Sind Vorbehalte gegenüber einer Verwendung verzinkter Bauteile in Hallenbädern gerechtfertigt?

Are reservations against the usage of galvanized building elements for indoor pools justified?

According to DIN EN ISO 12944, part 2, the corrosion exposure in indoor pools falls under corrosion category C4 (severe corrosion exposure). Consequently, the zinc corrosion of the galvanized building elements exposed to an indoor pool atmosphere would amount to several micrometers. However, this kind of corrosion behaviour does not correspond with the practical building experiences.
This paper pertains to chemical corrosion in a pool atmosphere. Furthermore, the investigations of galvanized building elements in up to 40-year-old indoor swimming pools are summarized and the results of long-time zinc corrosion in a rather critical pool atmosphere are presented. Accordingly, the zinc corrosion in a normal indoor pool using tap water is substantially lower than stated in DIN EN ISO 12944. It is proposed that account should be taken pertaining to this issue.