Revision: 2013
Finish: Passivation
Company: ASTM
Application: Chemical Passivation Treatments for Stainless Steel Parts via Nitric or Citric acid
Appearance: Varies
Plate Thickness: Nitric 1 – 20-25% nitric acid, 2.5% weight of sodium dichromate, Nitric 2 – 20-45% nitric acid, Nitric 3 – 20-25% nitric acid, Nitric 4 – 45-5 % nitric acid, Nitric 5 Other combinations of concentration of nitric acid with or without other chemical, including accelerants, inhibitors, or proprietary solutions, capable of producing parts that pass the specified test requirements; Citric 1 – 4-10% weight of citric acid, Citric 2 – 4-10% weight citric acid, Citric 3 – 4-10% weight citric acid, Citric 4 – Other combination of concentration of citric acid, with or without chemicals to enhance cleaning, including accelerants, inhibitors, or proprietary solutions capable of producing parts that pass the specified test requirements., Citric 5 – Other combinations of concentrations of citric acid, with or without other chemicals to enhance cleaning, including accelerants, inhibitors, or proprietary solutions capable of producing parts that pass the specified test requirements. Immersion bath to be controlled at a pH of 1.8-2.2
Strike Thickness: Nitric 1 – 20 mins at 120-130 degrees F, Nitric 2 – 30 mins at 70-90 degree, Nitric 3 – 20 mins at 120-140 degrees F, Nitric 4 – 30 mins at 120-130 degrees F, Nitric 5 – other combination of temperature and time capable of producing parts that pass the specified test requirements; Citric 1 – 4 mins at 140-160 degrees F, Citric 2 – 10 mins at 120-140 degrees F, Citric 3 – 20 mins at 70-120 degrees F, Citric 4 – Other combinations of temperature and time capable of producing parts that pass the specified test requirements, Citric 5 – Other combinations of temperature and time capable of producing parts that pass the specifies test requirements. Immersion bath to be controlled at pH of 1.8-2.2
Notes: per 6.2 and 7.2 - Immediately after removal from the passivating solution the parts shall be thoroughly rinsed, using stagnant, countercurrent, or spray washes singly or in combination, with or without a separate chemical treatment for neutralization of the passivation media (see Section 9), with a final rinse being carried out using water with a maximum total solids content of 200ppm.
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