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Corrosion testing

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Definition: Corrosion testing is the experimental investigation of the resistance of a material or coating system to corrosive media. The aim is the quantitative or qualitative assessment of corrosion behaviour under defined conditions. Test methods are governed by standards, for example in DIN EN ISO 9227.

Practical relevance: Corrosion tests include salt spray tests, climatic tests, immersion tests or electrochemical measurements. The corrosion rate, mass loss, pitting corrosion or undercutting of coatings are assessed. The results serve material selection, qualification of coatings and service life estimation.

Decision-making perspectives:

  • Technical decision-makers: Selection of suitable material or coating systems for defined media.
  • Purchasing/project management: Definition of binding test requirements and acceptance criteria.
  • Science: Investigation of corrosion kinetics and comparison of accelerated test methods with field exposure.
  • Insurance/law: Demonstration of resistance or root cause determination in the event of corrosion damage.

Typical testing or verification methods: Salt spray test (DIN EN ISO 9227), condensation cyclic climate, electrochemical polarisation measurement, long-term exposure.

FAQ:

  • Does the salt spray test replace real operating conditions?
  • No, it is an accelerated comparative method and reflects real operating conditions only to a limited extent.
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