For over 50 years, Q-PANEL test substrates have been recognized as the world standard for a consistent and uniform test surface for paints, plating, adhesives, sealants, rust inhibitors and other coatings. This consistency and uniformity is now available through Q-Lab’s CX-series corrosion test coupons.

Corrosion test coupons ensure repeatability and reproducibility when performing laboratory corrosion testing. They help a user independently monitor the test conditions in the chamber, by measuring the mass loss of the coupons as the test progresses. CX corrosion coupons are designed to meet the stringent requirements specified in modern corrosion test methods, such as GMW14872, GM9540P, SAE J2334, SAE J2721, ASTM B117, ISO 9227, and VDA-233-102.

All Q-PANEL CX-series corrosion coupons include Certificate of Analysis, come pre-cleaned and ready to use right out of the package. This allows the user to simply measure the panels and place them in the tester, saving time and effort. And best of all, CX corrosion coupons are often half the price of competitors’ coupons.


Why do Corrosion Testing?

The estimated direct cost of corrosion effects in the United States alone is estimated at almost $300 billion annually – for this reason, it is critical for manufacturers to understand their products’ resistance to corrosive environments.  Corrosion test standards are used widely to address this issue, but for this corrosion testing to be of value, laboratories need to verify their testing is reliable and reproducible.

What are Corrosion Coupons?

Corrosion coupons (also known as mass-loss coupons) are standardized thin steel panels that serve as reference specimens in corrosion testing.  They help a user verify the rate of corrosion in corrosion chambers and serve as independent test monitoring devices. Q-Lab’s CX-series of standard corrosion test coupons are ideally suited for this application – they are consistent, clean, convenient, and cost-effective. 

Surface inconsistencies, such as variations in steel roller condition, carbon dust impurity, rust caused by handling errors, and long storage times can affect the consistency of corrosion mass-loss. As a result, ordinary steel is unsuitable for many corrosion tests. Q-Lab’s CX-series steel corrosion coupons minimize metal variability as a source of bias in critical corrosion tests, due to three key factors:

  • volume metal purchasing from select mills
  • automated production on a high-speed line
  • rigorous inspection at several processing stages 

The Q-Lab CX corrosion coupon production process thoroughly cleans panels and removes any oil from the surface. Special handling assures all panels are completely clean when packaged.  Corrosion coupons are packed in plastic bags with vapor phase rust inhibitor, preserving the high degree of surface quality for a long shelf life. 


For your safety and ease of handling, all Q-PANEL corrosion coupons have deburred edges, and some versions have rounded edges (depending on the requirements of the appropriate standard). Corrosion coupons are supplied pre-cleaned – in fact, Q-Lab’s cleaning and packaging quality allow you to use CX corrosion coupons right out of the package, without compromising test consistency. 

Furthermore, CX corrosion coupons are tailored to meet the requirements of major national, international, and manufacturer corrosion test standards without any modification – just plug and play. 

Because of high volume production and Q-Lab’s decades-long history as the leader in standardized test substrates, CX corrosion coupons cost much less than you might expect – often half the pricing of competitors.  Purchasing pre-cleaned corrosion coupons reduces the time lab personnel must spend cleaning and handling panels, saving further costs.


Q-Lab offers three different steel Corrosion Coupons as standard items, typically in-stock. These three product offerings are designed specifically to meet the requirements of some of the most prevalent industry-standard test methods for evaluating corrosion. 


These corrosion coupons are made from SAE1008-1010 carbon steel, measuring 25 x 51 x 3 mm (1 × 2 × 0.125”).  They come standard with rounded corners and a Q-shaped center hole and plastic mounting hardware for convenience. CXB-12 coupons are designed for testing to important corrosion standards like GMW14872, GM9540P, and SAE J2334.


Q-Lab’s CXC-35 Corrosion Coupons are 76 x 127 x 0.8mm  (3 × 5 × 0.032″) panels made from SAE1008 commercial-grade, cold-rolled carbon steel. CXC-35 corrosion coupons meet all of the requirements of the ASTM B117 salt fog corrosion test standard.


Measuring 70 × 150 × 1.2 mm ( 2.76 × 5.90 × 0.047″) of CR-4 grade steel, CXD-2.76-5.90 corrosion coupons meet the test requirements set out in standards ISO 9227 and VDA-233-102.

Custom Panels
In addition to our standard corrosion coupons above, we can also make custom corrosion coupons in a variety of shapes, sizes, alloys, and finishes, not shown on our specification bulletin. Send us your custom specifications for a quote.



ASTM D2201

Standard Practice for Preparation of Zinc-Coated and Zinc-Alloy-Coated Steel Panels for Testing Paint and Related Coating Products

This practice covers the preparation of zinc-coated and zinc-alloy-coated sheet steel panels to be used for testing paint, varnish, lacquer, conversion coatings, and related products.



Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products

This practice covers various types of cold rolled steel panels and the procedures to be followed in their preparation for testing paint, varnish, lacquer, conversion coatings, and related products.



Standard Practice for Conducting Atmospheric Corrosion Tests on Metals

This practice covers and defines conditions for exposure of metals and alloys to the weather. It sets forth the general procedures that should be followed in any atmospheric test. It is presented as an aid in conducting atmospheric corrosion tests so that some of the pitfalls of such testing may be avoided. As such, it is concerned mainly with panel exposures to obtain data for comparison purposes.


Looking for a specific test standard? Search entire listing of all standards.