Corrosion and Wear Behavior of Electroless Nickel Coatings

2020 ◽  
pp. 210-227
Author(s):  
Suman Kalyan Das ◽  
Supriyo Roy ◽  
Prasanta Sahoo
Keyword(s):  
Heat Treatment ◽  
Wear Behavior ◽  
Current Source ◽  
High Hardness ◽  
Electroless Nickel ◽  
Treatment Temperature ◽  
Corrosion And Wear ◽  
Uniform Coating ◽  
Nickel Coatings ◽  
Electroless Coatings

This chapter describes how corrosion is the degradation of a material due to a reaction with its environment. Wear is another deteriorating phenomenon which erodes the contacting surfaces of any mechanical component gradually. Although corrosion and wear are two different phenomenon they are often interdependent and in most practical situations take place simultaneously. Fortunately, several surface modification methods exist which can protect the surface of metal against corrosion and wear. Among them, electroless nickel coatings is a technology where a coating is applied without the use of external current source. The primary advantages of electroless coatings include uniform coating and ability to coat non-conductive materials. Electroless nickel coatings possess excellent properties such as high hardness, good wear resistance and corrosion resistance. The corrosion and wear behavior of these coatings mainly depend on bath ingredients, deposition conditions, heat treatment temperature, etc.

Effect of Heat Treatment Temperature and Lubricating Conditions on the Fretting Wear Behavior of SAF 2507 Super Duplex Stainless Steel

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Mengjiao Wang ◽  
Yunxia Wang ◽  
Jianzhang Wang ◽  
Na Fan ◽  
Fengyuan Yan
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Duplex Stainless Steel ◽  
Wear Behavior ◽  
Treatment Temperature ◽  
Fretting Wear ◽  
Super Duplex Stainless Steel ◽  
Wear Performance ◽  
Seawater Lubrication

Super duplex stainless steel (SDSS) has excellent mechanical properties and corrosion resistance. However, currently, there are few researches conducted on its fretting wear performance. This paper studies the influence of different heat treatment temperatures and medium environment on the fretting wear performance of SAF 2507 SDSS. Results show that the combined effect of the sigma phase and seawater lubrication can significantly improve the wear resistance of SAF 2507 SDSS. After treated with different heat treatment temperatures, different contents of sigma phases are precipitated out of SAF 2507 SDSS, which improves the wear resistance of the material to different degrees. In addition, the fretting wear performance of SAF 2507 SDSS also relates to the lubrication medium. In air, the friction and wear performance of SAF 2507 SDSS is poor, while in seawater, solution and corrosion products that acted as a lubricant dramatically improve the wear resistance of the material. Under the combined action of heat treatment and seawater lubrication medium, the friction coefficient and wear reduce by 70% and 91%, respectively.

The Effects of the Aging Temperature on the Microstructure and Corrosion Resistance of the Nickel-Phosphorus Composite Al2O3 Deposit

2012 ◽  
Vol 217-219 ◽  
pp. 101-104
Author(s):  
Li Ming Lian ◽  
Fang Fang Yan
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aging Temperature ◽  
Corrosion Test ◽  
Steel Surface ◽  
Annealing Temperature ◽  
Electroless Nickel ◽  
Major Elements ◽  
Treatment Temperature ◽  
Chemical Plating

In this Paper, electroless nickel-phosphorus composite of Al2O3 deposit is prepared by chemical plating on 45 steel. Surface topography, microstructure and major elements are analyzed by SEM, EDS and XRD. The results show that the deposit is compact and the binding of the coating interface is very good. It is found that the microstructure of deposit is amorphous and after heat treatment is crystalline. Corrosion test showed that the coating's corrosion resistance is related to heat treatment temperature. It exhibits better corrosion resistance at annealing temperature of 250°C.

Phase Transformation, Microstructure and Hardness of Electrodeposited Fe-Based Amorphous Coatings

2011 ◽  
Vol 467-469 ◽  
pp. 365-368
Author(s):  
Yun Ying Fan ◽  
Ye Hua Jiang ◽  
Rong Zhou
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Corrosion Resistance ◽  
Phase Transformation ◽  
Heat Treatment Temperature ◽  
High Hardness ◽  
Treatment Temperature ◽  
Dispersed Phase ◽  
Good Corrosion Resistance ◽  
Amorphous Coatings

Fe-based amorphous coatings have many excellent performances, such as good corrosion resistance, high hardness, satisfactory magnetism, etc. In this paper, Fe-P amorphous coatings were prepared by electrodeposition method, and the phase transformation, microstructure, and hardness of the coatings heated at different heat-treatment temperature were investigated. The results show that Fe-P amorphous coatings begin to crystallize when heated at 300°C, the α-Fe(P) solid solution appears when heated at 330°C, and FexP(X=1,2,3) compounds separate out from the solid solution when heat-treatment temperature is up to 370°C. During the process of heat-treatment, hardness of the Fe-P coating increases as the reinforcement result of solid solution and dispersed phase in the coatings, and the hardness reaches the maximum 1100 HV at 370°C. When heat-treatment temperature is higher than 460°C, dispersed phase in the coatings will grow up, which is called Ostwald Coarsening Phenomenon, and hardness of the coating decreases quickly.

