Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Investigating the effect of sodium dodecyl sulfate on microhardness changes of nickel-alumina composite coatings and pure nickel coatings

Document Type : Original Article

Authors
Sadegh Mirzamohammadi
Seyed Mohammad Jesmani
Abbas Abbasian
Department of Materials and Metallurgical Engineering, National University of Skills (NUS), Tehran, Iran
10.22034/ijme.2025.478764.2008
Abstract
Fabrication of practical composite coatings by electroplating method requires obtaining suitable methods to increase their micro hardness. Based on this, the aim of this research was to investigate and compare the effect of sodium dodecyl sulfate (SDS) on composite plating and micro hardness properties of nickel-alumina composite coatings and pure nickel coatings. The Watt bath was determined as the electrolyte of the electroplating bath. The combination of Sodium dodecyl sulfate with different concentrations of 50 mg/l to 300 mg/l was used as an additive for the Watt’s bath. Increasing the concentration of SDS in the bath up to 200mg/l caused an increase in the content of particles from 1.8 to 5% by weight. The micro hardness of nickel and pure nickel composite coatings was evaluated by a Vickers micro hardness tester. Changing the concentration of SDS from 50mg/l to 150mg/l due to the increase in the content of reinforcement particles in the coating caused an increase in micro hardness from 260Hv to 510Hv. Increasing the concentration of SDS from 150mg/l to 200mg/l caused a decrease in micro hardness from 510Hv to 460Hv despite the increase in the content of reinforcement particles in the coating. Increasing SDS from 150mg/l to 200mg/l caused an 11% decrease in the micro hardness of the pure nickel coating. Because, excessive increase of this additive causes the formation of carbonaceous materials and embrittlement of the nickel substrate. Based on the obtained results, it can be concluded that the optimal value of SDS concentration in the water bath to improve the micro hardness of nickel-alumina composite coatings is between 100mg/l and 150mg/l.
Keywords
Nickel
Composite Coating
Electroplating
Sodium Dodecyl Sulfate
Microhardness
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