90E Nitric Acid Passivator
The 90E Nitric Acid Passivator accelerates the formation of the Chrome Oxide protective layer on stainless steel after pickling or mechanical finishing. This solution meets the requirements detailed in ASTM A380-13 & A967-13. Although this layer will form naturally when in a good clean air supply it can take anything up to 14 days for complete surface protection.
The solution can be applied by acid resistant brushes, immersion in a bath or by using a chemical resistant spray unit such as the Antox hand operated sprayer.
Application and Procedure
Before commencing work, read the material safety data sheets, in Documents section, observe all safety precautions and use the correct protective equipment.
The 90E passivator is ready to use and is applied undiluted to the dry surface. In an immersion bath it can be diluted 1:1 but reaction times will increase. The reaction time is dependent on the ambient air and the material temperature. The optimal pickling temperature is around 18o – 22o C. Work routines should be avoided in direct sunlight due to the hazard of premature drying.
Neutralise with 10% solution of the alkaline based Mainclean brushed onto the surface, sprayed or dosed through Jet wash then rinse with cold water. This works in three ways, it neutralizes the acid in-situ, stops the contamination of other areas when rinsing and finally ensures that the solution washed off is about ph 7. Although the acids are neutralised local waste water regulations must be observed.
Rust and acid-resistant steels, stainless steels – 20 – 30 minutes
5 kg of 90E passivator is sufficient for approx. 100 – 125 sq. metres of surface area.
General Remarks – 90E passivator contains no hydrochloric acid and no chlorides
Notes on hazards and suggestions for safety precautions
The 90E passivator contains Nitric acid. This is extremely toxic when swallowed. Contact with the skin causes acid burns. Process and store in a well-ventilated place (the cans should be tightly closed). Breathing apparatus should be used when ventilation facilities are insufficient. Appropriate protective goggles; gloves and clothing should be worn whilst working.
Thorough rinsing with water should treat contact with the eyes and thereafter a doctor should be consulted. Contaminated and soaked protective clothing should be immediately changed. A doctor should be consulted if nausea is experienced (the doctor should be shown the notes on safety precautions, the product notes or the product label).
These products should not be accessible to children. For commercial and industrial use only.
Disposal of Waste
Neither the 90E passivator nor the rinsing water may be disposed of in the public sewers in an untreated state. The waste water is acidic and contains metal oxides from the treated metal. Appropriate treatment should be carried out in a suitable neutralisation plant or disposal undertaken via a licensed waste disposal enterprise. The local waste water regulations are to be observed.
This issue replaces all previous issues. The information is provided to the best of our knowledge and conscience and conforms to the laboratory and field experience at the time of going to press. However, it must only be regarded as non-binding guidelines which have to be adapted to requirements. Since the use of our products lies beyond our control, we can only accept liability for the perfect standard quality at the time of delivery. Consequential losses will only be recognised if this was expressly agreed before use in writing, stating the warranted characteristics.