CitriSurf® 8050

stainless steel passivation

Technical Data:


CitriSurf 8050 is a high quality blend of chemicals formulated for the derouging, descaling, and passivation of stainless steel products. CitriSurf 8050 is specifically designed to provide low cost and efficient removal of all iron oxides and free iron from the surface of stainless steel, providing the highest chrome oxide levels possible.

Physical Properties:

Specific Gravity
Approx. wt. /gallon
Chemical Composition
Operating Temperature
Flash Point
Water solubility
Normal working concentration
pH at working concentration
10.0 lb/gal
5 cps
Citric acid, Phosphoric acid, water, proprietary ingredients
Room temp or higher (120-160°F preferred)
25% by volume in water
approx. 1.0


5 gallon or 55 gallon plastic containers. Larger sizes available upon request.

Application Procedure:

To assure best results, the parts to be passivated should be thoroughly cleaned with an appropriate cleaning solution prior to treatment with CitriSurf solution.

All equipment, mixers, tanks and pumps should be clean and dry prior to mixing of CitriSurf solution. CitriSurf 8050 should be mixed with clean water (deionized or distilled water if desired)Metal Passivation at a ratio of 1 part of CitriSurf 8050 with 3 parts of water by volume to fill the tank or pipe system used so as to adequately cover all parts and surfaces to be treated. Polypropylene, stainless steel, or equivalents should be used for construction of all tanks and devices used in the CitriSurf bath. Agitation of the solution in the tank is recommended to attain optimum results. Optimum results can be obtained by using this product in an ultrasonic tank. Optimum results can be obtained with many parts by using CitriSurf in an ultrasonic tank.

Heat the solution for optimum performance. Teflon coated (or equivalent), stainless steel or titanium heating devices are recommended. Your tests should indicate the best bath working temperature for the products you manufacture. 120-160°F is typical. Room temperature could be adequate depending on the end use.

Completely immerse the parts to be passivated in the solution for a period sufficient to remove all rouging, iron oxide and free iron from the surface. This is typically 20-30 minutes, depending on temperature, grade of stainless steel, hardness, use of ultrasonics, and the condition of the surface of the parts. This should be determined by testing with your product. For pipe systems, the CitriSurf solution should be circulated through the piping for the entire time of passivation, if possible.

Rinse thoroughly with clean water and dry completely in air immediately. Drying can be accelerated by use of a hot air oven or other drying medium to attain a highly passive surface.

Notes on Use:

CitriSurf 8050 is a Phosphoric Acid and Citric Acid based material, and as such it may cause irritation to exposed surfaces of the body. See Material Safety Data Sheet before using this material.


Replenish the bath with CitriSurf and water as appropriate to compensate for dragout, evaporation, and acid consumption. The pH of the CitriSurf 8050 passivation bath should be held to within +0.1 of its initial value for normal operation.


Dispose of according to all federal, state and local regulations.


CitriSurf 8050 should be stored at temperatures between 50°F and 120°F in 316 stainless steel or approved plastic containers (polyethylene or polypropylene). (If accidentally frozen, thawing will return product to normal.)

Technical Services:

For technical assistance, please contact Stellar Solutions at (847) 854-2800.


CitriSurf 8050 meets all of the requirements of the ASTM A967, ASTM A380, ASTM B600, and AMS 2700 standards.

Testing of your products with CitriSurf before using in production is recommended. Every product and production facility is different, and requires testing to ensure that CitriSurf is compatible with the particular situation. No warranty is implied, or may be given in writing or verbally without the written permission of Stellar Solutions, Inc.


Nonfood Compounds
Program Listed A3