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.

Duplex Anti-Corrosion Protection of Steel Using a Combination of Hot-Dip Galvanising and Water-Soluble Paints

“…In this regard, the duplex system has a longer service life than both service lives of two coatings applied separately. Thus, in the duplex system, there is a mutual synergistic effect of the inorganic and organic coatings (Votava et al, 2016).…”

Change of Mechanical Properties of Zinc Coatings After Heat Treatment

“…On the basis of measurement results, it can be concluded that the bigger and/or longer the heat treatment, the higher the microhardness (Table 3). Changes in mechanical properties can be caused by diffusion of ferrum from the base material to the zinc coating (Zmrzlý et al, 2005). However, the disadvantage of this process lies in lowering of the anticorrosion protection of the inorganic coating.…”

“…The ability of the anticorrosion system to withstand dynamic and static stress is one of the criteria for the quality evaluation of protective coatings. In this respect, one of the most important characteristics is the adhesion between the anchoring profile of the base material and the coating substrate (Votava et al, 2016).…”