Coastal corrosion in the Gulf: salinity, humidity and heat
The Arabian Gulf is saltier and warmer than the open ocean. For coastal facilities that means corrosion needs to be treated as a reliability variable.
The Arabian Gulf is a shallow, semi-enclosed sea with high evaporation. Its salinity is typically around 39–42 PSU, higher than the global ocean average of about 35, and summer sea-surface temperatures can exceed 32°C. Onshore winds carry chloride-laden aerosols inland, where they deposit on equipment.
How corrosivity is classified
ISO 9223 classifies atmospheric corrosivity from C1 (very low) to CX (extreme), based on time of wetness, chloride deposition and sulphur dioxide. Coastal industrial locations in the Gulf are frequently assessed in the higher categories, which directly affects coating selection and inspection intervals.
Most exposed equipment
- Aluminium-fin condenser coils and cooling-tower components
- Outdoor electrical enclosures, terminations and transformer tanks
- Seawater intake pumps and wetted parts
- Structural steel, pipe supports and fasteners
Practical measures
Coil coatings, appropriate material selection, regular washing to remove chloride deposits, sacrificial anode inspection and enclosure sealing are established mitigations. Tracking local exposure per asset helps schedule them where they matter most.
- ISO 9223 — Corrosion of metals and alloys: Corrosivity of atmospheres — Classification, determination and estimation
- ISO 12944-2 — Paints and varnishes: Corrosion protection of steel structures by protective paint systems — Classification of environments