BS-7079:2009 pdf free download – General introduction to standards for preparation of steel substrates before application of paints and related products.
3.13 flame cleaning
process by which a reducing flame is applied to a surface, followed by manual or mechanical cleaning operations
[BS EN ISO 46 18:2006]
3.14 flash rust
rapid formation of a very thin layer of rust on a steel substrate after abrasive blast-cleaning or water jetting
3.15 grit
particles that are predominantly angular, that have fractured faces and sharp edges and that are less than half-round in shape
[BS EN ISO 11124-1:1997, BS EN ISO 11126-1:1997]
3.16 hackles
thin raised slivers of steel, still attached to the substrate, which are caused by the impact of abrasives on a steel surface during blast-cleaning and which sometimes protrude above the other peaks
[BS EN ISO 8503-1:1995]
3.17 hand-tool cleaning
cleaning or preparing steel substrates by the use of hand tools, without power assistance
NOTE Chipping hammers, hand scrapers, hand wire brushes, abrasive papers and plastic fleece with embedded abrasive are generally used. Hand-tool cleaning is sometimes carried out initially in order to remove relatively loose contaminants prior to the use of power tools.
3.18 high-pressure water jetting
water jetting that involves the use of water pressurized to above 70 MPa
NOTE Water jetting using higher pressures might remove loose mill scale from a steel surface, but it does not impart a surface profile to the substrate.
[BS EN ISO 8501-4:2006]
3.19 machine abrading
surface preparation procedure comprising cleaning by thorough mechanical roughening and, if necessary, by rotating wire brushes, possibly supported by the application of needle guns
3.20 mill scale
layer of iron oxides formed during the hot rolling of steel
[BS EN ISO 4618:2006]
3.21 pitting
formation, due to corrosion, of small cavities in a steel substrate
3.22 power-tool cleaning
cleaning or preparing steel substrates by the use of power-assisted hand tools, but excluding blast-cleaning
NOTE Rotary de-scalers, rotary wire brushes, sanding machines, sanding discs, rotary abrasive-coated paper wheels (flap wheels), abrasive grinders, plas tic fleece with embedded abrasive, chipping hammers and needle guns, driven by electric or pneumatic power, are examples of equipment generally used.
3.23 pre-fabrication primer
fast-drying primer that is applied to blast-cleaned steel to protect it during fabrication of a structure while still allowing the steel to be welded
[BS EN ISO 4618:2006]
3.24 preparation grade
degree of visual cleanliness of a steel surface after corrosion products and/or contaminants have been removed by a preparation method
[BS EN ISO 4618:2006]
3.25 primary profile
original surface profile prior to surface preparation
3.26 priming coat
first coat of a coating system
[BS EN ISO 4618:2006]
3.27 rogue peaks
isolated peaks, substantially higher than the surrounding peaks, normally caused by the presence of over-sized abrasive in the abrasive mixture used during blast cleaning with grit abrasives
[BS EN ISO 8503-1:1995]
3.28 rust grade
degree of mill scale and rust on a steel surface prior to cleaning
[BS EN ISO 4618:2006]
3.29 secondary profile
surface profile resulting from the effect of surface preparation on the primary profile
3.30 shop primer
protective coating material for application in the workshop to a component that is subsequently to be finished on site.