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ECOSUS - Ecologically Sustainable Pretreatments for Painting Multimetal

Reference number
Coordinator Swerea IVF AB - Avdelningen för processutveckling
Funding from Vinnova SEK 3 950 000
Project duration June 2013 - April 2017
Status Completed
Venture FFI - Sustainable Production
End-of-project report 2013-01276eng.pdf (pdf, 737 kB)

Purpose and goal

1. A developed/optimized thin film process/product that gives a corrosion protection as good as ZnPh. Systematic studies correlating process parameters film structure/composition - corrosion. Process/product development will be performed by chemical suppliers cooperating with the project team. 2. Predict the long term performance of the new coatings. 3. Introduce thin film technology at a paint shop/subcontractor treating one/few substrates. 4. Investigate Nickel-free ZnPh as an alternative pretreatment.

Expected results and effects

A deeper understanding of the relationship between process parameters, corrosion and coating composition has been achieved. For hot dip galvanized steel and hot rolled steel the corrosion performance are on the same level as for ZnPh but on cold rolled steel there is still a larger paint delamination. 6 week accelerated testing (ACT) showed higher impact than 3 years of field tests. Evaluation of methods for measuring the adhesion and for quality assurance. Ni-free ZnPh had similar results as ZnPh, but needs to be verified Contaminations on surface have a severe impact on corrosion.

Planned approach and implementation

The main objective was to Develop/optimize a thin film process/product that gives a corrosion protection as good as ZnPh by systematic studies correlating process parameters film structure/composition - corrosion protection. It has been cooperation with chemical suppliers. 3 panel applications have been performed. The two first had the focus on process variations, corrosion and coating composition. The third investigated how the cleanliness affects the corrosion and adhesion.

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 20 February 2020

Reference number 2013-01276

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