Copper corrosion in circulating water
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The corrosion morphology of the copper coupons in the circulating water system is shown in the figure; the corrosion rate of these coupons exceeds the specified limit, at 0.03 mm/a (the standard value being 0.005 mm/a). The parameters of circulating water, such as phosphate, Cl ions, hardness, alkalinity, and pH, are all within the limits specified by GB. What could be the factors causing excessive copper corrosion? Have you encountered a similar situation? How to improve it? Copper corrosion inhibitor BTA has already been added here. What are the precautions when adding copper corrosion inhibitors? Thank you :)
Copper corrosion is often caused by ammonium ions; it is recommended to test the ammonium ion concentration to determine whether there is an ammonia leak or a source of ammonia gas in the vicinity
:handshake moment
This should have been checked already; the ammonia nitrogen level in the water is less than 1 ppm. It can’t be ammonia that’s causing it
What kind of device is it? Is there a leak in the medium? Substances like ammonia or hexamethylenediamine can corrode copper
It is necessary to measure the pH value to determine whether the water is alkaline and whether this is caused by alkaline substances
I agree with the good point mentioned above and have learned from it. I would like to ask what material that bolt is made of; if it isn’t insulated, what kind of corrosion can occur due to contact between different metals? Additionally: MBT is relatively expensive; it is recommended to carry out a film-forming treatment to create a protective layer of water and iron oxide on the surface. I have many successful cases in this regard.
The bolt is made of polytetrafluoroethylene, a non-metallic material. No galvanic corrosion will occur
Why is there water and iron oxide on the copper hanging pieces?
Refining plant – Circulating water treatment workshop. Water is circulated through all the units in the plant