Good question and the short answer is yes, you definitely can. The active passivation of the stainless steel uses the same parameters to passivate the brass parts, which it’s not really passivating them, but it’s cleaning them and brightening them. What I will caution you against is that citric acid removes more of the surface of brass parts than it does of stainless-steel parts in the same amount of time. So, if you are passivating parts getting through several different cycles, then you start to introduce brass. Your bath is going to go quicker, so you’ll have to replace baths more often with brass involved. With that being said, if you’re going to have one passivation line and then a brass line using citric acid, you’re going to have to replace the brass one more often anyways. That’s just something to be aware of.