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AQUUS HOME Arrow LIGHT IRON PHOSPHATE TREATMENTS Arrow MI-PHOS
 

Aquus MI-PHOS: Technical Data

PRODUCT CONC
%
TEMP
°C
METALS FORM APPLICATION DESCRIPTION
Iron Zinc Aluminium Spray Dip
Aquus® MI-PHOS 1.3 40-50 Liquid A single pack lightweight cleaner/coater achieving a coating weight in the range 0.2 - 0.5 g/m2 and benefiting from enhanced surfactant content. Suitable for semi automatic dosing equipment.
Download Technical Data Sheet as PDF
ADDITIVE DESCRIPTION
Aquus® ADDITIVE 532 A sophisticated surfactant formulation suitable for removing lighter soils in plants operating at lower temperatures. Operates at 30 - 40°C

 

Description:
MI-PHOS is a molybdate iron phosphate treatment designed for dip or spray application on steel, aluminium and zinc metals. It will clean the surface and leave an amorphous iron phosphate coating, which inhibits corrosion and improves the adhesion to post applied organic coatings..

Standards:
Conforms to:
BS EN 9717: 2013
Def Stan 03-11/5 Class IV.

Components:
MI-PHOS- Concentrated base material
ADDITIVE 532 - Low temperature surfactant (Optional) for dip application

Testing Requirements:
Phenolphthalein indicator
0.1M Sodium Hydroxide

Health & Safety:
This product is acidic. Click here to request a Health & Safety Data Sheet for safe handling and use.

Equipment:
It is recommended that the tank and fittings are made from stainless steel grade 316S16. This includes the heating elements and any spray nozzles. See a list of suitable equipment.

Process - Dip or Spray:
1. MI-Phos
2.MI-Phos (second stage recommended)
3. Water rinse
4. Passivation (if required)
5. Drying

MI-PHOS will degrease and phosphate in one operation. Pre-cleaning is not necessary unless the work is heavily soiled. If pre-cleaning is required, however, it must be followed by a suitable rinse stage..

Set-up and Testing:

Dip
The starting solution should be prepared by adding 27 litres (33kg) of MI-PHOSto every 1000 litres of clean water. Charge the tank with two thirds capacity of clean water, heat to 45°C and add the MI-PHOS. Finally top up the tank with clean water.

Take a 10 ml sample of working solution, add 3 to 6 drops of phenolphthalein solution and titrate with 0.1N Sodium Hydroxide until the colour changes to permanent pink. Note the volume of 0.1N Sodium Hydroxide used. This is called the “pointage”.

A working solution prepared as above requires 10 ml of 0.1N Sodium Hydroxide and is known as a 10 point solution. To increase the “pointage” by one point add 2.7 litres (3.3 kg) of MI-PHOS per 1000 litres of working solution. Best results are achieved if the tank is tested and adjusted frequently.

Spray

The starting solution should be prepared by adding 13.5 litres (16.5kg) ofMI-PHOS to every 1000 litres of clean water. Charge the tank with two thirds capacity of clean water, heat to 45°C and add theMI-PHOS. Finally top up the tank with clean water.

Take a 10 ml sample of working solution, add 3 to 6 drops of phenolphthalein solution and titrate with 0.1N Sodium Hydroxide until the colour changes to permanent pink. Note the volume of 0.1N Sodium Hydroxide used. This is called the “pointage”.

A working solution prepared as above requires 5 ml of 0.1N Sodium Hydroxide and is known as a 5 point solution. To increase the “pointage” by one point add 2.7 litres (3.3 kg) of MI-PHOS per 1000 litres of working solution. Best results are achieved if the tank is tested and adjusted frequently.

Process:

Dip

Heat the solution to 40-55°C. Immerse the work in the MI-PHOS solution for sufficient time to convert the metal surface to a uniform coating. The time required is usually between 5 to 10 minutes. If a pre-cleaning stage is undertaken, shorter process times of about 3 minutes will be sufficient to generate a satisfactory coating. Normal operation produces coatings in the range 0.2 – 0.5g/m2.

Spray
Heat the solution to 40-50°C. Spray the work with the MI-PHOS solution for sufficient time to convert the metal surface to a uniform coating. For best results a 2 stage process is recommended. The first stage takes 1 minute and the second stage takes 1.5-2 minutes. Alternatively a single stage of about 1.5 to 3.0 minutes should be satisfactory. If a pre-cleaning stage is undertaken, shorter process times of about 1 minute will be sufficient to generate a satisfactory coating. Normal operation produces coatings in the range 0.2 – 0.5g/m2.

Water Rinsing:
Following the MI-PHOS treatment, the work must be rinsed with water. The flow of water through the rinse should be regulated to ensure that the rinse stage does not become excessively contaminated. Testing and control of rinse stages are covered in Technical Bulletin Number 1.

Drying:
Following water rinsing, the work must dried immediately.

General Maintenance:
Automatic equipment can be used to monitor and control the strength of the MI-PHOS working solution. Enviro Tech will, if requested, outline available equipment.

In the course of the MI-PHOS process, sludge is formed as a by-product of the chemical reactions. This sludge settles to the bottom of the tank and should be removed regularly to prevent dusty coatings.

After the solution has been in use for some time, scale will form on the heating elements which must be removed at regular intervals to ensure that adequate heat transfer and proper processing temperatures can be maintained.

The timescale for maintenance depends on the use of the equipment and must be determined from experience.

Effluent:
MI-PHOS solution must not be discharged to main drain without neutralisation and removal of any separated oils and solids material.

Further information

For more information or advice please contact us by telephone on +44(0)20 8281 6370 or email us using our contact form.
Thin Layer Pretreatment Processes are supplied and supported by EnviroTech Europe Ltd.


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