Abstract: In recent years, with the increasing loading and unloading frequency of reforming feedstock and naphtha at the terminal, leakage incidents of metal hoses have become more frequent and pitting corrosion is the predominant corrosion form. According to incomplete statistics, leakage of metal hoses at the terminal has exceeded 10 times in the past five years. This poses a significant safety hazard to production activities in riverside areas. Through on-site judgment and experimental data analysis, it is concluded that the accumulation of Cl- in the troughs of metal hoses leads to an increase in concentration, which is the main cause of corrosion. Through on-site analysis, electrochemical experiments and coupon tests, it is verified that the increase in Cl- concentration causes the corrosion failure of metal hoses and the corrosion mainly occurs in the troughs of metal hoses. Based on the experimental data analysis, anti-corrosion measures for metal hoses and methods to extend their service life are proposed.

Key words: electrochemical corrosion, metal hoses, pitting corrosion, anti-corrosion