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Testeur de corrosion cyclique CASS avec ASTM B368

The DERUI DR-H304-6 CASS corrosion test chamber supports copper-accelerated acetic acid salt spray evaluation for decorative nickel-chromium, copper-nickel-chromium and suitable anodized aluminum coating systems. Configure cabinet size and test modes around ASTM B368 or ISO 9227 CASS requirements.

Modèle : DR-H304-6
Test method: Copper-accelerated acetic acid salt spray (CASS)
Normes : ASTM B368 and ISO 9227 CASS
Applications : Decorative plating, coated aluminum and electroplating process control
Configuration: Confirm working volume, specimen holders, supported test modes and utilities before ordering
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Copper-Accelerated Acetic Acid Salt Spray

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.

Primary methodsASTM B368 and ISO 9227 CASS
Typical specimensDecorative plated parts and coated aluminum
Before quotationConfirm cabinet size, test modes and utilities

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.

Important : CASS is not automatically a wet/dry cyclic corrosion method. ASTM B368 and ISO 9227 CASS use controlled salt fog. SAE J2334, ASTM G85 and OEM cyclic-corrosion programs require additional humidity, drying, temperature-transition or solution-delivery capabilities. Specify those methods separately.

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
AASS
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Acidified sodium-chloride solution Decorative Cu/Ni/Cr or Ni/Cr coatings and some anodic or organic coatings on aluminum
CASS
Copper-accelerated AASS
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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Utilités Site voltage/frequency, compressed air quality, water supply, exhaust and drainage
Sécurité Solution handling, door interlock, low-liquid protection, over-temperature alarm and emergency response

Typical applications

Automotive decorative trimEvaluate plated grilles, handles, bezels and exterior decorative components against the applicable OEM specification.
Sanitary and hardware fittingsCheck decorative nickel/chromium systems used on faucets, bathroom hardware and consumer fittings.
Anodized aluminumAssess suitable anodic and organic coating systems where ASTM B368 or ISO 9227 CASS is specified.
Electroplating process controlDetect changes associated with coating thickness, porosity, pretreatment or bath-process variation.
Supplier qualificationCompare production lots against a defined coating specification and agreed acceptance method.
Research and developmentStudy coating-system changes using controls and replicates without claiming direct service-life prediction.

From test specification to defensible result

  1. Identify the governing document.
    Record the exact standard edition, product specification, exposure duration and evaluation method.
  2. Verify chamber capability.
    Confirm CASS chemistry compatibility, cabinet controls, collection system and required utilities.
  3. Prepare specimens consistently.
    Clean, mask and mount parts only as required by the applicable specification.
  4. Verify solution and fog.
    Record reagent preparation, pH, temperature, collection rate and cabinet-corrosivity checks.
  5. Control interruptions.
    Document door openings, replenishment, alarms and any deviation that could affect results.
  6. 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?

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1. Q : Qu'est-ce qu'un Testeur de Corrosion Cyclique CASS ?
R : Un testeur de corrosion cyclique CASS (Salt Spray à l'acide acétique accéléré par cuivre) est une chambre d'essai environnementale avancée qui simule des conditions de corrosion agressives par une exposition cyclique à un brouillard salin acide enrichi en cuivre, des phases de séchage et d'humidité. Il est principalement utilisé pour évaluer la durabilité des revêtements décoratifs, des garnitures automobiles et des revêtements haute performance plus rapidement que les tests de brouillard salin traditionnels.

2. Q : En quoi le test CASS diffère-t-il d'un test de brouillard salin standard (ASTM B117) ?
R : Contrairement au brouillard salin neutre continu dans ASTM B117, le test CASS ajoute de l'acide acétique et du chlorure de cuivre à la solution et introduit des phases cycliques d'humidité/sec/dry. Cela accélère la corrosion et reproduit mieux le stress environnemental réel, ce qui le rend plus adapté pour tester le nickel-chrome décoratif et les alliages d'aluminium.

3. Q : Quelles normes un testeur de corrosion cyclique CASS respecte-t-il ?
R : Il respecte les normes internationales telles que ASTM B368ISO 9227 (méthode CASS)DIN 50021, et des protocoles spécifiques à l'industrie comme SAE J2334. De nombreuses spécifications automobiles (GMW, VW) et aérospatiales font également référence aux tests CASS pour la validation des composants.

4. Q : Quels matériaux ou produits sont couramment testés avec un testeur CASS ?
R : Les applications typiques incluent :

  • Revêtements décoratifs en cuivre-nickel-chrome (par exemple, grilles automobiles, accessoires de salle de bain)

  • Surfaces en alliage d'aluminium

  • Zinc moulé sous pression

  • Garnitures extérieures automobiles et boîtiers électroniques

  • Fixations et connecteurs revêtus

5. Q : Combien de temps dure un cycle de test CASS typique ?
R : La durée du cycle varie selon la spécification, mais les programmes de test courants vont de 24 à plus de 480 heures. Par exemple, le placage décoratif automobile peut nécessiter 96 à 240 heures d'exposition cyclique pour répondre aux normes de durabilité des OEM.

6. Q : Quelles caractéristiques clés dois-je rechercher dans un testeur de corrosion cyclique CASS ?
R : Prioriser :

  • Contrôle précis de la température, de l'humidité et des cycles de pulvérisation/sec

  • Construction de la chambre résistante à la corrosion (acier inoxydable ou PP)

  • Programmation cyclique automatisée et enregistrement des données

  • Surveillance en temps réel du pH, du taux de collecte de brouillard et de la concentration en ions cuivre

  • Certificats d'étalonnage de conformité (par exemple, ISO 17025)

7. Q : Un testeur CASS peut-il également effectuer des tests de brouillard salin standard (NSS) et de brouillard salin acétique (AASS) ?
R : Oui, la plupart des testeurs CASS avancés sont multifonctionnels et peuvent être configurés pour effectuer Brouillard salin neutre (NSS)Brouillard salin acétique (AASS), et des profils de corrosion cyclique en ajustant la solution de test et les paramètres du cycle — offrant une flexibilité pour diverses exigences de laboratoire.

8. Q : Comment entretenir un testeur de corrosion cyclique CASS pour obtenir des résultats précis ?
R : L'entretien essentiel comprend :

  • Nettoyage régulier des buses et des lignes de solution salée pour éviter les obstructions

  • Surveillance et réapprovisionnement des niveaux de chlorure de cuivre et d'acide acétique

  • Calibrer les capteurs (température, pH, taux de brouillard) annuellement

  • Inspecter les joints et les éléments chauffants pour assurer l'intégrité de la chambre

9. Q : Pourquoi le cuivre est-il ajouté à la solution de test CASS ?
R : Le chlorure de cuivre accélère le processus de corrosion en catalysant les réactions d'oxydation, en particulier sur les couches de nickel et de chrome. Cela permet de rendre visibles beaucoup plus rapidement les défauts dans les revêtements décoratifs ou protecteurs.

10. Q : Comment choisir entre un testeur CASS et une chambre de brouillard salin plus simple ?
R : Choisissez un Testeur de corrosion cyclique CASS si vous avez besoin de :

  • Tester des revêtements décoratifs ou de haute valeur dans des conditions cycliques réalistes

  • Répondre aux spécifications de l'automobile, de l'aérospatiale ou des biens de consommation haut de gamme

  • Accélérer la découverte de la corrosion pour la R&D ou la validation de la qualité
    Optez pour un chambre de brouillard salin basique si vous ne nécessitez qu'un test d'exposition constante pour le dépistage général des matériaux ou la conformité à des normes plus simples comme ASTM B117.

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