Application of Cathodic Protection on the Outer Wall of Acetylene Wet Gas Cabinet Bell Cover

Abstract

In response to the tight maintenance schedule of the acetylene wet gas cabinet bell cover at a chemical plant in Inner Mongolia， the subsequent layers of coating were carried out before the previous coatings had fully cured， leading to defects in the coating itself.After longterm operation， phenomena such as cracking and peeling occurred， and the outer wall of the bell cover became severely rusted， even perforated， posing a significant safety hazard.To control the corrosion of the outer wall of gas cabinet bell cover， the magnesium anode and zinc anode were installed in the fixed area in the early stage， and the corrosion rate was tested by hanging corrosion coupons to get the best anti-corrosion effect of magnesium anode.Based on theoretical calculations and the proper arrangement of anodes in the later stage， construction and installation carried out during the maintenance period， and the cathodic protection effect was tested to meet ≤-0.85 V (vs CSE) after the installation was completed.By combining cathodic protection with existing coatings， corrosion on the outer wall of the bell cover was slowed or suppressed，thereby extending its service life.

Keywords

• cathodic protection； corrosion； wet gas cabinet； clock cover outer wall