ISO 9227 do not provide any relation to test duration with life
Dear Dr. Ashwani Upadhyay,
it is very difficult correlating salt spray test hours and real life.
Some references indicate that approximately 100 hours salt spray is similar to one year outdoors based on OEM testing in the US. Similar data are indicated for Europe. That is the closest relation based on some papers. A 100 hours in the salt spray cabinet could be equivalent to a month exposure in the Panama Canal Zone but you need to know what environment you intend to compare it with. Obviously, 100 hours in the salt spray could also be 15 years in the desert.
Perhaps, it could more reasonable to correlate the behavior of different samples, subjected to a standardized corrosive "stress", following one of the different regulations (eg ASTM B117, ISO 9227, DIN 50 021, etc.). The next step could be a similar comparison with an exposure of the same samples in a real corrosive environment with an environmental data monitoring support.
Best regards, Pierluigi Traverso
Dear Dr. Ashwani Upadhyay,
it is very difficult correlating salt spray test hours and real life.
Some references indicate that approximately 100 hours salt spray is similar to one year outdoors based on OEM testing in the US. Similar data are indicated for Europe. That is the closest relation based on some papers. A 100 hours in the salt spray cabinet could be equivalent to a month exposure in the Panama Canal Zone but you need to know what environment you intend to compare it with. Obviously, 100 hours in the salt spray could also be 15 years in the desert.
Perhaps, it could more reasonable to correlate the behavior of different samples, subjected to a standardized corrosive "stress", following one of the different regulations (eg ASTM B117, ISO 9227, DIN 50 021, etc.). The next step could be a similar comparison with an exposure of the same samples in a real corrosive environment with an environmental data monitoring support.
Best regards, Pierluigi Traverso
Hi :)
The text of the introduction to standard 9227 explicitly states that the results should not be used to assess practical corrosion resistance.
Quote: "The test results should therefore not be considered as a direct indication of the corrosion resistance of the tested metallic materials in all environmental conditions in which these materials can be used." end Quote
Unless the test and duration is correlated with in service performance in the specific service environment you can't. Even with such a correlation many would remain sceptical of the claims. Salt spray is perhaps more useful for comparing the performance of different things (alloys, coatings or other surface treatments) in a standardized test.
Cheers
Graham Gedge
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