Salt Spray Testing - Why It Should Not Be Used To Compare Different Types of Coatings
Salt Spray Testing - Why It Should Not Be Used To Compare Different Types of Coatings
Salt Spray Testing - Why It Should Not Be Used To Compare Different Types of Coatings
Firstly, the test does have some value for quality control
There are some obvious reasons why the salt spray test
Summary
The use of salt spray test results to guide selection of
protective coatings for steel remains a serious problem in
the engineering community. Despite the well understood
limitations of the test in the corrosion world, it still used to
promote the use of coatings whose properties happen to
produce apparently favourable results. It is hoped that this
article has given some insight into the scientific background
to the limitations of this type of accelerated testing. Despite
the attractiveness of quick and short-term information,
there is no substitute for corrosion data generated from
long-term exposure testing and case history information
from real structures or components in service.
References
1 ISO 9227 Corrosion tests in artificial atmospheres salt
spray tests.
2 Skerry, J S, Alavi, A and Lindgren, K I. Environmental
and Electrochemical Test Methods for the Evaluation of
Protective Organic Coatings, J of Coatings Technology, vol
60, No 765, p97.1988.
3 Appleman, B. Cyclic Accelerated Testing: The Prospects
for Improved Coating Performance Evaluation, J
Protective Coatings & Linings, p71-79. Nov 1989.
4 Townsend, H E. Development of an Improved Laboratory
Corrosion Test by the Automotive and Steel Industries,
June 2013