Characteristics of Electroless Nickel-Phosphorus-Potassium Titanate Whisker Composite Coating

2012 ◽  
Vol 472-475 ◽  
pp. 70-73
Author(s):  
Ya Xu Jin ◽  
Yu Ming Tian ◽  
Qiu Shu Li
Keyword(s):  
Heat Treatment ◽  
Composite Coating ◽  
Composite Coatings ◽  
Electroless Nickel ◽  
Medium Carbon Steel ◽  
Treatment Temperature ◽  
X Ray Diffraction ◽  
Potassium Titanate ◽  
Steel Substrates ◽  
Electroless Ni

Electroless nickel plating with potassium titanate whisker was co-deposited on medium carbon steel substrates. The microstructure of the composite coatings was investigated. The effect of aging temperature on the microstructure of the composite coatings was studied using X-ray diffraction. The results indicate that the composite coatings will turn into crystal state with increasing heat treatment temperature. Experimental results also show that a maximum hardness is achieved for the composite coating after heat treatment at 400°C for 1 hour. The corrosion resistance and tribological properties of the composite coatings are not inferior to those of electroless Ni-P coating.

Modification of Electroless Nickel-Plating Coatings with Sol-Gel Film

2005 ◽  
Vol 475-479 ◽  
pp. 3835-3838 ◽  
Author(s):  
Hui Cong Liu ◽  
Liqun Zhu ◽  
Yan Bin Du
Keyword(s):  
Heat Treatment ◽  
Oxidation Resistance ◽  
Sol Gel ◽  
Electroless Nickel ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Gel Film ◽  
Sol Gel Films ◽  
Corrosion And Oxidation

Four Sol-Gel films were developed by dip-coating electroless nickel-plated samples in different Sols, followed by heat treatment. The effects of the coating times and heat treatment temperature on the corrosion, oxidation resistance and wearing quality of the modified coating were examined. Results show that, after six coating, Sol-Gel films obtained can provide good corrosion and oxidation resistance, and their anti-corrosion quality remains high even after being oxidized at 500 °C for 60 hours. Addition of inorganic molybdenum salt or chromate into the Ti Sol also makes the wearing quality of the Sol-Gel film better.

Comparison of Various Electroless Nickel Coatings on Steel: Structure, Hardness and Abrasion Resistance

2014 ◽  
Vol 783-786 ◽  
pp. 1405-1413 ◽  
Author(s):  
Véronique Vitry ◽  
Adeline Sens ◽  
Fabienne Delaunois
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Steel Substrate ◽  
Steel Structure ◽  
Electroless Nickel ◽  
Scratch Testing ◽  
Nickel Coatings ◽  
Heat Treated ◽  
Nickel Deposits ◽  
Heat Treated Condition

Several electroless nickel deposits, on steel substrate, of varying chemistry were investigated in the as-plated and heat-treated condition: 3 nickel-phosphorous (low, mid and high P) and 2 nickel-boron (nickel-boron (lead) and nickel-boron (thallium)). Samples were characterized by SEM and X-ray diffraction. They were then submitted to Knoops microhardness testing and Taber abrasion tests, with abrasive CS-10 wheels, as well as scratch testing to investigate their mechanical properties and wear resistance. Hardness and wear resistance of all deposits were improved by heat treatment, but the best candidate was the Nickel-boron (lead), with a hardness over 1100 hk50 after heat treatment and a Taber Wear Index of 6. Scratch testing allowed identifying the damage mechanisms of the coated systems.

scholarly journals Effect of Vacuum Heat Treatment on Microstructures and Mechanical Properties of 7A52 Aluminum Alloy-Al2O3 Ceramic Brazed Joints

2021 ◽  
Vol 8 ◽  
Author(s):  
Deku Zhang ◽  
Xusheng Qian ◽  
Xiaopeng Li ◽  
Kehong Wang
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Electroless Nickel ◽  
Amorphous Structure ◽  
Treatment Temperature ◽  
Vacuum Heat Treatment ◽  
Joint Shear Strength ◽  
Welding Temperature ◽  
7A52 Aluminum Alloy ◽  
Brazed Joints

This study investigated the interface morphology, microstructure composition and connection strength of 7A52 aluminum alloy-Al2O3 ceramic brazed joints under heat treatment conditions. Alumina ceramics were first treated with electroless nickel plating, followed by vacuum heat treatment at different temperatures. Then an Al-Si-Mg intermediate layer was placed between the treated alumina ceramic and 7A52 aluminum alloy for brazing under the conditions of welding temperature 590, holding time 1h, pressure 2 MPa. Results showed that when heat treatment was performed at 350°C and below, the nickel-plated metal had an amorphous structure, and when performed at 400°C, the nickel-plated layer had a crystalline structure and the brittle phase Ni3P was precipitated. When the heat treatment temperature was 350°C, the joint shear strength reached the maximum, which was 68.7 MPa.

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