Study on Electroless Nickel Plating Process and Property of Aluminum Alloy

2013 ◽  
Vol 756-759 ◽  
pp. 60-63
Author(s):  
Xia Chang ◽  
Xiao Bin Zhang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Electroless Nickel ◽  
Optical Microscope ◽  
Nickel Plating ◽  
Binding Force ◽  
Wear And Corrosion ◽  
Heat Treated ◽  
The Matrix ◽  
Wear And Corrosion Resistance

Electroless nickle coating with plain and high binding force was obtained in this experiment .the samples were heat treated and diffused, then microstructure and transformation was investigated by optical microscope and scanning electron microscope. The hardness, binding force, wear and corrosion resistance are tested, the reasonable heat treatment process is gained. Hardness is increased after eletroless nickel plating and heat treatment compared with the matrix. The adhesion of sample heat treated at 400°C is highest, the weight loss and friction coefficient is lowest, the corrosion resistance is best..

Wear and Corrosion Resistance of Electroless Nickel-Boron Coated Mild Steel

2010 ◽  
Vol 638-642 ◽  
pp. 846-851 ◽  
Author(s):  
Abdoul Fatah Kanta ◽  
Véronique Vitry ◽  
Fabienne Delaunois
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Mild Steel ◽  
Electrochemical Impedance ◽  
Electroless Nickel ◽  
Uncoated Steel ◽  
Wear And Corrosion ◽  
Heat Treated ◽  
Wear And Corrosion Resistance ◽  
Hardening Heat Treatment

Nickel-boron coatings were synthesized on mild steel by the electroless deposition method. Some of the coatings were submitted to a hardening heat treatment at 400°C during 1 hour in an atmosphere containing 95% Ar and 5% H2. Uncoated steel, treated and untreated samples were submitted to the Taber abrasion test to assess their wear resistance. The wear track was then examined by SEM and roughness measurement. The Taber Wear Index of untreated samples was slightly better than that of steel but heat treated samples attained TWI as small as 13. The corrosion resistance of the samples was investigated by the way of polarization and electrochemical impedance spectroscopy (EIS) and the influence of the heat treatment was observed.

scholarly journals Influence of Boron Addition on the Microstructure and the Corrosion Resistance of CoCrMo Alloy

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 307 ◽  
Author(s):  
Marco Hernandez-Rodriguez ◽  
Dionisio Laverde-Cataño ◽  
Diego Lozano ◽  
Gabriela Martinez-Cazares ◽  
Yaneth Bedolla-Gil
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Passive Layer ◽  
Boron Addition ◽  
Joint Replacements ◽  
Treatment Conditions ◽  
Wear And Corrosion ◽  
Heat Treated ◽  
Wear And Corrosion Resistance

Cobalt-based alloys are extensively used in orthopedic applications for joint replacements due to their wear and corrosion resistance. Corrosion, however, is often associated with fatigue failure in these orthopedic devices. In this study, the effect of boron addition on the corrosion behavior of CoCrMo alloys was studied using linear polarization resistance, potentiodynamic polarization curves, electrochemical impedance spectroscopy, and cyclic voltammetry. The samples were analyzed under as-cast and heat treatment conditions after 21 days of immersion in phosphate-buffered saline (PBS) solution at 37 °C. The boron addition increased the particle content, while the heat treatment promoted enlargement and even distribution of the precipitates throughout the structure. The corrosion resistance was improved by both boron and heat treatments. The best performance was observed for a heat-treated alloy having a very small amount of boron, which had an increased resistance to corrosive attack. Such behavior was attributed to the homogenized microstructure achieved by boron and heat treatment that helped to form a stable passive layer of chromium oxide which endured the 21 days of immersion.

Anodizing of A356 T6 Alloys Obtained by Sub-Liquidus Casting

2008 ◽  
Vol 141-143 ◽  
pp. 755-760 ◽  
Author(s):  
Antonio Forn ◽  
Isabel Espinosa ◽  
Maite T. Baile ◽  
Elisa Rupérez
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Oxide Layer ◽  
Silicon Crystals ◽  
Wear And Corrosion ◽  
Coating Formation ◽  
Trapped Gas ◽  
Semi Solid ◽  
Wear And Corrosion Resistance ◽  
Coating Growth

Semi solid processing reduces porosity and amount of trapped gas and it allows heat treatment T6 that improves a hard anodized oxide layer. The aim of this work is to show the anodizing possibility of A356 T6 components conformed by Sub-liquidus Casting (SLC) to improve wear and corrosion resistance. This work compares the anodizing effect on tribological properties and corrosion resistance between components obtained by A6061 T6 extruded alloys and from A356 T6 produced by SLC. The effect of rounded silicon crystals on the coating formation and the fracture produced during the coating growth are described.

