The passivation treatment of stainless steel

The passivation treatment of stainless steel(Passivation treatment)

Micro-Giant BioEngineering 2003.10.24

1. Austenitic stainless steel passivation treatment:
  1. All 300 series chrome-nickel stainless steel can be used, except for only 303 and 303 Se.20 ~ 40% HNO3 (capacity), a temperature of 130 to 160 ° F, 30 to 60 minutes.
  2. Exclusively for the 303 and 303 Se use 20% HNO3 (capacity) of sodium dichromate (weight) plus 2%, temperature 110 ~ 130 ° F, 30 minutes. Removed after cleaning, are used for the following processing. Immersed in 140 to 160 ° F, 5% (by weight) solution of sodium dichromate, 1 hour, taken out, completely washed in hot water, and dried.
2. Ferrite stainless steel passivation:
  1. 430,442 and 446 using 20 ~ 40%
    HNO3 (capacity), a temperature of 130 to 160 ° F, 30 to 60 minutes of time.
  2. 405,430 F, and 430F Se using 20 ~ 40% HNO3 (capacity), a temperature of 110 to 130 ° F, time 30 to 60 minutes.
  3. The highly polished 405,430,442 and 446 using 50% HNO3 (capacity), the temperature of 90 ~ 100 ° F, 30 to 60 minutes of time. After removing completely in hot water washed, and dried.
3. Matian race stainless steel passivation:
  1. 403,410,414,420,431,440 A, 440B and 440C of the use of immersion at room temperature, 70% HNO3 (capacity) for 30 to 60 minutes, or immersed in the 70 to 112 ° F, 20 to 30% HNO3 (capacity meter)plus 2% (by weight) sodium dichromate or dichromate solution of potassium, 15 to 30 minutes. After removing washed in hot water and dried.
  2. 16dedicatedimmersedina15%(capacity)nitrate,per 10President - elect1-1/2poundssulfuriccavernsolution,atemperatureof110to125 °F,thetime15 to 30 minutesafter removing thewashed and driedin hot waterof.
  3. Allstainlesssteelmartensiteracecan be usedimmersedina120to130 °F,50%(capacity meter) HNO3,for 5 minutes.After removingwashedin hot waterand dried.Note:Thisrapidprocessingmethod,various types ofstainless steelcan be used,there is noetching(etching)concerns.

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