Journal ArticleDOI
Effect of coating time and heat treatment on structures and corrosion characteristics of electroless Ni-P alloy deposits
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TLDR
In this article, the effect of coating time on phosphorus content, thickness, structure and hardness of the deposits were analyzed, and the X-ray diffraction patterns showed that by changing the coating times, amorphous or crystalline structure could be obtained.Abstract:
Mild steel was electroless coated with nickel–phosphorus alloy from a bath containing sodium hypophosphite and glycin–citrate complexing agents. The effect of coating time on phosphorus content, thickness, structure and hardness of the deposits were analyzed. Corrosion parameters such as current density, corrosion potential and corrosion rate were obtained from tafel polarization curves and immersion corrosion tests in aerated 3.5% NaCl solution. The X-ray diffraction (XRD) patterns, anodic polarization curves and scanning electron microscopy (SEM) of heat-treated specimens obtained in various coating times were also studied. The X-ray diffraction patterns showed that by changing the coating times, amorphous or crystalline structure could be obtained. The coatings containing 11.1–13.1% phosphorous were amorphous, and showed better corrosion resistance than microcrystalline structure. The heat-treated specimens obtained in different coating time had more hardness and corrosion resistance than unheated samples. According to the polarization studies and scanning electron microscopy images, the heat-treated samples with 10.8 and 10.1% phosphorous show the intergranular corrosion, while the coatings with 11.7 and 12.2% of phosphorus have the least corrosion rate. Immersion corrosion test data at the 4-month interval had good agreement with electrochemical polarization results.read more
Citations
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Journal ArticleDOI
Tribology of electroless nickel coatings – A review
Prasanta Sahoo,Suman Das +1 more
TL;DR: In this article, the authors reviewed the tribological advancement of different electroless nickel coatings based on the bath types, structure and also the tribo testing parameters in recent years.
Journal ArticleDOI
The development supercapacitor from activated carbon by electroless plating—A review
Soheila Faraji,Farid Nasir Ani +1 more
TL;DR: In this paper, the performance of metal oxide thin film electrodes on activated carbon has been evaluated in the context of supercapacitors, showing that metal oxide films will play a major role in super-capacitor technology and are expected to significantly develop the capabilities of these devices in the near future.
Journal ArticleDOI
Electroless Nickel Plating – A Review
TL;DR: In this article, a review of the electroless nickel plating of mild steel is presented, focusing on the past and the present published research in this field, both past and present published literature information, both of the past literature information and current published research.
Journal ArticleDOI
Electroless nickel plating on AZ91 Mg alloy substrate
Zhenmin Liu,Wei Gao +1 more
TL;DR: In this article, the effect of the substrate microstructure and roughness on the deposition rate, nucleation, and mechanical properties of Ni-plating on Mg alloy AZ91 has been investigated.
Journal ArticleDOI
A review on conducting polymer coatings for corrosion protection
TL;DR: The most important problems in the manufacturing industry are corrosion control methods use coatings of conducting polymers and conversion layers that contain toxi... as discussed by the authors. But, the most important problem in manufacturing industries is corrosion control of metals.
References
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Journal ArticleDOI
Corrosion resistance of ternary NiP based alloys in sulfuric acid solutions
Guojin Lu,Giovanni Zangari +1 more
TL;DR: In this article, Ni-P-based alloy films were prepared by autocatalytic deposition and their structure, chemistry and corrosion behaviors in sulfuric acid solutions were studied as a function of their composition.
Journal ArticleDOI
The Structure and Mechanical Properties of Electroless Nickel
TL;DR: In this article, the effects of variations in phosphorus content of electroless nickel from 4.6 to 9.4 w/o on structure, strength, ductility, and hardness were studied.
Journal ArticleDOI
Role of phosphorus in the electrochemical behavior of electroless Ni-P alloys in 3.5 wt.% NaCl solutions
TL;DR: In this paper, the effect of phosphorus on the corrosion behavior of electroless nickel-plated mild steel in neutral and alkaline 3.5 wt.% NaCl solutions was examined using d.c. polarization curves and a.
Journal ArticleDOI
Effects of ligands on electroless Ni–P alloy plating from alkaline citrate–ammonia solution
TL;DR: In this paper, a ternary nickel citrate-ammonia complex was detected in alkaline electroless baths, which supports the explanation of a proposed mechanism involving a Ternary complex as the discharge species.
Journal ArticleDOI
Structure and wear of electroless nickel coatings
D. T. Gawne,U. Ma +1 more
TL;DR: In this article, a heat treatment process was used to change the structure of amorphous nickel to Ni3P and fcc nickel by a mechanism similar to that of the solidification of liquid alloys.
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