A Comparative Study on the Wear and Corrosion Resistance of Coatings

2016 ◽  
Vol 853 ◽  
pp. 441-445
Author(s):  
Cheng Zhou Chen ◽  
Wei Ze Wang ◽  
Kai Di Cheng
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Optical Microscope ◽  
Polymer Coatings ◽  
Negative Influence ◽  
Aluminum Coating ◽  
Wear And Corrosion ◽  
Bending Load ◽  
Wear And Corrosion Resistance ◽  
The Impact

The vessel containing sulfur particles has been found failing due to the effect of corrosion and erosion by the sulfur particles. Several coatings, including zinc-aluminum coating, wear-resistance painting and two kinds of polymer, have been provided to resist the negative influence of sulfur in the present study. The wear and corrosion resistance of the selected coatings has been measured to study the performance difference. Impact test has also been done to investigate the bonding condition of coatings under the impact or bending load. The microstructure of coatings before and after wear test is observed by the Optical Microscope (OM) and Scanning Electron Microscope (SEM). The experiment results reveal that one of the polymer coatings shows the best performance in the corrosion resistance, another polymer coating’s wear resistance is better than others. The coatings are bonded well with the substrate except the zinc-aluminum coating. The performance of painting is ordinary in this investigation.

Effect of Heat Treatment on Al-40Si Alloy Modified by Sr Addition

2011 ◽  
Vol 378-379 ◽  
pp. 108-111
Author(s):  
Wei Ke An ◽  
An Hui Cai ◽  
Xiang Fu Tan ◽  
Xiao Song Li ◽  
Yun Luo
Keyword(s):  
Heat Treatment ◽  
Optical Microscope ◽  
Heat Treatment Condition ◽  
Solution Temperature ◽  
Primary Si ◽  
Optimal Heat Treatment ◽  
Heat Treated ◽  
Optimal Value ◽  
The Matrix ◽  
Temperature Solution

The Al-40Si alloy modified by 1.0 wt% Sr addition was heat-treated using L9(34) orthogonal test. The mechanical properties were measured. The microstructures were analyzed using optical microscope. After heat treatment, the hardness decreases about one times. The eutectic matrix and primary Si phase are both refined. The primary Si phase is refined and homogeneously distributes in the matrix with the solution temperature and time increasing. The optimal heat treatment condition is that the solution temperature, solution time, aging temperature, and aging time are 550 °C, 18 hours, 200 °C, and 5 hours, respectively. In addition, the theoretical optimal value for the hardness is 20.6 HRC, which is coherent with the practical optimal value.

Heat Treatment Technology for Al-40Si Alloy Modified by Sr Addition

2011 ◽  
Vol 697-698 ◽  
pp. 483-486 ◽  
Author(s):  
Wei Ke An ◽  
A.H. Cai ◽  
X.F. Tan ◽  
X.S. Li ◽  
J.J. Zeng ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optimal Solution ◽  
Optical Microscope ◽  
Solution Temperature ◽  
Treatment Technology ◽  
Primary Si ◽  
Heat Treatment Technology ◽  
Heat Treated ◽  
The Matrix ◽  
Optimal Values

The Al-40Si alloy modified by 0.5 wt% Sr addition was heat treated using L9(34) orthogonal test. The mechanical properties were measured. The microstructures were analyzed using optical microscope. After heat treatment, the extension percentage increases more than twice. The eutectic matrix and primary Si phase are both refined. The primary Si phase is refined and homogeneously distributes in the matrix with the solution temperature and time increasing. However, the primary Si phase agglomerates each other with further increasing of the solution temperature and time. According to the microstructure, the optimal solution temperature and time are 500 °C and 14 hours, respectively. In addition, the optimal values for the hardness, tensile strength, and extension percentage are 35.4 HRC, 82.2 MPa, and 2.05 %, respectively.

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.

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