Electrochemical measurements in flowing solutions

Development of a microfluidic setup to study the corrosion product deposition in accelerated flow regions

“…Activation of the flow cell caused acceleration of simulated PWR coolant through the micro-orifice, and oxide deposition was observed. The oxide was consistent with CRUD deposits found under PWR conditions as described in the literature 26 and from plant data; 34 the morphology of the CRUD comprised both crystalline and particulate material, the majority of which was found adjacent to the orifice edge, and was determined to be Fe 3 O 4 .…”

Study of Erosion-Corrosion of Stainless Steel, Brass and Aluminum by Open Circuit Potential Measurements

“…Reynolds number is 500000 for flow velocity of 3.95 m/s for the same system. This value indicates that the flow is turbulent since the critical value for laminar to turbulent flow in a impinging jet system is 2000 4 . Turbulent flow near the surface enhanced oxygen mass transfer rate to the electrode surface and reduced the thickness of the diffusion boundary layer.…”

“…Electrochemical measurements in flowing solution can provide data on (a) the rate of general corrosion and the possibility of other forms of attack, (b) mechanism, (c) the characteristics hydrodynamic parameters, and (d) the composition of the solution by electro-analytically monitoring compositions or measuring red-ox potential, pH etc. 4 Open circuit potential (OCP) is the electrode potential at which no net current flow through the external circuit of the electrochemical cell. OCP of a corroding metal/alloy is measured as voltage between the metal/alloy (working electrode) and a reference electrode using a highimpedance voltmeter.…”

Flow-Assisted Corrosion in Coal Seam Gas Infrastructure

“…Similarly, Zheng, Che, and Liu (2008) state that a higher mass transfer coefficient results in an increase in corrosion rate. Poulson (1983) claims that even corrosion rates controlled by diffusion are not always linked to mass transfer, particularly in non-linear flow conditions. Kondo et al (2011) investigated FAC and erosion-corrosion of reduced activation ferritic/martensitic (RAFM) steel in liquid breeders and revealed that the corrosion rate in a flowing condition is twice that of static conditions.…”

“…al (Wu, et al, 2004) and Nesic (Nesic, 2012) both agree that turbulent flow which occurs at high velocity accelerates mass transfer of corrosion products from the metal surface, thereby preventing protective film formation. A higher mass transfer coefficient (MTC) increases corrosion rate (Zheng, et al, 2008), however, Poulson (Poulson, 1983) argues that even corrosion rates controlled by diffusion are not always linked to mass transfer, particularly in non-linear flow conditions. Surface morphology is also a critical factor that strongly affects the corrosion rate of carbon steel due to the change of electrochemical kinetics between the environment and the metal surface.…”