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Ferroxyl Test Kit for free IRON passivation

Available Packing Sizes: 

Full complete set. Also you can order separately TK F1 and TK F2

This test kist is specially designed to test of PICKLED staineless steel or to test of presence of embedded iron in the steel surface .
Use the “ferroxyl test.” Spray the surface with a solution of potassium ferricyanide. If free iron is present, a blue color will appear. This test is extremely sensitive and often gives false positive results, that is, it gives an indication of iron being present when it really is not. The ferroxyl solution must be made fresh each day.

Both the copper sulfate and the ferroxyl tests are described in ASTM A380.

It is a very highly sensitive & hazardous test and should be used only when traces of free iron or iron oxide is "objectionable". Personnel familiar with its limitations and hazards should only be permitted to use this test method.

The test is based on a reaction of potassium ferricyandide with iron in a strongly acid medium. The excess iron dissolves in this strongly acid medium as ferrous ion to form a blue complex, known as Prussian Blue. When during this test this blue coloration manifests itself it means that the surface of the stainless steel does not yet have the correct structure and has been insufficiently pickled. When the blue coloration does not appear this means that the structure has been restored and indicates that the surface has been satisfactorily pickled.


After getting positive result Remove free iron and free iron oxides by using for example,  a phosphoric acid solution or  Citric acid. 

Product Application: 

It consists of two solutions, TK-F1 & TK-F2,

Mix Solution TK-F1 & TK-F2  1:1.  ( which contain nitric acid and potassium ferricyanide. The potassium ferricyanide can emit lethal fumes if it is exposed to concentrated acids, or heated to decomposition. The mixed solutions are combined before use as the mixture has an active shelf-life of approximately 24 hours. )

1st option ::: A filter paper is soaked with the mix solution and applied to the surface to be checked. After a reaction time of 30 - 60 seconds, ferrite residues, which are on the surface, will give a blue result if  when iron is present.

2nd option ::: Alternatively, this mixture can be sprayed by atomizer spray over the area to be tested , and inhalation of this spray should be avoided.
Important note :

- The tested surface has to be cleaned immediately after with de-ionised water.
- Highly trained personnel should only be permitted to perform this test.
- Residues of pickling products will also show a blue colour.

Product Dose: 

The Ferroxyl test is designed to determine whether austenitic stainless steel needs to be pickled or whether it has been pickled satisfactorily. When structure on the surface of austenitic stainless steel has not been evenly restored, an excess of metallic iron will be present (so called embedded iron) which will adversely affect the properties of the stainless steel.

The presence of embedded iron in the stainless steel surface disturbs the chromium oxide film reducing the corrosion resistance locally. When embedded iron is not removed serious (pit) corrosion may set in.

Experimental Principle  ::: --- 

The test is based on a reaction of potassium ferricyandide with iron in a strongly acid medium. The excess iron dissolves in this strongly acid medium as ferrous ion to form a blue complex, known as Prussian Blue.

When during this test this blue coloration manifests itself it means that the surface of the stainless steel does not yet have the correct structure and has been insufficiently picked.


Also refer this link ::: Palladium Chloride Passivation Test Kit  (

                                 Passivity Test Kit for PASSIVATION  ( )

Product Note: 

It is not recommended for use on products destined for use in food, medical or pharmaceutical unless complete removal of the cyanide solution can be guaranteed.
An alternative is our Passivity test kit which will give a red/pink result when in contact with Iron. The chemicals used in the passivity test are not hazardous.

Carbon steel will only contaminate the stainless steel if the passive layer of chromium is destroyed. Very few fabricators have the capability to fabricate in an operating room environment. There are many ways to remove free iron and free iron oxides by using for example, RXSOL-16-1011-025 solution.

A ferroxyl test is a test done only to "detect" contamination. Once contamination is detected, then a removal procedure is carried out.

Product Technical Specification: 

Content of Rxsol Ferroxyl  Test Kit –

Equipment  & Reagent :

  • Latex Gloves – 1 Pkt.
  • Shoes Cover – 1 Pkt.
  • Test Tube 100 ml – 1 Pc.
  • Test Tube 25 ml – 1 pc. 
  • Filter Paper – 1 pkt ( 0/11 (cm)
  • Squeeze Bottle – 1 pc ( Transparent dropping bottle 25 ml )
  • Reagent TK-F1 – 50 ml x 2 Nos
  • Reagent TK-F2 – 50 ml X 2 Nos
  • D.I. Water (Lab Grade) –  1 Btl
  • Measuring scoop

The principle of Ferroxyl test kit :

Free iron cannot be seen on the surfaces of contaminated parts. Therefore, it must be converted into a visible form.   

Ferroxyl Test Kit helps to Identify transition Iron metal ions to blue colour spot. 

The transition of Iron metals to form blue coloured compounds with TK F1 and TK F2. 

colourless solution → blue precipitate  


Removal of IRON OXIDE RESIDUE from the stainless steel surface

Pickling Method to result Passive film – 
As per guideline of  ASTM A380, solution D.Take Nitric Acid 6 - 25%  and ½ - 8% HydroFluoric Acid in fresh water. And gives hot treatment at 28 - 60 degrees C for about 30 minutes.  Before uses of this strong acidic cleaning solution always take spot trial on steel surface as an acidic solution may etch highly finished steel surfaces. 

Good Pickling on surface helps Stainless steel to self-passivates on exposure to air and may accelerate the formation of the passive film or form a thicker passive film.

Metal Chemical Cleaning – Metal Clean Bright, citrus-based cleaners also help to remove free iron contamination. Where highly finished steel surfaces matters this chemicals cleaning can be used freely. 
Electropolishing – Like machining and grinding, this process removes the surface of the part, including any embedded iron. 

Ferroxyl Test Kit for free IRON passivation manufacturer supplier distributor in Mumbai, Kandla, Kolkata, Vizag, Chennai, India, Fujairah, Dubai UAE, Muscat Oman, Kenya Africa. Get the best quality of Ferroxyl Test Kit for free IRON passivation at a competitive price from us. We have ready stock of Ferroxyl Test Kit for free IRON passivation in India, UAE Gulf, Oman, Kenya Africa. Contact us for bulk as well as small orders.

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We are one of largest marine chemical manufacturing company in Asia. Our specialization in marine, oil field, shipping industry. Since 1995 our group team continiously developing our product to achieve best in quality and services. Specially in shipping industries we make our position on TOP among all supplier. All shipchandler and shipping company of UAE - Middle East are well known to us and DUBI CHEM Marine International have more then 1800 global regular client to achieve our monthly target more then 360 MT .   DUBI Chem Marine International have very strong distribution network as well in INDIA also to complete supply directly on ship vessel - (Kandla,Mundra,Sikka) , (Mumbai,JNPT,Goa,Manglore) , (Vizag-Visakhapatnam,Gangavaram) , (Chennai,Ennore,Kochin) , ( Kolkata, Haldia, Paradip ) etc... For INDIA supply directly mail us on or feel free to call us 0091-9821214367 ...

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