Abstract
This work focuses on the pitting corrosion of ventilation grilles operated in swimming pool environments. The ventilation grille was made by resistance welding of stainless steel rods. Based on the macroscopic and microscopic examinations, the mechanism of the pitting corrosion was confirmed. Chemical composition microanalysis of sediments as well as base metal using scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS) method was carried out. The weldments did not meet the operating conditions of the swimming pool environment. The wear due to the pitting corrosion was identified in heat affected zones of stainless steel weldment and was more severe than the corrosion of base metal. The low quality finish of the joints and influence of the welding process on the weld metal microstructure lead to accelerated deposition of corrosion effecting elements such as chlorine.
Highlights
The aesthetic appearance and the ease of keeping the surface clean, good strength properties, ductility, weldability, and corrosion resistance make the use of stainless steels encouraging for elements of the construction and equipment of swimming pools like ventilation grilles
We proposed that grilles produced by resistance welding process could not met requirements of harsh operating pool environment due to difficulties connecting to finishing treatment of weldment
The case study on the subject of the pitting corrosion of resistance welding joints found in the stainless steel ventilation grille utilised in a swimming pool environment was investigated in the work
Summary
The aesthetic appearance and the ease of keeping the surface clean, good strength properties, ductility, weldability, and corrosion resistance make the use of stainless steels encouraging for elements of the construction and equipment of swimming pools like ventilation grilles. Polymer materials such as ABS (acrylonitrile butadiene styrene) and PVC (polyvinyl chloride) are relatively cheaper than stainless steel and can be operated in pool conditions, none of them matches all the mentioned beneficial properties of stainless steel.
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