Influence of conditions of electrodeposition of nickel on the physico-chemical and corrosion properties of the coatings
Galvanic coating of steel products is one of the main methods of corrosion protection, and nickel is one of the most common metals used in the process. Nickel-based electrochemical coatings are widely used as corrosion-resistant and protective coatings.
This study focuses on the investigation of formation of nickel-based galvanic coatings under various conditions: at different temperatures, current densities, and using various mixing methods. The coatings were produced by the process of galvanostatic deposition using Watts nickel electrolyte. The effects of the conditions of electrodeposition process on the characteristics and the corrosion resistivity of the resulting coatings were studied. By using optical microscopy, a relation between the electrolysis conditions and the surface morphology or the size of the growing nickel crystals was discovered. It was established that increase of current density increases the microhardness of the coatings, due to the formation of coarse-grained nickel deposits. Highest corrosion resistivity is achieved by creating finely-grained nickel coatings, which are formed under low current density, low temperature and with mechanical mixing.
The optimal conditions for producing high quality nickel coatings were established as follows: current density of 25 mA/cm2, temperature 20 oC, and using mechanical stirring. The nickel coatings, deposited under these conditions, have a high quality and the process of electrodeposition of nickel characterized by a high current efficiency.
1 Damaskin BB, Petriy OA (1983) Introduction into Electrochemical Kinetics [Vvedenie v Elektrohimicheskuyu kinetiku]. High School [Vysshaya shkola], Moscow, Russia. (In Russian)
2 Bagockij VS (1988) Basics of Electrochemistry [Osnovy Elektrohimii]. Chemistry [Himiya], Moscow, Russia. (In Russian)
3 Whitehead AH, Simunkova H, Lammel P, Wosik J, Zhang N, Gollas B (2011) Wear 270:695-702. http://dx.doi.org/10.1016/j.wear.2011.02.00
4 Zarghami V, Ghorbani M (2014) J Alloy Compd 598:236–242. http://dx.doi.org/10.1016/j.jallcom.2014.01.220
5 Srivastava M, Balaraju JN, Ravishankar B, Rajama KS (2010) Surf Coat Tech 205:66-75. http://dx.doi.org/10.1016/j.surfcoat.2010.06.004
6 Abdel Hamid Z, Ghayad IM (2002) Mater Lett 53:238-243. http://dx.doi.org/10.1016/S0167-577X(01)00484-0
7 Kim SK, Oh TS (2011) T Nonferr Metal Soc 21:68-72. DOI: http://dx.doi.org/10.1016/S1003-6326(11)61063-7
8 Xu X, Liu H, Li W, Zhu L (2011) Mater Lett 65:698-701. http://dx.doi.org/10.1016/j.matlet.2010.11.024
9 Liu X, Zhang H, Wang J, Wang Z, Wang S (2012) Surf Coat Tech 206:4976-4980. http://dx.doi.org/10.1016/j.surfcoat.2012.05.133
10 Xu X, Zhu L, Li W, Liu H (2011) Appl Surf Sci 257:5524-5528. http://dx.doi.org/10.1016/j.apsusc.2011.01.015
11 Benkoski JJ, Srinivasan R, Maranchi JP (2011) Self-healing coatings. US Patent US20110293958 A1.
12 Belen'kij MA, Ivanov AF (1985) Electrochemical Precipitation of Coatings [Elektroosazhdenie metallicheskih pokrytiy]. Metallurgy [Metallurgija], Moscow, Russia. (In Russian)
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License (CC BY-NC-ND 4.0) that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.