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This procedure covers the minimum requirements on the surface preparation and painting / coating for the touch-up and repair of damaged external or internal surfaces of existing structures and facilities including structural steel works, process piping, pressure vessels, galvanized surfaces and equipment. PURPOSE.
18 de sept. de 2002 · Field Touch-up and Repair How should contract documents address the problem of job-site mill-scale flaking? When SSPC-SP2 (hand tool cleaning) or SSPC-SP3 (power tool cleaning) surface preparation is specified and a short-exposure-life prime coat is subsequently applied, tight mill scale generally remains on the surface prior to shop ...
This method statement outlines the general requirements for the touch-up/repair of painted surfaces of steel structures, galvanized surfaces and process piping.
To touch-up damage paint on steel structures: clean the damaged area with a wire brush to remove all loose paint, dust, grease and salts; apply one coat of paint to the cleaned area and let dry; then apply additional coats as needed to match the thickness of the original surrounding paint.
The touch-up and repair of hot-dip galvanized steel coatings is important to maintain uniform barrier and cathodic protection as well as ensure longevity. The AGA has an online video series for Touch-Up and Repair of Hot-Dip Galvanized Steel.
ASTM A780 contains three acceptable methods of touch-up and repair of hot-dip galvanized steel: Zinc-Based Solders. Soldering is done with zinc-based alloys in either a stick or powder form. The area being repaired needs to be preheated to approximately 600 F (315 C).
4 de dic. de 2000 · The surface of the steel should be clean, dry, and free of oil, grease, and preexisting paint or corrosion by-products. The paint should be applied in accordance with the manufacturer's recommendations and the paint should be allowed adequate time to cure between applications.
