ptc1

PTC1™ Paint Test Cell

The PTC1™ Paint Test Cell is a low-cost sample cell for electrochemical testing of coated samples.  The PTC1™ can also be used to test bare metal samples using PortHoles™ Electrochemical Sample Masks. 

Product Details

Overview

The design of the PTC1™ Part No. 990-197) is very simple in order to keep cost down, since most users will require many cells for testing. The flat sample under test is clamped between a glass tube with an O-ring seal and the Teflon base. The tube is partly filled (20-50 mL) with the test electrolyte and sealed with a rubber stopper. A reference electrode (possibly Saturated Calomel) and a graphite rod counter electrode are mounted through the stopper.

For users concerned about graphite particles from the counter electrode contaminating the solution, then use the Counter Electrode Bridge Tube (990-194) with a Platinum wire counter electrode. The platinum counter electrode is isolated from the sample electrolyte by a glass frit.

Recommended Uses

Paints and Coatings

The PTC1™ is perfect for testing of painted metal specimens using Electrochemical Impedance Spectroscopy. The exposed area of almost 15 cm2 is sufficiently large to incorporate a statistically significant number of defects in the coating. The large area is also a positive attribute from the data acquisition standpoint, since high impedance samples such as coatings are characterized by low current densities.

The PTC1™’s low cost becomes important for this application since high sample throughput and long-term exposure may require many cells setup at any given time. This type of testing is made most cost effective when combined with a multiplexer.

Corrosion Testing

The PTC1™ can also serve as a low cost flat cell for corrosion testing. It does not possess the larger volume necessary for longer tests or faster corroding materials, but for running a quick open circuit and polarization resistance test it can serve quite well. It will also work well for very low corrosion rate measurements since the exposed area can be large. For most corrosion testing of flat specimens, however, consider a ParaCell™ or, if crevice corrosion is a major problem, a FlexCell™.

Specifications

METAL SPECIMEN

Disk Shape Diameter at least 70 mm
Square Shape at least 60 mm on a side
Thickness  1- 10 mm
   

VESSEL DIMENSIONS

Volume 20 ml ( minimum volume ); 50 ml ( maximum volume )
Inner Diameter 30 mm
   

TEMPERATURE RANGE

Operating  -25ºC to 140ºC
   

CHEMICAL COMPATIBILITY

Materials Pyrex™, Teflon™, Viton™, silicone rubber

 

Replacement O-Rings for PTC1
Replacement O-Rings can be purchased from Kontes. The Part Number is 758292-0223. The dimensions of the O-Ring are: i.d. 40.87 mm, cross-section 3.53 mm.

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