The ISO 23226-2020 standard provides detailed guidance for corrosion testing of metals and alloys exposed to deep sea water. Includes test site selection, specimen preparation, test procedures, and evaluation methods after retrieval from exposed sites. The standard is applicable for evaluating the corrosion behavior of metals and alloys in deep sea environments, such as localized corrosion and stress corrosion cracking, etc. The guide also has reference value for testing of Miscellaneous materials in deep sea, but does not include performance testing of sacrificial anodes for deep sea cathode protection.