Electrochemical corrosion behavior of pulse and DC electrodeposited Co–P coatings

Wear and corrosion resistance of Co–P coatings: the effects of current modes

“…The PRC Co-P coating shows an amorphous structure due to the higher phosphorous content. 7 The average crystallite size of DC Co-P coating and PC Co-P coating evaluated from Debye-Scherrer equation are 24.6 and 15.7 nm, respectively. The renement of grains could be attributed to the improvement of current distribution and mass transfer under PC condition.…”

“…It was reported that Co-P coatings with high P content and amorphous structure exhibit excellent corrosion resistance. 6,7 There are many factors that affect the P content and phase structures of Co-P coatings, such as electrical parameters (current modes and current density), plating bath composition (P source concentration, additive type and pH value) and bath temperature. Among these variables, current mode is a exible and efficient variable to modify the P content and phase structures of alloy coatings.…”

“…Among these variables, current mode is a exible and efficient variable to modify the P content and phase structures of alloy coatings. Ezhilselvi et al 1,7 demonstrated that the Co-P coatings deposited by PC method have better corrosion resistance than those by DC method. Pulse current (PC) and pulse reverse current (PRC) are the two most common types of pulsed method.…”

“…Pulse current (PC) and pulse reverse current (PRC) are the two most common types of pulsed method. In spite of the deposition of Co-P by DC and PC methods has been extensively studied, [1][2][3]7 however, to the best of our knowledge, rarely attention has been paid to the deposition of Co-P alloy coating by PRC method. It was reported that alloy coatings deposited by PRC method exhibits higher corrosion resistance and wear resistance than that deposited by PC methods.…”

Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

“…However, the effect of alloying non‐metal like phosphorous to improve the properties of cobalt‐based alloys is a topic of recurring interest. Codeposition of phosphorous with cobalt from various bath conditions using different plating techniques has also gained equal attention owing to its improved microhardness, magnetic properties, thermal stability and high corrosion resistance of the coatings . In most of these above mentioned studies, individual effects of P codeposition and W codeposition with cobalt and their properties have been investigated.…”