Acidic Liquid Degreasing Chemical Formulations

Acidic liquid degreasing solution provides mild degreasing, cleaning and very mild formation of phosphate on metal components. It can be diluted with 5 times of volume of industrial water. For a better performance on more rusted components, the dilution ratio may be accordingly reduced. Painting should be done on the treated components immediately after wiping of with dry cloth. White patches should be wiped off. It the white patches are aggressive the solution may further be diluted.

Acidic liquid degreasing solution provides mild degreasing, cleaning and very mild formation of phosphate on metal components. It can be diluted with 5 times of volume of industrial water. For a better performance on more rusted components, the dilution ratio may be accordingly reduced. Painting should be done on the treated components immediately after wiping of with dry cloth. White patches should be wiped off. It the white patches are aggressive the solution may further be diluted.

# Materials Quantity, kg
  Phosphoric acid 80% solution 26
  Butyl cellosolve 5.5
  Ethyl cellosolve 18
  Water 50
  Sodium hexametaphosphate 0.5
  Yield 100

Raw materials:

  1. Phosphoric acid solution concentration may be of 80 to 85% of industrial grade.
  2. Butyl cellosolve and ethyl cellosolve are industrial grade organic solvents. If ethyl cellosolve is not available, it can be replaced by butyl cellosolve. However, it may slightly affect the performance of the cleaning action.
  3. Industrial water is ideal for the making up the solution. Hard water may disturb the performance of the solution.
  4. Sodium hexametaphosphate is a mixture of polymeric metaphosphate surfactant. It also acts a sequestering agent.  It is available in the powder form.

Procedure

  1. Dissolve item 5 in 4 in a stainless steel or plastic container using a mixer.
  2. Add item 1 followed by items 2 and 3
  3. Ensure thorough mixing

Features of liquid acidic degreaser

  • Mild steel and aluminium components can be cleaned with this solution
  • Dilution ratio for applying on the metal: 1:5 in industrial water.
  • Application: By brushing or swabbing using proper gloves. Should be wiped off immediately with dry cloth after the formation of thin and mild phosphate layer.
  • Should be painted within an hour.
  • Caution: Leaving the substrate with this solution without wiping may lead to formation of mild rust.

Other Recommendations

In case of aggressive condition of the surface of the metal components, the following sequence of operations may be adopted.

  1. Sanding with emery sheets of various grades
  2. Solvent degreasing with cleaning thinner (Formula guidelines included)
  3. Air drying
  4. Application of acidic liquid degreasing solution
  5. Dry wipe off

Formulation of cleaning thinner

S No. Raw materials Quantity (kg)
1 Mixed Xylene 50
2 Acetone 30
3 n-Butanol 6
4 Methyl isobutyl ketone 4
5 n-Butyl acetate 7
6 Ethyl cellosolve 3
  Total 100

*Can be mixed using a mechanical stirrer.