Help to visually identify a corrosion type

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SUMMARY

The discussion centers on identifying a corrosion type observed in automotive components during a controlled test at 85 degrees Celsius and 85% relative humidity. The corrosion affects both a large steel bracket and a small metal screw, leading to suspicions of a test setup issue, potentially due to contaminants. The water used in the humidity chamber is de-ionized with a resistance of 60 kohms/cm. Participants are encouraged to visually identify the corrosion type based on the provided details.

PREREQUISITES
  • Understanding of corrosion types and mechanisms
  • Familiarity with materials used in automotive components, specifically steel and plating
  • Knowledge of controlled environmental testing conditions
  • Basic chemistry principles related to corrosion and contaminants
NEXT STEPS
  • Research the effects of humidity on corrosion in automotive materials
  • Learn about different types of corrosion, including galvanic and pitting corrosion
  • Investigate the properties of de-ionized water and its impact on corrosion
  • Explore best practices for maintaining controlled test environments to prevent contamination
USEFUL FOR

Automotive engineers, product assurance professionals, and anyone involved in material testing and corrosion analysis will benefit from this discussion.

Molydood
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Hi all,

I work in the "product assurance" department for an automotive company, and we have encountered what looks to be a corrosion effect during a controlled test (85 degrees C and 85% relative humidity) on one of our components.

I feel that my limited knowledge of chemistry is really letting me down with this one (most of our failure mechanisms are mechanical or electrical)... I wonder if anybody can identify visually or with an intelligent guess, at the type of corrsosion this is (see attached picture?)

We have checked the humidity chamber and the water has been de-ionised and has a resistance of 60kohms/cm. It appears that both the large metal bracket and also the small metal screw have been effected, so we are suspecting a test setup issue (ie some contaminent is entering the chamber maybe diffusing off the surface of the bracket)

any help would be appreciated

Martin
 

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Is the bracket made out of zinc or aluminum?
Is the screw made of steel?
 
bracket is steel
screw - not sure, will go and check, but its probably plated
 

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