Sand blasting, surface preparation

The metal plates to be coated with Raney nickel were type 304 stainless steel. Plate surfaces were prepared by sand blasting with an iron-free... 

Unless otherwise specified, the vendor shall commercially sand blast, in accordance with SSPC SP 6, all grout contact surfaces of the baseplate, and coat those surfaces with inorganic zinc silicate in preparation for epoxy grouting. 

Blasting - Surface cleaning and preparation of substrate using abrasives such as airborne sand, grit or shot. 

Typical surface preparation calls for cleaning with acetone, MEK, or other common solvent. Once clean, the substrate is then mechanically abraded with sand, grit or vapor blast, or steel wool. The surface is again wiped clean with fresh solvent. Typical adhesives that are employed include epoxies, urethanes, and cyanoacrylates. Polysulfides, furanes, and polyester adhesives have also been suggested. 

Surface preparations must be carefully controlled for reliable production of adhesive-bonded parts. If a chemical surface treatment is required, the process must be monitored for proper sequence, bath temperature, solution concentration, and contaminants. If sand or grit blasting is employed, the abrasive must be changed regularly. An adequate supply of clean wiping cloths for solvent cleaning is also mandatory. Checks should be made to determine if cleaning cloths or solvent containers have become contaminated. 

The surface tension of various solutions was measured by the Wllhelmy plate technique with a sand blasted platinum plate as the sensor. Fluorescence measurements were carried out using a Perkln-Elmer LS 5 spectrophotometer. The solutions for fluorescence measurements were prepared using pyrene saturated ( 10 6kmol/m3 )... 

Adhesives, prepared in the Sigma mixer, are tested for their viscosity and homogeneity before application onto the surface of the vessel to be lined. It is usual to give a first and primer coat of the adhesive over the blasted surface immediately after sand blasting. 

If a scheduled maintenance approach is instituted and followed, with periodic spot touch-up and an occasional full coat applied over the entire surface, extensive costs of total surface preparation (such as complete sand blasting removal of the old coating) can be avoided. 

For the elimination of corrosion products on a construction (ship, tank, etc.), in order to refresh the surface, for example, as a preparation for lacquering, sand blasting is the best approach. Solutions of corrosive products should never be introduced in a tank, ship, etc., because it is often difficult to properly rinse surfaces of intricate shapes such as those of tanks, ships, etc. The retention of pickling chemicals may eventually lead to severe corrosion. 

Following surface preparation by sand blasting, a high-temperature repair sleeve was applied to reinforce the weak area. 

After surface preparation by sand blasting, the Clock Spring Snap Wrap was applied for 1 m of total length to restore the capability of the operating caisson. The repair was made within 2 days with a man crew of only four. 

Slippery surfaces can be temporarily corrected through the use of peel-and-stick tread tapes, sand added to paint, and chemical etches. But all of these remedies wear quickly and could possibly pose additional problems. Permanent coatings should not be applied until the floor has been meticulously cleaned of all grease, dirt, paint, oil, tar, glaze, surface hardeners, loose mortar, and cement. Light abrasive blasting and acid etching are two of the more common preparation techniques. 

---