Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. I. Electrochemical and corrosion properties of composite electrolytic coatings

Medyukh, V. K.; Shvets, V. A.; Medyukh, R. M.; Talash, V. N.; Guslienko, Yu. A.; Medyukh, N. R.; Уварова, І. В.

doi:10.1007/s11106-010-9226-4

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“…As shown in [6], Ni-based electrolytic coatings with B and Ti additions separated from the substrate had good corrosion resistance in a 3% NaCl solution. In this study, the same coatings 100 µm in thickness were subjected to further diffusion annealing to modify the structure, decrease porosity and imperfection, and improve performances.…”

Section: Resultsmentioning

confidence: 83%

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Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. II. Corrosion resistance of thermally treated coatings

Medyukh

Shvets

Medyukh

et al. 2010

Powder Metall Met Ceram

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The paper examines the potential for increasing the corrosion resistance of composite electrolytic and galvanophoretic coatings under thermal treatment. The corrosion behavior of the coatings in a 3% NaCl solution is analyzed under various conditions of thermal treatment. It is established that thermal treatment of composite electrolytic Ni-B and Ni-Ti coatings has no effect on the corrosion resistance of the electrolytic coating itself or that placed on a substrate. At the same time, the galvanophoretic Ni-B-Mo 2 C coating shows high corrosion resistance after thermal treatment at 1100°C owing to the obliteration of porosity during liquid-phase sintering. INTRODUCTIONNickel and its alloys are metals with the greatest corrosion resistance and are widely used for producing electrolytic coatings. These coatings are protective and, hence, they are required to have perfect structure and contain no pores or cracks that can originate electrolytic pairs causing corrosion processes and rapidly propagating over the volume [1,2]. Improvement of the corrosion resistance of any coatings involves attempts to make them free of pores or contain minimum pores and lattice defects.There are various process options to obtain porousless coatings, for example, successive deposition of several layers and subsequent thermal treatment permitting a high-quality coating with perfect structure. Thermal treatment can often modify the structure and phase composition of the coating, especially when other metals or metalloids are coprecipitated with nickel, and lead to the formation of solid solutions, eutectics, and intermetallides.Deposition of composite electrolytic coatings (CECs) is a promising method of improving the mechanical properties of protective layers. However, note that the presence of a foreign phase in a continuous nickel coating can cause additional stresses that affect its integrity. This factor calls for additional research into the corrosion behavior of different materials with composite coatings, which would have the corrosion resistance of nickel combined with a potential for improvement of its mechanical characteristics.It was shown in [3] that the introduction of boron particles into the nickel matrix and subsequent thermal annealing result in coatings whose wear resistance compares well with that of solid electrolytic chromium. To produce galvanophoretic coatings, a porous phoretic layer based on various refractory compounds such as carbides, borides, and silicides is deposited onto a galvanic eutectic Me-B sublayer. Liquid-phase sintering of the phoretic layer occurs during thermal treatment of these multilayer coatings at the eutectic temperature and results in quite a dense deposit. Different functional properties can be imparted to the material through variation in the chemical nature of additions during electrophoresis [4,5].It was of interest to examine in greater detail the corrosion characteristics of a galvanic coating before and after thermal treatment and after deposition of a phoretic layer.The corrosion ...

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Section: Resultsmentioning

confidence: 83%

“…Nickel-based CECs with boron and titanium additions were produced using the procedure described in the previous paper [6].…”

Section: Methodsmentioning

confidence: 99%

Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. II. Corrosion resistance of thermally treated coatings

Medyukh

Shvets

Medyukh

et al. 2010

Powder Metall Met Ceram

Self Cite

View full text Add to dashboard Cite

show abstract

Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. I. Electrochemical and corrosion properties of composite electrolytic coatings

Cited by 1 publication

References 2 publications

Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. II. Corrosion resistance of thermally treated coatings

Electrochemical and corrosion properties of composite electrolytic and galvanic Ni-based coatings. II. Corrosion resistance of thermally treated coatings

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