Effect of Pipe Diameter on Electrochemical Behavior of Stainless Steel Type 304 Pipes in Tap Water
- 1 Technical Research Laboratory, DAI-DAN Co., Ltd., Saitama, Japan
- 2 Technical Research Laboratory, DAI-DAN Co., Ltd., Saitama, Japan
- 3 Gifu University, Gifu, Japan
- 4 Gifu University, Gifu, Japan
- 5 Gifu University, Gifu, Japan
- 6 Gifu University, Gifu, Japan
- 7 Gifu University, Gifu, Japan
Abstract
We investigated the effects of pipe diameter on the corrosion resistance of stainless steel type 304 pipes using electrochemical measurements. Compared to plate steel, pipes have harder physical properties and tend to be harder and showed greater permeability with decreasing inner diameter. We found that the maximum corrosion current density in the secondary active state, which is the starting point of secondary passivation, appeared in the polarization curve measurement in tap water. Similar to the Vickers hardness and the maximum current density in the secondary active state, the permeability tended to increase as the diameter decreased. This is thought to increase the amount of deformation-induced martensitic and increase corrosion susceptibility. The peak of the secondary active current density was clearly seen as the potential sweep speed was increased. In addition, potential sweep speed dependence was observed in the corrosion susceptibility evaluation of deformation-induced martensite. In comparison with acid treatment, the formation of deformation-induced martensite was considered to occur in the extreme surface layer. The maximum corrosion current density in the secondary active state is expected to be a new susceptibility evaluation method for evaluating the deformation-induced martensitic transformation.
- Tanaka, N., Sato, S., Watanabe, I., Yoshida, M., Yamada, Y. and Sakurada, O. (2017) Cases of Corrosion in Tap Water and Hot Water Supply Facilities of Stainless Steel Type 304 Pipes and Fundamental Study on Their Corrosion Resistance. Journal of the Surface Finishing Society of Japan, 68, 641-646.
- Tanaka, N., Sato, S., Watanabe, I., Yamada, Y. and Sakurada, O. (2018) Corrosion in Tap Water and Hot Water Supply Facilities of Stainless Steel Type 304 Pipes. Materials Sciences and Applications, 9, 68-80. https://doi.org/10.4236/msa.2018.91005
- Honnma, M., Morita, S. and Yamaya, K. (1965) The Welding Structure of 13% Chromium Martensitic Stainless Steel and Its Rapid Heating and Cooling Behaviors. Journal of Japan Institute of Metals and Materials, 29, 1131-1136.
- Tamura, I. (1970) On the TRIP Steel. Journal of Japan Institute of Metals and Materials, 56, 429-445.
- Fiedler, H.C., Averbach, B.L. and Cohen, M. (1955) Tbo Effect of Deformation on the Martensite Transformation in Austonitio Steels. Transactions of the ASM, 47, 267.
- Buhler, H.E. and Schwenk, W. (1964) Einfluß der Gitterstruktur auf die Korrosion eines 18/10-Chrom-Nickel-Stahles. Werkstoffe und Korrosion, 15, 909-912. https://doi.org/10.1002/maco.19640151105
- Kamide, H. and Sugarwara, H. (1977) Role of Strain Induced Martensite on Stress Corrosion Cracking of 18-8 Stainless Steel in H2SO4-NaCl Solution. Journal of Japan Institute of Metals and Materials, 41, 528-534.
- Kamide, H. and Sugarwara, H. (1985) Relationship between the Dissolution Rate and the Dislocation Denstiy of α’-Martensite in H2SO4-NaCl Solution. BoushokuGijutsu, 34, 18-22.
- Copson, H.R. (1948) Corrosion Handbook. Wiley, New York.
- Sunada, S., Maesato, H., Yokoi, Y., Notoya, H., Sanuki, S. and Arai, K. (1990) Effect of Deformation-Induced Martensite on Pitting Corrosion of SUS304 Stainless Steel in H2SO4-NaCl Solution. Journal of Japan Institute of Metals and Materials, 54, 1078-1086.
- Miura, K., Kobayashi, S., Kamada, Y., Onuki, Y. and Szpunar, J.A. (2014) Relationship between Morphology of Strain-Induced Martensite Phase and Magnetic Properties in Austenitic Stainless Steels. Journal of Japan Institute of Metals and Materials, 78, 375-380.