An Electrochemical Study of Cathodic Protection of Steel Used for Marine Structures

Seong-Jong Kim; Masazumi Okido; Kyung-Man Moon

Korean Journal of Chemical Engineering, Vol.20, No.3, 560-565, May, 2003

DOI10.1007/BF02705566 Export Citation

An Electrochemical Study of Cathodic Protection of Steel Used for Marine Structures

Seong-Jong Kim^†, Masazumi Okido, and Kyung-Man Moon¹

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
¹Korea Maritime University, Busan 606-791, Japan

E-mail:

Impressed current cathodic protection can result in hydrogen embrittlement, which can cause trouble with high-strength steels, particularly at welds. Therefore, the limiting potential for hydrogen embrittlement should be examined in detail as a function of the cathodic protection potential. This study investigated the effects of post-weld heat treatment (PWHT) on marine structural steels from an electrochemical viewpoint. In addition, the slow strain rate test (SSRT) was used to investigate both the electrochemical and mechanical effects of PWHT on impressed current cathodic protection. According to the SSRT, the optimum cathodic protection potential was -770 mV [with a saturated calomel electrode (SCE)]. SEM fractography analysis showed that the fracture morphology at an applied cathodic protection potential of -770~-850 mV (SCE) was a dimpled pattern with ductile fractures, while a transgranular pattern was seen at potentials below -875 mV (SCE). Therefore, the cathodic protection potential range should be -770~-850 mV (SCE).

Keywords:Slow Strain Rate Test;Impressed Current Cathodic Protection;Hydrogen Embrittlement;Post-weld Heat Treatment

[References]

Bandyyopadhy N, Kameda J, McMahon CJ, Metallur. Trans., 14A, 881 (1983)
Beahem CD, Metallur. Trans., 3, 437 (1972)
Bhaduri AK, Sujith S, Srinivasan G, Gill TPS, Mannan SL, "Optimized PWHT Procedures for 17-4 PH Stainless Steels," Welding Research Supplement, 153 (1995)
Bloch C, Hill J, Connell D, Welding J., May, 31 (1997)
deKazinczy F, J. Iron Steel Inst., 177, 85 (1954)
Francis R, Byrne G, Warbartan GR, "The Effect of Cathodic Protection on Duplex Stainless Steels in Sea Water," An Official NACE International Publication, 46 (1999)
Hasimoto T, Boshoku Gijutsu, 37, 559 (1988)
Kim CD, Wilde BE, ASTM STP, 665, 97 (1979)
Kim SJ, Park TW, Shim IO, Kim JH, Kim YS, Moon KM, J. Korean Welding Soc., 19, 45 (2001)
Lee KH, Gragnolino G, Macdonald DD, Corrosion, 41, 540 (1985)
Maier HJ, Kaesche H, "Hydrogen Effects on Material Behavior," Japan High Pressure Technology Association, Stress Annealing Committee Section, 3 (1982)
Masazi O, Boshoku Gijutsu, 13, 7 (1964)
Moody NR, Thompson AW, "TMS," Warrendale, PA, 733 (1990)
Rothwell N, Turner MED, Mater. Performance, Feb., 55 (1990)
Saito M, Shoji T, Takahasi H, Miura K, Kumabu M, J. Jpn. Mech. Soc. A, 54, 746 (1987)
Singh Raman RK, Granmoorthy JB, Welding Res., Apr., 133 (1995)
Thompson AW, Chesnutt JC, Metallur. Trans., 10A, 1193 (1979)
VonBaeckmann W, Schwenk W, Prinz W, "Handbook of Cathodic Corrosion Protection," Gulf Publishing Company, Houston, 72 and 369 (1997)
Yamaguchi Y, Nonaka H, Yamakawa K, Corrosion, 53, 147 (1998)

[Referenced By]

[1] Bandyyopadhy N, Kameda J, McMahon CJ, Metallur. Trans., 14A, 881 (1983)

[2] Beahem CD, Metallur. Trans., 3, 437 (1972)

[3] Bhaduri AK, Sujith S, Srinivasan G, Gill TPS, Mannan SL, "Optimized PWHT Procedures for 17-4 PH Stainless Steels," Welding Research Supplement, 153 (1995)

[4] Bloch C, Hill J, Connell D, Welding J., May, 31 (1997)

[5] deKazinczy F, J. Iron Steel Inst., 177, 85 (1954)

[6] Francis R, Byrne G, Warbartan GR, "The Effect of Cathodic Protection on Duplex Stainless Steels in Sea Water," An Official NACE International Publication, 46 (1999)

[7] Hasimoto T, Boshoku Gijutsu, 37, 559 (1988)

[8] Kim CD, Wilde BE, ASTM STP, 665, 97 (1979)

[9] Kim SJ, Park TW, Shim IO, Kim JH, Kim YS, Moon KM, J. Korean Welding Soc., 19, 45 (2001)

[10] Lee KH, Gragnolino G, Macdonald DD, Corrosion, 41, 540 (1985)

[11] Maier HJ, Kaesche H, "Hydrogen Effects on Material Behavior," Japan High Pressure Technology Association, Stress Annealing Committee Section, 3 (1982)

[12] Masazi O, Boshoku Gijutsu, 13, 7 (1964)

[13] Moody NR, Thompson AW, "TMS," Warrendale, PA, 733 (1990)

[14] Rothwell N, Turner MED, Mater. Performance, Feb., 55 (1990)

[15] Saito M, Shoji T, Takahasi H, Miura K, Kumabu M, J. Jpn. Mech. Soc. A, 54, 746 (1987)

[16] Singh Raman RK, Granmoorthy JB, Welding Res., Apr., 133 (1995)

[17] Thompson AW, Chesnutt JC, Metallur. Trans., 10A, 1193 (1979)

[18] VonBaeckmann W, Schwenk W, Prinz W, "Handbook of Cathodic Corrosion Protection," Gulf Publishing Company, Houston, 72 and 369 (1997)

[19] Yamaguchi Y, Nonaka H, Yamakawa K, Corrosion, 53, 147 (1998)