Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

A planar workpiece/planar segmented tool experimental configuration has been used to collect current-time data for the electrochemical machining (ECM) of Inconel 718 (In718) and stainless steel (SS316). As with previous measurements, theoretical analysis of the chronoamperometric data has been used to obtain values for the characteristic parameters of ECM under characteristic machining conditions, but the segmented tool allows this for each segment. These parameters are the valency, n, and k, from which the minimum voltage required to initiate machining, V0, and the electrolyte conductivity, k can be obtained. The variation of n, V0 and k between segments enables ECM conditions along the flow path length to be probed. Measurements on In718 in nitrate electrolyte have shown a small increase in electrolyte conductivity along the flow path. Tool segments which overlap the workpiece ends have been employed to measure edge effects in the ECM process; no significant edge effects were found when machining In718 in nitrate. The temporal and spatial dependences of a change in valency previously observed during the machining of SS316 have also been studied for the first time. Regions of low valency (n = 2.1) dissolution (downstream) and high valency (upstream, n = 3.0) dissolution were observed, with an intermediate region with monotonically decreasing valency where 3.0 > n > 2.1.

Original publication




Journal article


Journal of Applied Electrochemistry

Publication Date





1213 - 1220