PuroDep - Chemicals for Standard Waste Water Plants
The family of chemicals for standard waste water plants. For heavy and medium TSS water, breaking emulsion capacity. General use in neutralizing section (both Lime or NaOH neutralizer) to help precipitation.
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Applications
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- Phosphating, coagulation, emulsion breaker
- Anodizing, Powder coating lines, chrome free, chromating
- For Z.L.D. (Zero Liquid Discharge)
Related Activities
Passivating
Passivation is, usually, the final operation after coating (Phosphating, Chromating or Chrome free) and before to dry the coat. The scope of passivation is to improve both corrosion resistance and bonding capacity ( in case of final painting) . Passivation baths can be formulated with many chemicals such, Cr +3 , Cr+6 , Ti or Zr oxides , or organic products
Die cleaning
Die Cleaning is the operation to remove Al from dies used for extrusions of aluminium once they become unusable due to build-up of Al within the die. This operation is done in NaOH or KOH solution at 25-30%. Once the aluminium concentration reaches 6-9% the cleaning solution is discarded and a new bath is formulated.
Etching
Etching is a process for aluminium with alkaline chemicals such NaOH or KOH. This operation is the first step of an anodizing line that removes all surface oxides in order to prepare the product for its anodized layer. There is now a recent trend to use acidic etches for lighter etching requirements.
Electrocolouring
After anodizing different colouring finish can be given by Electrocolouring and Immersion in organic dye solutions. This is possible because the anodize coating has microscopic pores that, depending on variables already described, allow aluminium to absorb dyes through immersion. Typically, the darker the color desired, the longer the anodize time is required.
Chemical colouring
Chemical colouring of metals is the process of changing the colour of metal surfaces with different chemical solutions. For Anodizing lines this can be an alternative to Electrocolouring
Alkaline and acid rinses
After any chemical operation, water rinses are used to reduce the risk of introducing unwanted chemicals to subsequent baths. Rinses system may be optimized by using either a 2 or 3 cascading rinse tank configurations in order to maximize rinses quality and minimize consumprion of water.
Hot and Cold Sealing
In the Anodizing industry the final treatment is called ' SEALING' that seals the porous film created from Anodization . This operation is absolutely necessary for Anodizing ss the final step of the process . Sealing can be realized by Hot system or cold system depending on required quality and by Anodizing thickness. Sealing is not necessary if the Anodized Aluminium is sent immediately onto the Painting operation.
Deoiling
Deoiling is an operation to remove oils and fats from the surface before the Alkaline or Acidic Cleaning . This is used in Aluminium Cans, Aluminium and Steel Coil (before pickling or before cleaning) operations.
Activation
In a metal Finishing line, Activation is required prior to Zinc Phosphating operations in order to create germination centers for a good Phosphate crystals growth
Tricationic Phosphating
Is a particular version of Zinc Phosphate process where the addition of Manganese and Nickel improve bonding and corrosion resistance performances. This process is used in Automotive industry where strong corrosion resistance is required.
Nanotechnology Treatments
Is a new technology developed as an alternative to Phosphating where the coating is done by a very thin layer of oxides and organic products that give good performances in terms of bonding and corrosion resistances .
Zinc/Ferrous Phosphating
It is used in most operations where the corrosion resistance of finished product must be especially high, conversion coatings are applied using zinc phosphate . This process is widely used in the automotive industry and in certain sectors of the appliance and electronics industries.
Manganese Phosphating
Manganese phosphates are used both for corrosion resistance and lubricity and are applied only by immersion. Manganese phosphating is used to reduce the friction properties of engine, gear, and power transmission systems. Some examples include screws, nuts and bolts, motor vehicle components in brake and clutch assemblies, casting interiors.
Lubrification
Is a finish that provides reduced friction when applied as Zinc, Calcium or Manganese Phosphate layers.
Electrocoating
Is the electrolytic application of a layer of paint as protection coat against corrosion. There are two system: Anaphoretic or Cataphoretic. The Cataphoretic process is more widely used thanks to its superior corrosion resistance
Treatment processes rinses
Some Nanotechnolgy treatment process require final rinses and some do not.
Amorfous Phosphating
A very popular treatment process is Amorphous Phoshate (called also Iron Phosphate). It is a very thin layer, usually on steel surfaces, by using NaH solution at pH 4-4.5, to improve bonding and addhesion of paint and provided protection against corrosion. Amorphous Phosphate is used ONLY as pretreatment of Paint ( powder, liquid or electrophoretic).
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