Surface Preparation

It cannot be stressed strongly enough that the key to Zinga's long life is in the thorough preparation of the steel substrate to the correct specification. Please always follow the appropriate Zinga UK specification in conjunction with the relevant Technical Data Sheets. (TDS)

The following information will give a general guide to the coating and its application.

Marine structures


remove all crustacean growth using either a UHP water-jet or a high-pressure wash-down
dry off
blast-clean to Sa2.5 cleanliness

Old or worn galvanising, thermally sprayed zinc (TSZ) or old Zinga

steam-clean to remove all contamination from porous surfaces
dry off
blast-clean as normal

New steel

steam-clean or high-pressure wash-down all surfaces
allow to dry
blast-clean to a cleanliness standard of Sa 2.5

New galvanised steel

Steam-clean
Sweep-blast the surface/s at a blast-pressure of 55 psi using a 45o nozzle angle to avoid removing any existing zinc thickness.

Cast-iron

steam-clean or high-pressure wash-down
allow to dry
blast-clean to SA2.5 cleanliness

Aluminium alloys

solvent clean as per SSPC-SP1 Standard,
blast-clean with aluminium-oxide media grade 3
vacuum surface/s before paint application


Note 1: The term "high pressure" means a minimum water-pressure of 10,000psi. Any pressures below this level will not totally remove engrained chlorides.

Note 2: The grit used on all structural steelwork must comply with 50µm and 80µm depending on the type of application). The chosen grit should always be able to achieve a blast roughness of 12.5 to 15 microns. It should be noted that UHP Blasting does not create a profile and should therefore never be used as the sole means of surface preparation. UHPAB is an excellent form of blast-cleaning for marine structures as it removes all crustacean growth, scale, engrained chlorides and invisible contaminants

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