition rate is associated with preferentially deposition of Ni on pre-deposited Ni sites, a low to moderately high deposition rate results in more uniform incorporation of Ni-P alloys in WC powder mixture.

The Effect of NaOH on the Surface of Magnesium Alloy Ni-B Alloy Plating Properties

2011 ◽  
Vol 189-193 ◽  
pp. 347-350 ◽  
Author(s):  
Qing Hua Chang ◽  
Zhen Zhen Chang ◽  
Yu Ting Bai ◽  
Xiao Yu Chen ◽  
Die Peng
Keyword(s):  
Magnesium Alloy ◽  
Sodium Hydroxide ◽  
Deposition Rate ◽  
Electroless Plating ◽  
Boron Content ◽  
Optimal Concentration ◽  
Sodium Hydroxide Concentration ◽  
Coating Morphology ◽  
Coating Uniformity ◽  
Alloy Plating

In this paper, the effect of different concentrations of sodium hydroxide on the surface of magnesium alloy plating Ni-B alloys is studied. Focuse on the influence of different NaOH concentrations on electroless plating Ni-B alloy plating rate, coating morphology, and composition. Ascertain the optimal concentration of NaOH. The results showed that when the sodium hydroxide concentration is 50g / L, the deposition rate is the maximum, coating uniformity, structure compact, and boron content in the coating is the maximum.

The Properties of Al2O3 Films Deposited onto Al2O3-TiC and Si Substrates by RF Diode Sputtering

2013 ◽  
Vol 313-314 ◽  
pp. 126-130
Author(s):  
H. Panitchakan ◽  
Pichet Limsuwan
Keyword(s):  
Surface Morphology ◽  
Deposition Rate ◽  
Film Stress ◽  
Deposition Condition ◽  
High Deposition Rate ◽  
Substrate Bias ◽  
Si Substrate ◽  
Al2o3 Film ◽  
Film Properties ◽  
Substrate Bias Voltage

The Al2O3 films were deposited onto Al2O3-TiC and Si (100) substrates by RF sputtering technique by varying powers sputter target, substrate bias voltages and fixed process pressure 25 mTorr which aim to achieve high deposition rate and investigated film properties onto different types. Result showed significant power sputter target to deposition rate both substrates and film properties depend on type of substrate. The power sputter target at 8kW and substrate bias voltage at -150 V is optimum deposition condition to provide deposition rate is 53.97nm/min for Al2O3-TiC substrate and 51.50nm/min for Si substrate. The Al2O3 film deposited onto Al2O3-TiC substrate surface morphology displayed rather roughness than Al2O3 film deposited onto Si substrate which verified from SEM and AFM as 0.99 nm (Ra) versus 0.46 nm (Ra). The film stress, hardness, reduces modulus and breakdown voltage (BDV) of Al2O3 film deposited were higher than Al2O3 film deposited on Al2O3-TiC substrates which were correspond to surface morphology.

Parameter Optimization of High Deposition Rate Laser Cladding Based on the Response Surface Method and Genetic Neural Network Model

2021 ◽  
Vol 48 (6) ◽  
pp. 0602112
Author(s):  
庞祎帆 Pang Yifan ◽  
傅戈雁 Fu Geyan ◽  
王明雨 Wang Mingyu ◽  
龚燕琪 Gong Yanqi ◽  
余司琪 Yu Siqi ◽  
...  
Keyword(s):  
Neural Network ◽  
Response Surface ◽  
Response Surface Method ◽  
Deposition Rate ◽  
Network Model ◽  
Parameter Optimization ◽  
Neural Network Model ◽  
High Deposition Rate ◽  
Surface Method ◽  
Genetic Neural Network

Influence of Heat Treatment on Characteristic Behavior of Co-Based Alloy Hardfacing Coatings Deposited by Plasma Transferred Arc Welding

2011 ◽  
Vol 462-463 ◽  
pp. 593-598 ◽  
Author(s):  
Hong Xia Deng ◽  
Hui Ji Shi ◽  
Seiji Tsuruoka ◽  
Hui Chen Yu ◽  
Bin Zhong
Keyword(s):  
Residual Stresses ◽  
Vickers Hardness ◽  
Arc Welding ◽  
Steel Substrate ◽  
Heat Treatments ◽  
Material System ◽  
Coating Surface ◽  
Plasma Transferred Arc ◽  
Transferred Arc ◽  
Plasma Transferred Arc Welding

The Plasma transferred arc welding (PTAW) is widely used for hardfacing components exposed to severe conditions. Without post welding heat treatments, large tensile residual stresses remain in the hardfacing coating, which is detrimental. In this paper, a set of post welding heat treatments was evaluated for the heat-resistant steel substrate – Co-based alloy hardfacing coating system. Microstructural and mechanical properties, including the chemical phases of coating surface, the microstructure of coating surface, the Vickers hardness and the residual welding stress, were investigated before and after the heat treatments. Results revealed that during the heat treatments, some elements reprecipitated and the secondary carbide Cr23C6 was formed. After the treatments, a more regular structure and a higher Vickers hardness were obtained. Moreover, the tensile residual stresses in the coating decreased significantly. Therefore, it can be inferred that the post welding heat treatments employed in this paper were proper for this material system.

Low-loss fibre prepared under high deposition rate by modified c.v.d. technique

1977 ◽  
Vol 13 (20) ◽  
pp. 608 ◽  
Author(s):  
K. Yoshida ◽  
Y. Furui ◽  
S. Sentsui ◽  
T. Kuroha
Keyword(s):  
Deposition Rate ◽  
High Deposition Rate ◽  
Low Loss
Sign in / Sign up

Export Citation Format

Share Document