Abstract
It has been established that the presence of selenite ions at concentrations of 0.1 – 10 mg l -1 drastically increases (up to 30 – 35 times) the chemical dissolution rate of electrodeposited chromium coatings during cathodic polarization in sulphuric acid media (up to pH 3). The process can be triggered by a short cathodic pulse and dissolution proceeds spontaneously after the pulse at an ever-increasing rate until the chromium coating is completely dissolved. The relationships between the rate of the process and some basic parameters (selenite ion concentration, pH and temperature of the corrosive medium) were determined. It is presumed that the effect exerted by the selenite ions is related to their participation in the cathodic process and their enhancement of the interaction between chromium atoms and hydrogen ions by forming intermediate Cr x Se-type compounds with pronounced metallic character and high electrical conductivity.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
