Maintenance workpiece:sand pump guard jacket repairing.
Material: grey cast iron.
The condition before repairing:abrasion caused perforation.
Material selection: BD7021 super wear resistant coating,BD426T special undercoat(topcoat).
Construction tools: angle grinder,wire brush,grinding wheel,plaster knife,plastic knife,rubber hammer,special rounding tools.
Auxiliary materials: cleaning agent,duster cloth,gloves,hair brush,electronic scale.
Construction technology of BD7021 super abrasion resistant coatings:
1.Clean up and polish the pending-repair workpiece on the needing-repair part.
2.Configure BD426T special undercoat and brush coating on the pending-repair part.
3.Configure BD7021 super wear resistant coating and be coating on the pending-repair part,knock on it to be compacted with rubber hammer,then trim the surface with special rounding tools,make the surface to be flat and smooth.
4.Configure BD426T special undercoat and brush coating on the workpiece surface of repairing part as the topcoat.
5.Curing for 24 hours.
Material utilization amount: 75Kg BD7021 super wear resistant coatings, 1.5Kg BD426T special undercoat.
Repairing effect: The working life of new pump is 3-4 months,the working life after repairing is about 8 months.
