Abstract
This paper analyses the effect of the presence of rust at the metal/paint interface on the behaviour of different paint systems used for protecting the structural steel exposed to the atmosphere. The paint systems were applied as films of variable thickness over rusted steel surfaces cleaned to different grades of surface preparation (Sa3, Sa2(1/2), Sa2 and St2). Pre-rusting of steel was carried out in a clean (uncontaminated) rural atmosphere. Atmospheric exposure tests were conducted for 14 years at three Spanish test sites of different atmospheric corrosivity. Exposed specimens were evaluated for rusting and blistering, as well as for delamination of the paint system on both sides of a scribe made in the paint film. The results reveal that in some cases the presence of rust has a negligible influence on the durability of the paint system applied. Those systems including a zinc-rich (ethyl silicate) primer were found to provide the most effective protection against corrosion under all types of conditions tested.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
