Relevance of Salt Spray Test
Dealing with mineral oil based rust preventives I have often observed that the salt spray test are often not very reproducible. I also came to know that salt spray is no longer a requirement in many of the European and US auto manufacturers in case of the rust preventives coated in the cold rolled steel. Does anybody have any article stating the non-correlation of the salt spray tests in case of rust preventives (mineral oil based).
Thanks and warm regards,I. Banerjee
- Kolkata, India
I have not heard that; but it may well be true.
However, salt spray testing is a very useful tool--not to estimate real-world life but to demonstrate consistency and quality in processing. If you are getting inconsistent salt spray test results, while it is perhaps possible that oiled finishes always perform inconsistently, I also would not dismiss the possibility that you are trying to throw out the most powerful quality control tool in your arsenal.
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha
Automotive companies are increasingly moving towards using cyclic corrosion test methods such as GM9540P and SAE J2334 [affil. link to spec at Techstreet]. These tests use different test solutions and chamber conditions in an attempt to correlate lab results to proving ground results and real-life service. I don't think any corrosion test directly correlates to real life or any other test, but cyclic tests may be better.
Rochester Hills, Michigan