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Thursday, March 29, 2007 Creating a 20% Solution Question: How do you generate a 20% concentration of Citrajet for stainless steel passivation? Answer: To make a 20% solution use 200 ml of Citrajet with 800 ml of water to make up a liter, or use 2 gallons of Citrajet with 8 gallons of water to make 10 gallons of 20% solution. (Creating a 20% Solution) Tuesday, March 27, 2007 Stainless Steel Passivation at an Ambient Temperature Question: Is it possible to use Citrajet at ambient temperature (20 deg C) for stainless steel passivation and if so how much time would the process require? Answer: Our typical recommendation for stainless steel passivation is to use 20% Citrajet for 120 minutes at 50 deg C. Since stainless steel passivation follows first order reaction kinetics, in theory decreasing the temperature by 30 deg C, from 50 deg C down to 20 deg C, you would need 8 times as much time, or 960 minutes. In principle, every 10 deg C decrease in temperature from optimal doubles the length of time needed. (Stainless Steel Passivation at an Ambient Temperature)

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