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topic 2551

Question about phosphate coating



I am a researcher working on plasma nitriding at phophate coated spring wire in Korea. However, I can't achieve nitriding on wire due to phosphate coating.(cating thickness <<1um)

would you recommend me method to remove phosphate coating?

thank you

Jong Kwak
institute of advanced engineering - Korea


Remove phosphate coatings with the following:

5% by weight chromic acid in deionized water.
Temperature = 70 - 75 °C.

Greg Haataja
helicopters - Fort Worth, Texas


Dear Mr KWAK

The advice you get from our peer Mr Greg will passivate the metal and you will not succed to make your plasma coating because of the passivation problem

My suggestion is as follows:

A.Acidic Removal :Every strong inorganic solution removes phosphate coating. you can choose between Phosphoric Acid 10% cold to 40 deg C , or Sulfuric Acid 5-10% solution cold to 40 deg C . Hydrochloric Acid 10% can do the job but not recommended .

The time take for those removal action is 5-10 minute.

B. Alkaline Removal :Your can use solutio consist of 5% Sodium Hydroxide hot at 85-90 °C and after 10 minute the coation will be removed completely . (Be carefull its not convinient solution!)

Yours Sincerely<

yehuda blau
Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel

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