Metal Pretreatment Chemicals

ASFOCOAT-DRP is a liquid chemical product used for surface preparation of metals before painting. The objective of treating metals with ASFOCOAT-DRP, before painting is to prolong the life of paints by offering it a “compatible” surface to which it will be locked. ASFOCOAT-DRP removes oils, rust, soils, etc. and forms a phosphate coating integral with metal surface.

 

Pretreating metals with ASFOCOAT-DRP offers the following advantages :-

 

1. Prevents under paint corrosion.

2. Prevents spreading of rust from a damaged area to sound area adjoining it.

3. Increases paint adhesion with metal substrate

4. Prevents paints from peeling or flaking off

5. Enhances durability and life of paints.

 

ASFOCOAT-DRP can be easily applied by swab, brush or dip after dilution with water at room temperature. After 5-10 minutes, the surface is simply wiped dry with a cloth. The surface is now ready to accept any type of paints or primers. ASFOCOAT-DRP can be applied on any ferrous metals. Few applications are on steel furniture such as chairs, tables, cupboards, cabinets, safes, lighting patties, luminaries, printers, copiers, duplicators, computer systems, typewriters boilers, heat exchangers, coolers, air conditioners, slotted angles and various other equipment machineries and fabrications, that are to be painted/or powder coated.

 

ASFOCOAT-DRP is available in 3 standard packings of 6, 12 & 40 Kgs.

 

ASFOCOAT-DRP is manufactured by Ashok Industry since 1960 and is an ISO 9001 Certified Company.

ASFOCOAT-31 removes oil, removes rust and conditions the surface favorable to the adhesion of paint. It does all these three functions simultaneously. It can be used very effectively on all metals, non-metals, alloys, castings, polymers, plastics, rubber parts, polyester screens nylons, including various components, parts and assemblies of the Textile, Engineering and Automobile Industry. It is a versatile general purpose cleaner. It is very safe to use on all metals& Non-metals.

 

1. For Oil Removal: ASFOCOAT-31 has solvents, emulsifiers and detergent properties extremely effective for removing all kinds of oil, fluxes, greases, carbon smuts, rust preventives, dirt, dust & soils.

2. For Rust/Oxide Removal: ASFOCOAT-31 easily removes mild rust as it contains acidic ingredients and special accelerators. It also removes oxidation /oxidized scales of non ferrous metals.

3. Base for Paint: ASFOCOAT-31 produces an extremely fine phosphate coat which acts as an excellent base for the adhesion of paint. ASFOCOAT-31 thus saves five to six separate operations that would otherwise be necessary for preparing the metal surface prior to painting. It can be used on all ferrous components, M.S. sheets and castings.

4. In a one step operation it also effectively cleans and conditions aluminium surfaces for painting.

5. It is also widely used for cleaning of all metals & non- metals.

 

METHOD OF APPLICATION:

 

1. By Hand: ASFOCOAT-31 is ideally applied by swabbing or by brushing. The concentration to be used would depend on the extent of the soils to be removed. The solution is swabbed & allowed to stay for 3 to 5 minutes after which it is cleaned with saw dust or a dry cloth, before the surface dries.

ASFOCOAT-31 may be used directly or diluted upto 10 times with water depending on the type of metals and amount of contamination.

 

1. By Dipping: For small to moderate sized parts it may be used by immersion in a tank made of SS 316 or in a MS tank lined with PVC, PP, FRP or in a Plastic tank. The parts should then be rinsed and dried by hot air or wiped dry immediately. Following process parameters may be followed depending on metal and soil contamination.

SAFETY PRECAUTIONS:

 

1. Persons handling ASFOCOAT-31 should wear PVC/Rubber gloves.

2. If it falls on eyes or skin it should be washed off with plenty of fresh water.

 

PACKINGS: 5 Kgs., 10 Kgs. & 35 Kgs.

The ASFOCOAT-K process operated at room temperature produces a fine grain smooth and continuous Zinc Phosphate conversion coating for pre-paint treatment of steel. Applied by dip, it protects the base metal against corrosion and bonds supplementary coatings firmly to the surface.  The chemically converted phosphate coating provides an excellent foundation for the lasting adhesion of paint.

