Degradation Processes in Anticorrosive Coatings for Machinery Designed for Fertiliser Application

Abstract

In agricultural practice, anticorrosion protection of steel components is utterly indispensable. It is of particular importance for machines and devices working in an environment with increased corrosion activity. The aim of the present publication is the analysis of the use of 5 types of anticorrosion protection in machines with increased corrosive stress. These are coating systems based on alkyd and acrylic resins. Anorganic anticorrosion system is represented by a coating created by hot-dip galvanising. A system of duplex protection created by hot-dip galvanising and organic alkyd‑urethane coating system will also be examined. The experimental section of the publication can be divided into two sub-domains. The first is focused on the analysis of the mechanical properties of anticorrosion coating. The analysis is performed via the Erichsen elasticity test according to EN ISO 1520:2001 and a pull-off test according to EN ISO 4624:2003. The individual results allow the estimation of the resistance against delamination of the surface layers. The second domain is focused on the corrosion resistance of individual coatings in an environment with increased corrosion stress. The tests were performed in salt mist environment in accordance with EN ISO 9227:2012. A cyclic test was also performed with the use of DAM 390 industrial fertiliser. It is a long-term test where significant correlation with real conditions can be assumed.

Keywords

• corrosion
• anticorrosion protection
• organic coating systems
• galvanising
• mechanical properties of the coating