ASTM B368 CASS Corrosion Test Chamber
Model DR-H304-6 is intended for accelerated evaluation of decorative copper-nickel-chromium, nickel-chromium and suitable anodized aluminum coating systems under controlled CASS salt-fog conditions.
What CASS testing reveals
CASS means copper-accelerated acetic acid salt spray. Copper chloride and acetic acid are added to the sodium-chloride solution to create an aggressive, acidic fog environment. The method is especially useful for exposing pores, discontinuities and weak areas in decorative electrodeposited coatings.
ASTM B368 was developed specifically for decorative nickel/chromium and copper/nickel/chromium coatings. ISO 9227 also defines CASS apparatus, reagents and operating procedures, including assessment of cabinet corrosivity. Neither standard establishes one universal exposure duration, specimen geometry or acceptance limit; those requirements must come from the product, coating or customer specification.
CASS, AASS and NSS: choose the specified method
| Method | Solution and environment | Common application |
|---|---|---|
| NSS Neutral salt spray |
Neutral sodium-chloride fog under the referenced method | Metals, metallic coatings, conversion coatings, anodic oxide coatings and organic coatings on metals |
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Acidified sodium-chloride solution | Decorative Cu/Ni/Cr or Ni/Cr coatings and some anodic or organic coatings on aluminum |
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Acidified sodium-chloride solution with copper chloride | Decorative Cu/Ni/Cr or Ni/Cr coatings; selected anodic and organic coatings on aluminum |
Do not describe the result as “four to eight times faster than NSS.” Acceleration varies by coating system and the methods can produce different corrosion mechanisms, so a fixed conversion factor is not technically defensible.
What a compliant CASS system must control
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|---|---|
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Typical applications
From test specification to defensible result
- Identify the governing document.
Record the exact standard edition, product specification, exposure duration and evaluation method. - Verify chamber capability.
Confirm CASS chemistry compatibility, cabinet controls, collection system and required utilities. - Prepare specimens consistently.
Clean, mask and mount parts only as required by the applicable specification. - Verify solution and fog.
Record reagent preparation, pH, temperature, collection rate and cabinet-corrosivity checks. - Control interruptions.
Document door openings, replenishment, alarms and any deviation that could affect results. - Evaluate to the product method.
Report defects, rating method and acceptance decision without converting chamber hours into service years.
Operation, maintenance and safety
Prevent contamination between test methods
Residual copper and acid can affect subsequent NSS or AASS work. If one cabinet will run several chemistries, obtain a documented cleaning and verification procedure and determine whether your laboratory quality system permits method sharing.
Maintain the fog path
Inspect nozzles, solution filters, collectors, saturator, compressed-air treatment and drains. Deposits or blocked components can change fog distribution even when the controller display appears normal.
Handle CASS solution responsibly
CASS solution is acidic and contains copper. Provide appropriate personal protective equipment, ventilation, spill controls and waste disposal based on the safety data sheets and local regulations. Do not discharge solution without an approved disposal process.
Frequently asked questions
What is the difference between CASS and ASTM B117?
ASTM B117 is an apparatus operating practice commonly associated with neutral salt fog. ASTM B368 specifically defines copper-accelerated acetic acid salt spray conditions for suitable decorative coating systems. The solution chemistry and operating temperature differ.
Is CASS the same as cyclic corrosion testing?
No. CASS is a copper-accelerated acidic salt-fog method. Some laboratories may use “cyclic” loosely, but true cyclic-corrosion methods can require alternating fog, humidity, drying and temperature stages. Confirm the exact method before configuring the chamber.
Which materials are appropriate for ASTM B368?
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Can one chamber run NSS, AASS and CASS?
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