Assessment of the Adhesion of Phosphate layer on the metal surface with roofing Waterproofing material and Polyurethane glue

Objective. Evaluation of phosphate film adhesion is necessary to increase the durability and reliability of roofs, ensuring protection against corrosion, tightness and costeffectiveness of construction. Conduct a study of the adhesive bonding of a phosphate film on a metal surface with a roofing waterproofing material glued with polyurethane glue.

Method. A film was formed on the surface of St3 steel plates by treating the metal surface with a rust converter. An experimentally improved formulation of a corrosion converter based on orthophosphoric acid with the addition of Lewis acid (or acid salts) is proposed. 150x150 mm metal plates were used, to which a fleece-backed waterproofing material was adhered using roofing polyurethane adhesive. Half of the samples were treated with the corrosion converter, while the other half were left untreated, displaying old metal corrosion on the surface. The roofing waterproofing material was peeled off using an ONIKS-1.AP.005 adhesion tester according to GOST 28089-2012 and GOST 28574-2014.

Result. The average adhesion strength of the phosphate film with polyurethane adhesive is 0.413 MPa, which is 4.03% higher than that of the surface of untreated metal without corrosion and 21.47% higher than that of metal with surface corrosion.

Conclusion. The modified phosphate film has increased adhesion to adhesives, and in the future, possibly to paint and varnish coatings and concrete.

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