The tin stabilization effect on the microstructure, corrosion and wear resistance of electroless NiB coatings

Bonin, Luiza; Vitry, Véronique; Delaunois, Fabienne

doi:10.1016/j.surfcoat.2018.10.011

Cited by 41 publications

(32 citation statements)

References 43 publications

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“…In the case of elements with significant stabilization properties, the deposition should completely stop (plating rate equals to zero) for high stabilizer concentrations. On the other hand, elements that never stop the deposition are considered as not having any stabilizing properties [15].…”

Section: Bath Stabilitymentioning

confidence: 99%

Replacement of Lead stabilizer in electroless Nickel-Boron baths: Synthesis and characterization of coatings from bismuth stabilized bath

Bonin

Vitry

Delaunois

2020

Sustainable Materials and Technologies

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Only a few compounds have been completely characterized as stabilizers in alkaline electroless nickel-boron plating and most of them have serious impact on health or the environment. In this paper, the effects of bismuth salts on the bath stability and characteristics of electroless NiB deposits obtained from an alkaline electroless nickel bath reduced by borohydride are presented. The objective of this paper is to propose a healthy and environmental friendly electroless NiB coating. The process of production was maintained the same as traditional NiB to facilitate the industrial adaptation. Bismuth accelerates the rate of deposition up to 10 −5 mol/L and inhibits plating from a concentration of 0.01 mol/L. The bismuth ions in the NiB bath act as stabilizer but some bismuth also co-deposits with the nickel-boron coating, leading to a coating with 3 wt% bismuth. The coating presents a homogeneous surface morphology with a 15.11 μm/h plating rate in agitated and non-replenished bath. The X-ray diffraction patterns of electroless NiB coatings stabilized by Bi 3+ exhibit a single broad peak, indicating a strong tendency to form amorphous structure. The coatings present the typical high hardness of NiB coatings (830 hv 50), with a relatively smooth surface. The wear behavior was characterized by ball-on-disc tests and a friction coefficient of 0.45 is obtained after 100 m of test with 5 N charge and an alumina ball. Scratch test results show the first damage after 16 N. NiB-Bi coatings have impressive properties and can replace lead stabilized electroless NiB in different fields.

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Section: Bath Stabilitymentioning

confidence: 99%

Replacement of Lead stabilizer in electroless Nickel-Boron baths: Synthesis and characterization of coatings from bismuth stabilized bath

Bonin

Vitry

Delaunois

2020

Sustainable Materials and Technologies

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“…For Coatings 2021, 11, 576 2 of 15 this purpose, many compounds, mainly heavy metals, have been used as stabilizers for the electroless nickel-boron deposit process. Lead and thallium have primarily been used as standard stabilizers for 30 years in the industry of electroless nickel-boron deposit [15]. However, the emergence of new legislation dictates the limitation in using Pb [16] and Tl in the EN deposition baths [17].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Electroless Nickel–Boron Deposit from Optimized Stabilizer-Free Bath

et al. 2021

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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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“…Besides heat/thermo-chemical treatment or nitriding, recent studies have revealed that an inclusion of a third or fourth element to form poly-alloys enhances the properties of the coatings. 16–24 The inclusion of tungsten resulted in the formation of the Ni–B–W coating, 16,17 while the inclusion of molybdenum resulted in the deposition of the Ni–B–Mo coating. 18,19 A significantly higher microhardness of Ni–B–W coatings were observed compared to the binary alloy.…”

Section: Introductionmentioning

confidence: 99%

“…20 Consequently, Ni–B–W coatings possess higher resistance to deformation and wear. Other poly-alloy coatings with high hardness and wear resistance include Ni–B–Sn 22,23 and Ni–B–Bi coating. 24 Furthermore, Ni–B–Sn or Ni–B–Bi coatings were deposited from a more eco-friendly SnCl 2 /bismuth stabilized bath instead of conventional lead-based stabilizer.…”

Section: Introductionmentioning

confidence: 99%

Co-deposition of W and Mo in electroless Ni–B coating and its effect on the surface morphology, structure, and tribological behavior

Mukhopadhyay

Barman

Sahoo

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The Ni–B binary alloy deposited by autocatalytic chemical deposition technique has tremendous potential of wear/friction reduction and wide industrial usage. A significant improvement in mechanical properties, higher hardness, and wear resistance can be achieved in electroless nickel coatings by deposition of poly-alloy coatings rather than the binary variant. The present work therefore investigates the outcome of co-deposition of both tungsten and molybdenum in binary Ni–B coatings on the morphology, structure, and tribological behavior. Ni–B–W–Mo poly-alloy coatings were deposited by chemical reduction on AISI 1040 steel. Ni–B–W and Ni–B–Mo ternary coatings were also deposited along with Ni–B for effective comparison. Tribo-tests in the as-deposited and heat-treated condition (400°C for 1 h) revealed that the anti-wear properties of Ni–B–W and anti-friction properties of Ni–B–Mo could be realized in Ni–B–W–Mo coatings. Also, Ni–B–W–Mo coatings were observed to have high W content and a compact defect-free surface morphology with dense nodules. Backscattered electron images of the worn surface of the Ni–B–W–Mo coating in the as-deposited and heat-treated condition revealed low deformation of the coating with mild abrasion and an excellent overall tribo-performance.

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The tin stabilization effect on the microstructure, corrosion and wear resistance of electroless NiB coatings

Cited by 41 publications

References 43 publications

Replacement of Lead stabilizer in electroless Nickel-Boron baths: Synthesis and characterization of coatings from bismuth stabilized bath

Replacement of Lead stabilizer in electroless Nickel-Boron baths: Synthesis and characterization of coatings from bismuth stabilized bath

Characterization of Electroless Nickel–Boron Deposit from Optimized Stabilizer-Free Bath

Co-deposition of W and Mo in electroless Ni–B coating and its effect on the surface morphology, structure, and tribological behavior

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