Sandblasting technology

Blasting is a special technique, where a pneumatic acceleration of abrasive particles is achieved by means of compressed air. By using a dedicated nozzle, the medium is applied on the surface by using a pressurised air flow.

Different abrasive media are used, different blasting nozzles and different air pressure levels (from 2 to 10 bar). All these procedures ensure a controlled impact of the media on the processed surface.

Scope of sandblasting use

  • Automotive and aviation industry
  • Pharmaceutical and chemical industry
  • Construction and metal industry
  • Electrical industry
  • Tool industry
  • Maintenance of technology processes in all industries (food, chemical, and pharmaceutical)

Sandblasting quality standards

SANDBLASTING STANDARDS 

DESCRIPTION OF THE PROCEDURE

INDICATIVE TIMING SANDING OF STANDARD A CORROSION A m2/h

Sa 1

Fast surface sandblasting that removes up to 50% of visible dirt, foreign matter and rust.

20 m2/h

Sa 2

More thorough sandblasting, which removes up to 65% of stubborn dirt, foreign matter and rust. A lower quality of intervention is required.

12 m2/h

Sa 2,5

Careful and precise sandblasting that removes up to 85% of all dirt, foreign matter and rust. The surface is almost completely smooth after treatment, and traces of rust damage are barely visible. Medium quality intervention is required.

8 m2/h

Sa 3

Demanding sandblasting that removes 100% of all dirt, foreign matter and rust and metal to clean metal. The highest quality of intervention is required.

3-4 m2/h

Sandblasting quality

Advantages of sandblasting

  • Recycling materials
  • Processes without using chemicals
  • Safe and harmless process
  • User-friendly
  • Common use in many industries

Corrosion rates on iron surfaces

ATMOSPHERFX CORROSION

CORROSION IN WATER

UNDERGROUND CORROSION

CONTACT CORROSION

How to define the stage of corrosion on iron surfaces?

INTERNATIONAL AGREEMENT ON MEASUREMENT RULES

CORROSION RATE ON IRON SURFACES

A

Steel surfaces completely covered with a compact surface layer.

B

Onset of corrosion and partial peeling of the layer.

C

Visible corrosion or peeling layer.

D

Completely fallen off layer and deeply corroded surface.

Metering

  • Surface roughness (Rz, Ra, Rµ...)
  • Coverage
  • Processing intensity
  • Surface microscopy
  • Coating thickness (paint, galvanic protection...)
  • Mobile electronic macro lenses for field measurements
  • Expert cooperation with science-research institutions

Measurements

A practical example of measurement

  • OBJECTIVE: a correct surface preparation with the blasting process for anticorrosion coating
  • Left - not blasted = low paint adhesion, right - blasted = excellent paint adhesion
  • Roughness metering (Ra, Rz, Rt...) with a dedicated and calibrated metering device
  • Processing testing surfaces with different parameters until the desired roughness/structure is achieved
  • Transferring the “recipe” for processing to the customer’s components 

measurement

Ra - The arithmetic mean percentage of the profile or. the arithmetic mean of the absolute values of all points of the surface profile in the measuring range.

Rz - Maximum profile height or the distance between the highest and lowest point of the surface profile in the measurement area.

Rv - Maximum height of profile recesses or the distance of the lowest point of the surface profile from the midline in the measurement area.

Rp - Maximum height of profile protrusions or the distance of the highest point of the surface profile from the midline in the measurement area.

Blasting with sodium bicarbonate

Blasting with sodium bicarbonate is suitable for sensitive surfaces, where the basic material must not be roughened. The process is extremely effective for removing mould, paint, dirt, burns, oils, lubricants, and sealants. Blasting with sodium bicarbonate does not heat the surface, and a high pressure is not required. Hence, blasting with sodium bicarbonate is suitable for renovating classic cars.

  • No trace of blasting;
  • Degreasing surfaces;
  • Excellent paint removal - no component protection required;
  • Removing and slowing mould and germ development;
  • Sodium bicarbonate is biodegradable, non-flammable and water-soluble.

Dry abrasive blasting

Dry blasting is a process of surface treatment without using chemicals, and it is environmentally friendly.  The dry blasting technique of surface treatment involves compressed air and an abrasive medium. Depending on the chosen abrasive medium, dry blasting allows the treatment of different materials, such as glass, wood, plastic, metals, and carbon fibre.

Wet blasting

In the wet blasting technique of surface treatment, compressed air and an abrasive medium is used. The medium then hits the surface with a controlled impact. Wet blasting is often used in explosion hazard environments. It is also used for very sensitive vehicle parts, and in the aviation industry. Polishing and deburring are also possible applications. Media, such as alumina, glass, and ceramics are used for wet blasting.

Possible blasting applications

  • Surface roughening
  • Rust removal
  • Deburring
  • Descaling
  • Paint removal
  • Cleaning
  • Polishing
  • Recovery after a fire
  • Creation of textures by the VOI scale

Blasting usage case studies

See the blasting case studies by clicking on the individual images.

Sandblasting method vs. other methods

The sandblasting method, with its specific characteristics, is a cost-effective and environmentally friendly solution.

 
Cleaning Method Abrazivi Secondary Waste Environmentally Responsible Toxic Electrically Conductive
Dry Ice Cleaning NO NO YES NO NO
Sandblasting YES YES NO * NO
Shot Peening YES YES YES * NO
Laser cleaning NO NO YES * YES
Preasure Washing NO YES NO * YES
Solvents/Chemicals NO YES NO YES N/A
Hand Tools YES NO N/A N/A N/A
* Classic materials absorb impurities, when used to clean hazardous materials and items. These materials are then separated as toxic waste, requiring a special and safe removal. Being aware of the importance of protecting our environment, we have committed to the ISO 14001 environmental certificate.
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