PROCESS:

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Sr. No	Stage	Chemical	Concentration	Temperature	Time (minutes)	Tank
1	Degrease	ASFOCLEAN-B	5 - 10% (w/v)	R.T. - 70?C	10/20/10	*M.S./Plastic
2	Rinse	WATER	-	R.T.	1	M.S./Plastic
3	Derust	SCALGUN / RUST SOLVENT	15% - 25% (v/v)	R.T.	10/30/10	Plastic or FRP lined M.S.
4	Rinse	WATER	-	R.T.	1	M.S./Plastic
5	Activate	ASHPREP (Optional)	0.5% (w/v)	R.T.	1	M.S./Plastic
6	Phosphate + Additive	ASFOCOAT-K + ACCELERATOR	4% - 6% (v/v) 0.2%-0.3% (w/v)	R.T.	15 - 30	“
7	Rinse	WATER	-	R.T.	1	“
8	Passivate	ASFOFIX-A	0.025% (v/v)	R.T. - 70?C	1	*M.S./Plastic
9	Dry-off immediately with help of hot air blower or compressed air under a fan.

Notes :

• While preparing any bath, always add chemical to water.
• While preparing phosphating bath, first add the required amount of chemical to water and then add ACCELERATOR as  stated below. 
• ACCELERATOR should always be dissolved separately in a small quantity of water and this solution is then sprinkled uniformly in the Phosphating bath.
• False bottom should be provided in each tank to avoid parts from touching the bottom and to maintain bath free from sludge interference.
• Phosphating bath should be decanted periodically to remove sludge settled at the bottom of the tank.
• Manual swabbing with the degreasing solution is advisable for heavy oily contamination.
• The quality and uniformity of the phosphate coating is directly dependent on the pre-treatment prior to phosphating.  It is essential that the parts are absolutely free of oil, rust, dust,scales and other contaminants before immersing in the phosphating bath.
• pH of passivating bath should be maintained between 3 & 5. Passivating bath should be discarded periodically and made fresh.
• Additions to all chemical tanks should be made daily and regularly to obtain consistently  uniform results.All rinse water baths should be made fresh at least twice a week.
• Activation with ASHPREP at 0.5% produces a compact dense zinc phosphate coating.

ASFOCOAT-ZX process is operated at higher temperature by dipping method to produce a smooth and continuous fine grain Zinc Phosphate conversion coating. This coating improves adhesion between paints and steel and also protects steel from under-paint corrosion thus enhancing life and durability of paints.

USES:

ASFOCOAT-ZX process is used on all steel surfaces which are to be painted or powder coated.  It is also used on ground and machined components etc. to produce medium to heavy weight zinc phosphate coating which is then sealed with rust preventive such as ASFOSIL DW-56.  This process is ideally suited to produce dark grey to black phosphate coating on nut bolts and fasteners.
 
PROCESS:

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Sr. No	Stage	Chemical	Concentration	Temperature	Time (minutes)
1	Degrease	STRIPPER-HD	5% - 10% (w/v)	95°C	10/15/10
2	Rinse	WATER	-	R.T.	1
3	Derust	SCALGUN or RUST SOLVENT	33%-50% (v/v)	R.T.	5 - 20
4	Rinse	WATER	-	R.T.	1
5	Phosphate	ASFOCOAT-ZX	A : 8% (v/v) } B : 6% (v/v) } C : 4% (v/v) }	90° - 95°C 75° - 85°C	4 - 8 10-15
6	Rinse	WATER	-	R.T.	1
7	Passivate	ASFOFIX –A	0.025%-0.05% (v/v)	70ºC	1
8	Dry-off with help of hot air blower or compressed air or in oven.

