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Pre-treatment process

The company follows 8 tank processes for all its steel components. This process makes the aesthetics and strength of the steel components long lasting, with varying weather conditions (internal or external). Listed below are the various processes followed.

Tanks Pre Treatment Process

DEGREASING: Room Temperature Process, Duration-30-40 Minutes, For-Cleaning the Sheet Metal Surface of grease, oils, soils, lubricants, oxide films, Heat Treatment/welding Scales etc. by ALKALINE DEGREASER.

WATER RINSE-I Rinsing Process is Carried out.

DERUSTING Room Temperature Process, Duration-20 Minutes, For-Cleaning The Sheet Metal Surface of Rust by Mixed HYDROCHLORIC ACID.

WATER RINSE-II Rinsing Process is Carried out.

SURFACE ACTIVATION Room Temperature Process, Duration-20 Minutes, For-Activating the Sheet Metal Surface for Zn & Mn phosphate Coating by ACTIVATION CHEMICALS

PHOSPHATING Room Temperature Process, Duration-5-20 Minutes, For-Smooth & Uniform Coating of Sheet Metal Surface with Zn Phosphate by ZINC PHOSPHATE SOLUTION

WATER RINSE-III Rinsing Process is Carried out.

PASSIVATION Room Temperature Process, Duration-15-20 Minutes, For-Sealing Pores of Sheet Metal Surface for obtaining Maximum Corrosion Resistance over Phosphate Coating by DECXYLITE SOLUTION

Sand Blasting Process

Sand Blasting Process

Bakes up to 230 deg. C after powder coating

The process - individual pretreatment of all materials

Golconda Energy also houses sand blasting unit for metal cleaning process and hot flame spray for aluminium & zinc spray to meet specific customer’s requirements.

Sand blasting resultSand blasting result Prior to powder coating, painting or spray galvanization, metals require to be sand blasted according to their surface condition. The use of diverse blasting materials creates various surface results.

Various substrate surfaces and blasting material create convincing effects and solutions. Laengle has the experience to meet your needs.

Zinc Shot Blasting

Zinc shot blasting is shot blast cleaning using zinc shot pellets to prepare or modify the surface

Shot blast cleaning is a method of abrasive blast cleaning. Small metal shot acts as an abrasive media for surface preparation. Shot blast cleaning forcefully propels a high-pressure stream of abrasive material (metal shot) against a surface to:

  • Smooth a rough surface
  • Shape a surface
  • Remove surface contaminants such as rust
  • Remove paints or coatings

  • powder coating

    Powder coating is an advanced method of applying a decorative and protective finish to a wide range of materials and products that are used by both industries and consumers. The powder used for the process is a mixture of finely ground particles of pigment and resin, which is sprayed onto a surface to be coated. The charged powder particles adhere to the electrically grounded surfaces until heated and fused into a smooth coating in a curing oven. The result is a uniform, durable, high-quality, and attractive finish.


    Pretreatment means surface preparation.

    Here by pretreatment, we mean metal pretreatment as the powder coating is predominantly applied to metals.

    Surface preparation includes:

    a) Cleaning – mechanical or chemical

    Mechanical cleaning includes methods like scratch brushing and sand blasting. This by abrasive action not only removes the surface impurities but also eliminates scratches and surface irregularities. Cleaning is very good, however, coating must be done immediately because the cleaned surface is in a highly reactive state and corrosion occurs very soon.

    Chemical cleaning includes removal of dirt, oil and grease, and the oxidation products present on the surface by means of chemicals. The chemicals may be applied by wiping, spraying or dipping. The nature of chemicals used depends upon the base metal and will be discussed later in detail.

    b) Application of conversion coating.

    Conversion coating. – These are applied for three purposes: 1) provide temporary in process corrosion protection before application of powder coating. 2) promote good adhesion of the powder coating to the substrate. 3) impart under paint corrosion & thereby improve the life of the powder coating. The type of the conversion coating used also depends upon the base metal and will be discussed later.

    Baking Oven

    Oven can be used for water drying or paint baking or powder curing. For water drying normally oven inside temp is set to 110oC. For paint baking normally oven inside temp set in between 120 to 140oC. or powder curing normally oven inside temp set in between 180 to 220oC. Working - Air passes over hot heat exchanger (tube & shell type) & gets heated. Hot air is supplied thro duct & flow can be adjusted by adjusting dampers. Dampers are fitted in oven at bottom thro out the length sidewise. Hot air already supplied in oven, recalculates thro suction duct to heater box. So the time required to heat-up recirculated air is less than heating fresh air.

    cooling area

    Post painting to ensure the micron guage level for quality maintain and standards.