Discussion on the corrosion of pipelines and equipment in electrolytic hydrogen production systems
Thread Content
As title: 1. In hydrogen production electrolysis plants, why is corrosion in the oxygen-side pipelines and equipment much more severe than on the hydrogen side? Operating conditions: Temperature of around 90 degrees Celsius, pressure of 1.5 MPa (gauge pressure) ； Medium: Potassium hydroxide (oxygen on the oxygen side, hydrogen on the hydrogen side). 2. Pipelines are made of 304, 304L, 316, 316L, and 32168; equipment is made of 316 or carbon steel (I can’t remember the specific grade; it seems to be Q345R). Which material is better? 3. We plan to switch to carbon steel pipelines in the near future. It is said that some companies use them and see good results, but according to the corrosion manuals, carbon steel suffers severe corrosion in alkaline solutions at temperatures above 80 degrees Celsius; therefore we are hesitant to use it. I would like to ask those with more experience: have you seen such applications before?
For 316L, alkali pipelines are best made of Ni alloys
I’ll send you the polyaniline hanging slice; there should be no problem
Polyaniline? Are you sure it can be used under these operating conditions? Around 100 degrees and a pressure of over ten kilograms – under such conditions, we generally don’t dare to use organic materials.
A temperature of 100 degrees is no problem, and the pressure can reach 35 MPa; there should be no issues. I’m not sure what the environment is like
I forgot to check the post, so I took another look. I’ve seen the environment; we can cooperate fully and see how to proceed and give it a try