from the conferences organized by TANGER Ltd.
In the work fasteners - screws M8*80 made of carbon steel 23MnB4 were being examined that are conventionally protected against the corrosion by zinc galvanizing. The research aim was to compare the lifetime/effectiveness of different zinc coatings (galvanic, hot-dip and lamellar), as the anticorrosion protection of steel fasteners. The first research stage consisted in determination a point of reference - kinetic of the screws corrosion process without a protective coating in the climatic chamber, in neutral salt fog according to PN-EN ISO 9227. Both loss of mass and pitch diameter reduction were measured. Next, a change of mechanical properties was determined performing the static tensile test using samples taken after the individual stages of experiment (0 h, 360 h, 624 h, 672 h, 744 h, 888 h, 1000 h). Additionally to enable the more detailed description of the kind and the mechanism of the corrosion from studied fragments of elements the metallographic micro-sections were prepared, on which microstructure and hardness changes were determined. The conducted tests showed that the examined corrosion process apart from essential changes of mass caused also the significant reduction of mechanical properties. In further research the influence of individual types of zinc coating on the kinetics of corrosion process will be presented.
Keywords: fasteners, zinc coatings, corrosion kinetic© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.