During underwater inspection, pitting corrosion was observed on various weld joints of offshore structure jackets. For this purpose, during underwater inspection surveys cathodic protection potentials were measured at different locations on the jackets. The position and condition of anodes were also examined. Pitting and galvanic corrosion studies and cathodic protection experiments were carried out in synthetic sea water and in 3.5% NaCl solution. Field exposure studies were also
carried out. The present paper describes the investigations carried out to determine reasons for pitting corrosion on weld joints and remedial measures. Key words : pitting corrosion, weld joints, offshore structure jacket, cathodic protection