Abstract
By using the methods of XRD, SEM/EDS, electrochemical polarization, and a weight loss test, the effects of the rare earth salt CeCl3 on the adherence, hardness, porosity and corrosion resistance of an electroplated Pd-Ni film on 316L stainless steel were studied. The results showed that by adding 1.0 g L−1 CeCl3 in the plating bath, the obtained Pd-Ni film was obviously improved. The grain size was refined, and the microstructure was more compact and uniform. The film hardness and the adherence to the substrate increased, and the corrosion resistance in a 20 wt % H2SO4 solution (80 °C) obviously increased. Ce3+ increased the throwing power of the bath, which resulted in more uniform current distribution and strengthened the cathodic polarization degree during the electroplating process.
Highlights
The rare earths have been used in many fields such as electroplating, surface conversion coating, heat treatment, metal corrosion protection, and friction resistance, which makes them good prospects for applications [1,2,3,4,5,6] due to their unique electronic structures and chemical activity
In the electroplating process, adding a small amount of soluble rare earth salt in the plating bath can improve the properties of the coatings, such as some physical properties and corrosion resistance [1,3,4] In addition, a rare earth salt can improve the throwing power (T.P.) of the plating solution, reduce the grain size of the plating alloy, and make the microstructure of the coating more uniform [7,8,9]
Pd-Ni and Pd-Cu alloy coatings with good surface micro-hardness and adhesive strength were deposited on 316L stainless steel by electroplating, and these coatings showed very good corrosion resistance in a hot sulfuric acid solution and an acetic
Summary
The rare earths have been used in many fields such as electroplating, surface conversion coating, heat treatment, metal corrosion protection, and friction resistance, which makes them good prospects for applications [1,2,3,4,5,6] due to their unique electronic structures and chemical activity. The palladium film has excellent corrosion resistance, abrasive resistance, electrical conductivity, catalytic properties, hydrogen evolution performance, and a white appearance, all of which have led to its use as good hydrogen storage and catalytic materials It has been widely used in the electronics industry, in applications such as semiconductors and printed circuit boards, and the decorative industry [10,11]. In order to further improve the performance of Pd-Ni alloy coating and understand the effects of rare earth metals on the electroplating process of Pd-Ni, in this paper, different contents of CeCl3 were introduced in a Pd-Ni basic plating electrolyte; the throwing power of the rare earth on the plating solution was studied, and the main physical properties of the coating such as bonding strength, hardness, porosity, and corrosion resistance in a hot, diluted H2 SO4 solution were investigated by weight loss and polarization tests combined with the XRD and SEM/EDS methods
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