An investigation over the effect of the reducing agent on the properties of the ZnO-reinforced Ni–P coatings

Chintada, Vinod Babu; Gurugubelli, Thirumala Rao; Koutavarapu, Ravindranadh

doi:10.1007/s10854-021-07366-4

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…Amongst several coating deposition method, the electroless technique has been well accepted by industries due to the deposit uniformity, enhanced tribological behaviour and corrosion resistance [1]. In a quest to attain improved properties nano-composite electroless nickel coatings have been also investigated recently [2,3]. ENB coatings are the wear resistant variants in the electroless family and are used in automotive ball joint assembly, pistons, valves, greaseless armaments, tunnel thrusters, pumps, propellors, etc [1].…”

Section: Introductionmentioning

confidence: 99%

“…ENB deposits show improved surface hardness, friction and wear behaviour on aluminium substrate along with enhanced adhesion [05,23]. In fact, one of the primary advantage of EN coatings is the ability to surface engineer a wide variety of substrates i.e., magnesium, aluminium, steel, etc to improve its tribological behaviour and enhanced corrosion resistance [2,3,5,14,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Development of Ni-B electroless coating from stabilizer free bath and characterization of high temperature tribological behaviour, scratch and corrosion resistance

Agrawal¹,

Mukhopadhyay²

2022

Surf. Topogr.: Metrol. Prop.

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The current work investigates the effects of variation of coating bath temperature on friction and wear behaviour of electroless Ni–B (ENB) coatings developed from stabilizer free bath. Coating is applied to specimens made up of AISI 1040 steel. Coatings were deposited at three different coating bath temperatures (85°C, 90°C and 95°C). Field emission scanning electron microscopy, inductively coupled plasma-optical emission spectrometer, and X-ray diffraction were used to characterize the coating for surface morphology, chemical composition, and phase structure respectively. Pin-on-disc tribo-tester was used to estimate the friction and wear behaviour of ENB coatings at room temperature (25ºC), 100ºC, 200ºC and 300ºC. The coefficient of friction was higher at high temperature due to higher roughness of the coatings obtained from stabilizer free bath, adhesion and ploughing. The wear rate at 200°C or 300°C was lower compared to 100°C. Additionally, the ENB coatings were subjected to thermogravimetric analysis which reveals higher thermal stability of coatings obtained at 95°C. A scratch tester at constant (6 N) and progressive load (5-24 N) was used to estimate the coatings scratch hardness and adhesion. The corrosion behaviour of ENB coatings in 3.5 % NaCl was studied using potentiodynamic polarization tests. The Ni-B coated specimens could efficiently provide barrier protection to steel substrate. But the corrosion potential was lower compared to lead stabilized bath.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of Ni-B electroless coating from stabilizer free bath and characterization of high temperature tribological behaviour, scratch and corrosion resistance

Agrawal¹,

Mukhopadhyay²

2022

Surf. Topogr.: Metrol. Prop.

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“…Nickel chloride (NiCl) and nickel sulphate (NiSO 4 ) are utilized as metal ion bases in an electroless nickel solution. NaPO 2 H 2 and NaBH 4 are used to generate Ni-P and Ni-B coatings, respectively, depending on the type of coating required [ 5 , 6 ]. To escape the breakdown of the electroless bath and to control the reactions, organic salts are utilized as complexing agents.…”

Section: Coating Formation Mechanismmentioning

confidence: 99%

“…In a typical process, sodium hypophosphite (NaPO 2 H 2 ) is extensively operated as a reducing agent. In some cases, sodium borohydride (NaBH 4 ) and dimethylamine borane might be used instead of NaPO 2 H 2 [ 5 , 6 ]. The main advantages of electroless coating are the inexpensiveness and thickness uniformity of the deposit over complex geometries.…”

Section: Introductionmentioning

confidence: 99%

Advancements in Nickel-Phosphate/Boron Based Electroless Composite Coatings: A Comprehensive Review of Mechanical Properties and Recent Developments

Chintada,

Gurugubelli,

Tamtam

et al. 2023

Materials

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Nickel-Phosphate/Boron (Ni-P/B) electroless coatings have been widely used to improve physical and mechanical properties in various industrial applications, including the automotive, aerospace, chemical processing, food, oil and gas, electronic, textile, and printing industries. Electroless nickel coatings are one of the most popular surface-coating methods due to their low cost and short processing time. The purpose of this review is to look at several coating materials and the existing processes for making electroless coatings on different materials. The improvement of Ni-P/B composite coatings by the incorporation of secondary particles into an alloy matrix at the macro, micro, and nano levels is explained in detail. Process parameters like type of surfactant, annealing temperature, size of the reinforcement material, and reducing-agent percentage on mechanical characteristics like hardness, high-temperature oxidation behaviour, friction, coefficient, wear, and corrosion have been broadly researched and illustrated clearly.

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The impact of surfactants on the properties of electroless Ni–P–SiC coatings

Chintada¹,

Gurugubelli²,

Koutavarapu

2022

Materials Chemistry and Physics

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An investigation over the effect of the reducing agent on the properties of the ZnO-reinforced Ni–P coatings

Cited by 3 publications

References 32 publications

Development of Ni-B electroless coating from stabilizer free bath and characterization of high temperature tribological behaviour, scratch and corrosion resistance

Development of Ni-B electroless coating from stabilizer free bath and characterization of high temperature tribological behaviour, scratch and corrosion resistance

Advancements in Nickel-Phosphate/Boron Based Electroless Composite Coatings: A Comprehensive Review of Mechanical Properties and Recent Developments

The impact of surfactants on the properties of electroless Ni–P–SiC coatings

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