Notes :

• Tanks for Stage 1, 5 & 7 -  M.S. Tank with S.S. heaters Stage  3 & 4 -  Plastic Tanks or PVC/FRP lines M.S. Tank  Stage  2  & 6    -  M.S. or Plastic Tank.
• Heating in tanks 1, 5 & 7 should only be done from the sides of the tank and not from the bottom.
• Heavily contaminated sheets and parts must be dipped/swabbed with kerosene or degreasing bath solution before dipping in the degreasing bath.
• In most continuous processes it is necessary to have a hot spray knock-off with ASFOCLEAN-SP prior to degreasing or have two dip degreasing stages using STRIPPER-HD.

SEALING:

Phosphated parts which are not to be painted should be dipped in ASFOSIL-DW56 for long term protection against corrosion.

SAFETY PRECAUTIONS:

• PVC/Rubber  gloves, aprons and eyeshields should be worn while handling  chemicals.
• Splashes or splatters on eyes or skin should be washed off with plenty  of fresh  water.

PACKING:  7 Kgs, 15 Kgs & 45 Kgs. Polythene Carboys. 

Phosphate treatment of metals or Phosphating, as it is commonly termed in the metal finishing industry has been acclaimed as one of the most useful and effective method for the protection of iron and steel surfaces from atmospheric corrosion. It is manganese phosphating chemicals. Apart from its anti-rust character, the coating provides an ideal base for an organic finish and as an aid to lubrication.  It also prevents wear in sliding or frictional parts.  The coating provides myriads of oil reservoirs effective in reducing friction.  .

PERFORMANCE:
 
ASFOCOAT-MN is of Manganese Phosphate type and mainly used for producing corrosion resistant phosphate coating as well as lubricating and wear resistant surface under a dip type system.  It produces dark grey coatings of the order of .002 mm for light coatings and .005 mm or more for heavy coatings weighing from 800 mgs per sq.ft. of surface area, to higher than 2,000 mgs per sq.ft. as per desired specifications to meet class A1 coating under I.S. 3618.

APPLICATION:

Piston Rings, Rocker Arms, Gears, Valves, Tappets, Cylinder Lines, Camshafts, Nuts & Bolts, Small Arms and Defence Equipments and other machinery spare parts are frequently phosphated to increase life, by reducing Wear and Friction.

PROCESS:

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Sr.No	Stage	Chemical	Concentration	Temperature	Time (minutes)
1	Degrease	ASFOCLEAN-AD10	10% (v/v)	60ºC - 95ºC	10/15/10
2	Rinse	WATER	-	R.T.	1
3	Phosphate	ASFOCOAT-MN	A : 8% (v/v) B : 5% (v/v) C : 3% (v/v)	95ºC	* 10–20
4	Rinse	WATER	-	R.T.	1
5	Rinse	WATER	-	60ºC - 80ºC	1
6	Dry-off by blowing air or compressed air on in an oven.
7	Sealing	ASFOSIL-DW56		R.T.	2

Notes :

1)Tanks for     Stage 1, 3 & 5  :  M.S. Tank with S.S. heaters.
Stage 2, 4 & 7     :   M.S. or Plastic Tank.

2)Heating in tanks 1,3, 5 should only be done from the sides of the tank and not from the bottom.

3)False bottom should be provided in each tank to avoid parts from touching the bottom and to maintain bath free from sludge interference.

4)Heavily contaminated sheets and parts must be dipped/swabbed with kerosene or degreasing bath solution before dipping in the degreasing bath.

5)To make initial bath, the tanks should be half filled with water and then the required chemical added.  Extra water as required should then be added to achieve the working level.

6)Aging of the phosphating bath should be done initially by adding steel wool at 1 gm/litre of bath to build iron content in bath.

7)Phosphating bath should be decanted periodically to remove sludge settled at the bottom of the tank.

8)The quality and uniformity of the Phosphate coating is directly dependent on the pre-treatment prior to phosphating.  It is essential that the parts are absolutely free of oil, rust, dust, scales and other contaminants before immersing in the phosphating bath.

9)Skum & oil floating on any of the tanks should be removed immediately.

10)Additions to all chemical tanks should be made daily and regularly to obtain consistently uniform results.

