Scanning Electrochemical Microscopy (SECM) Investigation of 3D Printed Parts Produced by CMT Welding Technology

Abstract

In the field of manufacturing technology an exciting revolution is in progress today. The different methods of the so called additive manufacturing (AM) technologies are under fast developments. Several versions of them are called 3D printing. Less interest has been given to study the corrosion resistance character of the differently made 3D printed metal alloy items. In this work corrosion behaviour of 3D printed AlMg4.5Mn0.7 alloy samples were investigated. Conventional methods like open circuit potential measurements, Tafel plots taking and scanning electrochemical microscopy (SECM) – with pH measuring tungsten micro‐tip and micro‐disc type Pt electrode were used. The metal samples were embedded in epoxy resin. 2D SECM images and line scans were made to see the local changes of oxygen concentration. Flame atomic absorption spectroscopy was used for measuring the metal composition of manufacturing wire and printed sample. The local activity of the surface spots were measured using approach curves recorded in case of ferrocene methanol mediator.

Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy

“…The feedback mode has been widely employed for positioning the UME prior to pH measurements [28,[35][36][37]43,48,[59][60][61][62][63][64]. There are two ways to accomplish this: one is using a single-electrode probe, whereas the other is using a dual-electrode probe.…”

“…The only requirement is that the probe be able to perform both amperometric and potentiometric measurements. Examples of using a single-electrode probe include UMEs made of Sb/SbOx [59], W/WOx [63], and Pt/IrOx [43]. In order to achieve dual function in this type of UME, the oxide film must be defective to allow the redox reaction to occur at the tip [43].…”

“…They observed that at the severe localized corrosion sites, there was lower pH, higher H 2 evolution, and lower O 2 consumption. More recently, additive manufacturing alloys have also been studied by means of tracking local pH changes [63,102]. Meiszterics et al [63] investigated and compared the corrosion performance of a 3D-printed AlMg 4.5 Mn 0.7 Al alloy and its conventional counterpart as a substrate plate.…”

Investigation of the regeneration of the passive surface oxide layer of TiAl6V4 alloy printed by WAAM technology using different electrochemical test methods

“…3D printing of titanium alloys is also at the forefront of interest, with a number of publications investigating this material in the context of various 3D printing technologies [3, 4]. Our research team has assembled a 3D printer from components that can be used to carry out wire and arc additive manufacturing technology (WAAM) experiments [5]. Among 3D printing technologies, WAAM technologies have several advantages over powder‐based processes.…”

3D Printing Temperature Tailors Electrical and Electrochemical Properties through Changing Inner Distribution of Graphite/Polymer

“…[ 36–38 ] The SECM allows the highly localized and destruction free in situ probing of the electrochemical activity of composite materials and 3D‐printed parts by scanning an ultra‐microelectrode (UME, per convention, are electrodes having at least one dimension, such as the radius of a disk or the width of a band smaller than 25 µm) [ 39 ] across the substrate. [ 40–42 ] Thus, SECM provides an ideal platform for investigating the filler/continuous phase distribution of carbon‐polymer composite material as it can clearly differentiate between conductive carbon and insulating polymer at resolution of 10 µm.…”