A study on the corrosion of stainless steel floor drains in an indoor swimming pool

Pitting Corrosion of the Resistance Welding Joints of Stainless Steel Ventilation Grille Operated in Swimming Pool Environment

“…On the contrary, base metal was less corroded (Figure 3). On the whole, the morphology of identified pits indicates pitting corrosion attack [6,7,10]. Examination of HAZ acknowledged visible severe pitting action, Figures 3 and 4(a), and generation of deep cracks in between welded rods, Figures 3 and 4(b).…”

“…Deposits contain chemical elements which came from swimming pool environment and are used for swimming pool water treatment (e.g., Cl, Ca, Table 2). In particular, chlorine compounds play a major role in the pitting corrosion processes [6,7] and content of chlorine in deposits equals 5.3%. In addition, the relatively high temperature of water and air in the swimming pool causes evaporation of chlorinated pool water.…”

“…Grade 1.4404, due to the presence of molybdenum and nitrogen, is described in the literature, as dedicated to the production of equipment and design of swimming pools [1][2][3][4]. However, in specific swimming pool applications, elements manufactured 2 International Journal of Corrosion from stainless steel grade 1.4404 undergo pitting corrosion, as described in [7]. Works [1-4, 6, 7, 9] describe examples of negative consequences of corrosion phenomena, observed for stainless steels used for swimming pool equipment.…”

“…Works [1-4, 6, 7, 9] describe examples of negative consequences of corrosion phenomena, observed for stainless steels used for swimming pool equipment. The effects of the general or pitting corrosion are usually losses related to the necessity of exchanging corroded elements, such as the case of corrosion of the ventilation duct [6] and drain [7] operated in the pool. In the case of load-bearing elements, pitting corrosion can cause the development of stress corrosion [9,10].…”

“…Pitting is an extremely localized attack that is manifested by holes, or pits, in the metal surface as well as especially in heat affected zones of weld joints [11][12][13]. Pitting is a particularly insidious form of corrosion since it is difficult to detect until the structure has been severely attacked [4,6,7,12,14].…”