Rochem Passivating Liquid

Liquid for passivating austenitic stainless steel • Rochem Passivating Liquid is based on nitric acid and non-ionic surface active substances. • The product provides austenitic stainless steel with a protective oxide layer after it has been pickled. The metal is then passive. • Rochem Passivating Liquid, undiluted, is suitable for use only on austenitic stainless steel. 

 

Application Rochem Passivating Liquid is used mainly for the passivation of pickled installations and tanks. It can be applied in the following ways: 1. by circulation 2. by spraying 

 

Direction for use General A passivating treatment with Rochem Passivating Liquid can only take place if the steel has been pickled previously (i.e. treated with Rochem Pickling Liquid). Circulation method This method is applied mainly in pipe systems. Fill the system with undiluted cold Rochem Passivating Liquid. The time taken for treatment is approx. 2 hours. Drain the system and rinse thoroughly with demineralized water.  N.B. Before disposing the passivating fluid it should be neutralised. For this use slaked lime. Spraying This method is generally used in tanks with a tank washing device which is resistant to our product Rochem Passivating Liquid. The Passivating Liquid fluid is sprayed undiluted using a spraytime of approx. 15 minutes. After this rinse thoroughly with plenty of water using, preferably, demineralised.  

 

Properties Strong acidic product. Contains nitric acid. Fully miscible with water. Undiluted it is suitable for use only on austenitic stainless steel. When diluted it is suitable for cleaning aluminium. Specific gravity (at 20°C) : approx. 1.1 kg/ltr. Flashpoint c.c. : none pH (1% solution) : approx. 1.0