11)All rinse water baths should be made fresh at least twice a week.

Ashok Industry an ISO 9001 Certified Company manufactures various Metal pre-treatment Chemicals since 1960 and offers a simple 4-stage chemical process for pre-treating Aluminium Surfaces prior to powder coating or liquid painting.

Stage 1 involves cleaning with 2% - 5% solution of SCALGUN-A with water at room temperature for 3 – 5 minutes. Stage 2 – Water Rinsing.

 

Stage 3 involves Chromatising with 1 - 3% solution of ASHCROM-G70 with water at room temperature for 3 – 5 minutes.

 

Stage 4 – Water Rinsing and Air Drying.

 

Following the above simple process gives excellent paint bonding/adhesion of powder coats to the base surface. It also gives excellent corrosion protection.

ASHCROM-EL - a chemical product manufactured by Ashok Industry is used for getting chromate conversion coatings on Aluminium.

Depending on Aluminium composition and process the colour obtained varies from iridescent to olive green. ASHCROM-EL has the ability to cover up scratches and other blemishes while giving a decorative finish at the same time.

 

ASHCROM-EL is widely used on Aluminium components used in the electronic industry as it serves as a final finish with good anti-corrosion and non-conductive properties. It is also used before painting or powder coating to enhance paint bonding and corrosion-resistance.

 

ASHCROM-EL is supplied in concentrated form which is to be diluted with water for actual use. The process is simple and economical. It is available in standard packings of 6 and 35 kgs.

ASFOCOAT-RP is a unique chemical product used for producing a phosphate coating on iron and steel parts having oily surfaces. No separate degreasing is required. The phosphate coating produced provides an excellent base for paints and powder coatings. ASFOCOAT-RP process is very simple, most economical and easy to operate and maintain.

 

USES :

 

ASFOCOAT-RP can be used on all fresh iron and steel parts having light to medium oil contamination. For rusted or heavily greased parts, prior cleaning in SCALGUN-B is necessary. It is also suited for iron and steel parts which are to be bonded with rubber.

 

PREPARATION OF BATH SOLUTION :

 

Prepare a 10-15% (v/v) solution of ASFOCOAT-RP with water in a plastic tank, add 1% ASHPLUS-101 (Additive) and mix well. This solution is ready for use now.

 

APPLICATION:

 

1. FOR NON-RUSTY PANELS/COMPONENTS:

 

1. BY WIPING:

 

Using a cloth, wipe this bath solution liberally on sheet metal parts or components, wiping every part thoroughly well. For superior coating, an immediate second wiping application will give excellent results. Leave the panels in a vertical position to dry. No rinsing with water or wiping with cloth are necessary.

 

1. BY DIPPING:

 

Dip parts for 10-20 minutes in the above bath solution and before removing them, wipe them thoroughly well with the same solution. Then allow the parts to dry in air.

 

1. BY SPRAY:

Spray the above bath solution on parts at a spray pressure of 5-10 kg/cm² for about 1-2 minutes. Then allow the parts to dry in air

 

1. FOR RUSTED & HEAVILY CONTAMINATED PANELS/PARTS:

 

Heavy contamination or light to medium rust should be first removed by dipping them in a 15-25% solution of SCALGUN-B in a plastic tank. Then rinse them in water and do any of the above application for Non-Rusty panels/components.

( P.T.O.)

 

NOTE:

 

If coating colour/shade reduces add about 0.1% ASHPLUS-101 periodically. Also maintain bath concentration.

ASFOCOAT-160 alongwith ASFOCLEAN-140 additive is widely used for pre-treatment of M.S. Drums and Barrels for cleaning cum phosphating by spray process prior to painting. Iron phosphating chemical. Its cleaning cum spray phosphating

 

Surfaces treated with ASFOCOAT-160 gives good bonding to paints and also prevents under paint corrosion. Further spreading of rust is restricted to damaged portion only.

 

Ashok Industry manufactures a wide range of metal pre-treatment chemicals since 1960 and is an ISO 9001-2008 Certified Company