This document specifies methods for determining corrosion rates with standard specimens of metals in indoor atmospheres with low corrosivity. For this direct method of evaluation corrosivity, different sensitive methods can be applied using standard specimens of the following metals: copper, silver, zinc, steel and lead. The values obtained from the measurements are used as classification criteria for the determination of indoor atmospheric corrosivity.nd edition 2020-05 Corrosion of metals and alloys — Classification of low corrosivity of indoor atmospheres — Part 2: Determination of corrosion attack in indoor atmospheres Corrosion des métaux et alliages — Classification de la corrosivité faible des atmosphères d'intérieur — Partie 2: Détermination de l'attaque par corrosion dans les atmosphères d'intérieur Reference number ISO 11844-2:2020(E) ？ ISO 2020 ISO 11844-2:<