Effect verification of ceramic coating crack repair based on penetration method

Abstract Ceramic coating can effectively isolate the dissimilar metal contact between the pipes of the seawater system, block the circuit of the chemical battery, and improve the anti-corrosion performance of the pipes. However, after welding, the ceramic coating at the joint of the pipeline cracks, rendering its anti-corrosion function ineffective and seriously affecting the safety and reliability of the seawater system. Based on the penetration method, the cracked ceramic coating was repaired with ethanol as solvent and polydimethylsiloxane as the active component. The repair effect was verified by dye penetrant inspection, insulation test, and pressure sealing test. The results show that the repair method can fill the cracks effectively. The installation resistance after repair is greater than 1kΩ, which meets the requirements of insulation performance. After repair, the water seepage of the pipeline is zero, which meets the requirement of pressure sealing. This method has practical significance for the further application of ceramic coating in Marine water system corrosion prevention.