NaOH Corroding Metals

  • Thread starter mrjeffy321
  • Start date
mrjeffy321
Science Advisor
875
0

Main Question or Discussion Point

Without getting into too much detail on what I am building, here is what I am basically asking,
Will Soidum Hydroxide (NaOH) corrode brass?
I am thinking yes. Bras is made up of zinc (which I know NaOH will corrode) and copper (I am not sure about copper).
Basically, I have a value, made mostly from brass, that I want to use to control the flow of something which will be in VERY Close proximity to a concentrated solution of NaOH. The valve probably has some steel in it too I am guessing.

So what metals are out, obviously Aluminum, Zinc, ...?
Are any metals "in"?

I would probably be better going with a PVC valve, right? But I dont think they are as high a quality as the metal ones, plus I want[ed] to connect the value to a brass hose barb adapter to connect to a plastic tube. I guess I could go PVC all the way.

Any thoughts?
 

Answers and Replies

mrjeffy321
Science Advisor
875
0
OK, what I ended up doing is trading in all my brass parts for plastic (they call it nylon I think), except for 1 part which I looked and looked and couldn’t find a plastic equivalent for, but this one is either copper or brass, so lets hope it can take it.

EDIT:
Do you want to know how much of a nerd I am?
Since it didnt say anywhere whether the metal part I bought was brass or any other metal, and since it looked esspecially shiny and copper like, I decided to test it. So, as all of you know, the most fun way to test what kind of metal something is on a Friday night is of course, find its density.
Not having a very accurate way to measure volume besides water displacement and that fact that theoretically water weighs 1 g/cc, I found the part to have a density of about 5.5 g/cc, and that is rounding up slitly to make up for the inaccurate volume measurement.
I looked up the densities of Copper, Zinc, and Brass,
Cu = 8.92 g/cc
Zn = 7.14 g/cc
Brass = about 8.9 g/cc

So, I found out, assuming my measurements can be taken seriously, that it is made out of none of the above, or atleast is alloyed with a much lighter metal (hopefully now aluminum).
 
Last edited:

Related Threads for: NaOH Corroding Metals

  • Last Post
Replies
23
Views
24K
  • Last Post
Replies
13
Views
10K
  • Last Post
Replies
7
Views
907
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
3
Views
3K
Replies
4
Views
24K
  • Last Post
Replies
1
Views
1K
Top