Flat Electrochemical Corrosion Test Cell (250 mL), CFECTC

A Flat Electrochemical Corrosion Test Cell is a specialized reactor designed for testing flat specimens—such as sheet metal, coated plates, or thin films—without the need for complex machining. By clamping the sample against an O-ring, it defines a precise active surface area, which is critical for calculating corrosion rates (mm/year) and current density (mA/cm2). Unlike standard immersion cells, the flat cell protects the edges of the sample, preventing "edge effects" where corrosion often starts prematurely on cut surfaces.

The cell typically features a vertical or horizontal "barrel" design made of inert materials. (1) Sample (Working Electrode): A flat metal sheet or coupon. It is pressed against the cell body via a heavy-duty mechanical clamp. (2) Aperture & O-ring: This is the most critical part. The O-ring creates a liquid-tight seal that exposes only a known area (typically 1 cm2 or 10 cm2) to the electrolyte. (3) Current Collector Plate: A conductive plate (often Copper or Stainless Steel) sits behind the sample to provide electrical contact to the potentiostat. (4) Reference & Counter Electrodes: The Reference Electrode is usually placed in a Luggin Capillary that terminates near the sample surface to minimize voltage drops. The Counter Electrode (often a Platinum mesh or Graphite rod) is positioned parallel to the sample to ensure a uniform current field.