Passivate

The passivation process removes "free iron" contamination left behind on the surface of the stainless steel from machining and fabricating. These contaminants are potential corrosion sites that result in premature corrosion and ultimately result in deterioration of the component if not removed. In addition, the passivation process facilitates the formation of a thin, transparent oxide film that protects the stainless steel from selective oxidation (corrosion).

Specifications

QQ-P-35&AMS- QQ-P-35
	Type II	Medium temperature nitric acid solution with sodium dichromate additive (20-25% by volume HNO3 with 2.5 +- 0.5% by weight NaCr2O7 processed for 20 minutes @ 120-130 degrees F) for Se, martensitic 400 series, 303, 303, 347Se, 416, 416Se, 430F, 430Fse and precipitatioin hardenable steels
	Type VI	Low temperature nitric acid solution (25-45% by volume HNO3 processed for 30 minutes @ 70-90 degrees F) used for 200 and 300 series chromium nickel and chromium grades with 17% chromium or greater
	Type VII	Medium temperature nitric acid solution (25-25% by volume HNO3 processed for 20 minutes @ 120-140 degrees F) used for austenitic 200 and 300 series chromium-nickel and chromium grades with 17% or greater
	Type VIII	Medium temperature high concentration nitric acid solution (45-55% by volume HNO3 processed for 30 mins @ 120-130 degrees F) used for high carbon and high chromium grades
ASTM A 967
	Nitric 1	20-25% by volume HNO3 with 2.5 +- 0.5% by weight NaCr2O7 processed for a minimum of 20 minutes @ 120-130 degrees F
	Nitric 2	25-45% by volume HNO3 processed for a minumum of 30 minutes @ 70-90 degrees F
	Nitric 3	25-25% by volume HNO3 processed for a minumum of 20 minutes @120-140 degrees F
	Nitric 4	45-55% by volume HNO3 processed for a minimum of 30 mins @120-130 degrees F
	Nitric 5	Other combinations of temperature, time and concentration of nitric acid, with or without other chemicals

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Materials

Copper Alloy (Non Ferrous)
	BeCu
	Brass
	Phosphorous
	TeCu
	Copper
Nickel Alloy (Ferrous)
	Carbon Steel
	Leaded Steel
	Stainless Steel
	Kovar
	Invar
	Nickel
	Spring Steel
	Molybdenum
	Elkonite