Wide range of coatings for steel and foundry industry: water and alcohol based, foam and other coatings

Coatings for Steel Castings

Utilization

For various sand cores and moulds made with all types of resin binders and sodium silicate sand.

Features

  • Good suspension properties, thixotropy, levelling properties, and easy ignition for those that are alcohol based. Brushing, flowing and spraying for medium and large moulds and cores. Dipping for small cores.

  • The coating layer has good strength, low gas emissions, no cracks and no bubbling. It also has excellent impact resistance and low permeability. Recommended for high pouring temperatures of steel casting.

  • Smooth surface, which leads to a good surface finish on the casting, the elimination of surface defects, and obviously an improvement in surface quality.

Type Solvent Refractory Application field Coating method
FQ7 Alcohol Zircon powder Steel casting with a thick section Brushing, flowing
FQH500 Alcohol Zircon powder Medium steel casting Brushing
FQ5 Alcohol Zircon powder Small to medium steel casting with a thin section Brushing, flowing
FQ4 Alcohol Corundum powder Steel casting for small to medium sized engineering machines Brushing, flowing
FQ400 Alcohol Magnesium powder High-manganese steel casting Brushing, flowing
Type Solvent Refractory Application field Coating method
FS80 Water Zircon powder High alloy steel casting Brushing, dipping
FS290 Water Forsterite powder High-manganese steel casting Brushing, dipping
FS500 Water Zircon powder Small to medium steel casting Brushing

Coating for iron castings

Type Solvent Refractory Application field Coating method
FQ507 Alcohol Graphite compound Medium to large iron casting Brushing, flowing
FQ607A Alcohol Graphite Medium iron casting Spraying
FQ707 Alcohol Graphite Large iron casting Brushing
FQ600 Alcohol Zircon powder compound Large iron casting with heavy section Brushing, flowing
FQ10 Alcohol Forsterite powder Reduce or eliminate the sulfurizing defect on surface of iron casting Brushing, flowing
FQ580 Alcohol Bauxite powder Iron casting with heavy section Brushing, flowing
Type Solvent Refractory Application field Coating method
FS580 Water Bauxite powder Medium to large iron casting Brushing
FAS201 Water Graphite powder Automative casting Brushing, dipping
FS607 Water Graphite Medium to large iron casting with heavy section Brushing, Spraying

Utilization

For various sand cores and moulds made with all types of resin binders and sodium silicate sand.

Features

  • Good suspension properties, thixotropy, levelling properties and easy ignition for those that are alcohol based. Brushing, flowing and spraying for medium and large moulds and cores. Dipping for small cores.

  • The coating layer has good strength, low gas emissions, no cracks and no bubbling. The layer has excellent impact resistance and low permeability. Recommended for iron casting.

  • Smooth surface, which leads to good surface finish on the casting, the elimination of surface defects, and obviously improvement in surface quality.

Lost Foam Coatings

Utilization

For lost foam casting process.

Features

  • Outstanding high-quality refractories are used for the lost foam series of coating, using high refractory filler, with excellent sandburn resistance performance. It is easy to peel off after pouring, which leads to good surface finish. Application for lost foam V-Process and EPC process.

  • The coating layer has good adhesion, no cracks and high strength. It is reinforced in the polystyrene foam pattern and reduces the deformation by moulding.

  • Excellent permeability and low gas emissions, reduces the common defect of the elephant skin and carbon deposition caused by pyrolysis of the polystyrene foam.

Type Solvent Refractory Application field Coating method
FS-EPC10 Water Bauxite powder Small to medium lost foam iron casting-like box Brushing, flowing, dipping
FS-EPC20 Water Graphite powder compound Medium to large lost foam iron casting like tooling Brushing, flowing
FS-EPC30 Water Zircon powder Lost foam steel casting Brushing, flowing
FS303 Water Forsterite powder Lost foam High-manganese steel casting Brushing, dipping
Type Solvent Refractory Application field Coating method
FQ800E Solvent Mullite powder Medium to large lost foam iron casting Brushing, flowing
FQ2S Solvent Zircon powder compound Large lost foam iron casting Brushing

Specialized coating

Type Solvent Refractory Application field Coating method
FQV506 Alcohol Graphite powder compound Small to medium iron casting by V-process Spraying
FQ800V Alcohol Mullite compound Large iron casting by V-process Spraying
FQV600 Alcohol Zircon compound powder Small to medium steel casting by V-process Spraying
FQV500 Alcohol Zircon powder Medium to large steel casting by V-process Spraying
FQT100 Alcohol Tellurium powder compound Chill coating, mainly for small iron casting by green sand automated moulding line Brushing, Spraying

FQV series of alcohol based V-Process coating

Utilization

For V-Process casting.

Features

  • Excellent adhesion and adhesive strength to the plastic film.
  • Good permeability, high strength, high refractoriness and excellent sand burn-on resistance which leads to good surface finish.

FQT100 alcohol based chill coating

Utilization

For iron casting such as engines.

Features

  • Excellent thixotropy with good suspension, easy to apply by brushing or dipping.

  • Good chill performance, application on the hot spot or section with poor heat radiation can prevent defects like shrinkage and bleeding.

Flow coating process technology

  • The practice of flow coating, is to use liquid coating at a proper viscosity to water (over pour) the sand core or mould from top to bottom by gravity, it is suitable for medium to large sand core and moulds.
  • According to the coating fillers, flow coating can be used for steel, iron or aluminium castings.
  • Application is fast therefore it improves productivity.
  • No operator special skill in comparison with brushing, only a minimal training of the operator is needed.
  • Environment and solvent evaporation is significantly reduced compared to spraying.

How to control the coatings

Coatings play an important part of the final quality of the castings, we should pay attention to the quality of the coatings used and the correct application. Control of the diluted coatings should be done correctly. There are several methods to measure the quality of the coatings before application:

  • Density ( it is usually done weigthing 100 ml of the diluted coating in a mesh cylinder)
  • Degré Baumé: Using a Baumé meter
  • Flowing time: Using a Ford cup N°4

And after application, to control the thickness of the layer:

  • Thickness in mm using a “coating thickness comb”

SQ special flow coating equipment

Besides the flow coating tank, the coating is always in closed loop and circulation status, reducing solvent evaporation. Baume of the coating is easier to control. Each flow coating machine can be supplied with two sets of flow coating tanks thus allowing the coating of two sand cores at the same time.

Comparing the normal flow coating method, the coating consumption can be reduced by about 20%.

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