Improved corrosion resistance through microstructural modifications induced by codepositing SiC-particles with electrolytic nickel

The chemical resistance of nano-sized SiC rich composite coating

“…The presented results can be explained based on the ideas reported previously [12][13][14]20]. First of all SiC in any form and size is highly inert and its presence reduces the effective area of the vulnerable metallic regions, thus the presence of SiC considerably reduces the etching rate.…”

“…been shown that not only the SiC layer but composite layer containing SiC particles can be also used to improve the chemical resistance of a coating layer; improved corrosion resistance was found by introducing SiC-particles to electrolytic nickel layer [12,13]. It has been also shown that the corrosion resistance of Ni-Co/SiC nano composite coatings depends on the size of SiC particles; it was much better if SiC nano particles were used than in case if the composite contained micro sized SiC [14].…”

“…On the other hand these layers are far from being perfect SiC. Rather, they are layers containing most likely defective amorphous SiC together with other components like C, Si and Ga. Based on the literature [12][13][14] one might hope that even such layers have high (compared to "usual" materials) resistance against chemical attack. Thus, we have studied the chemical resistance of these layers as a function of their thickness.…”

Electrodeposition of Composite Coatings of Cu/AlO(OH) Using Allyl Alcohol as an Additive

“…Additionally, it was verified that the use of continuous (DC) or pulsed 16 current influenced on the anticorrosive performance of composite coatings 22 . Another usually studied parameter concerning the co-deposition of composite coatings is the stirring speed of the electrolytic bath 3,9,23,24 . For example, this parameter affected the amount of CeO 2 particles (size between 15 and 20 nm) in a nickel matrix composite coatings, which increased the hardness of the produced coatings 3 .…”

“…For example, this parameter affected the amount of CeO 2 particles (size between 15 and 20 nm) in a nickel matrix composite coatings, which increased the hardness of the produced coatings 3 . The process of producing composite films is more complex than that used in the electrodeposition of alloys, since the particles of ceramic material to be embedded in the metallic matrix should be kept in suspension during the deposition process 7,20,24 . This feature requires that the electro co-deposition process should always occur under stirred conditions to prevent the precipitation of the particles 1,3,7,23 .…”