種々の条件下に土壌埋設したステンレス鋼の自然電位変化と腐食挙動

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  • Variation of Corrosion Potential and Corrosion Behavior of Stainless Steels in Some Underground Corrosion Test Conditions
  • シュジュ ノ ジョウケンカ ニ ドジョウ マイセツシタ ステンレス コウ ノ

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In order to clarify the corrosion resistance of stainless steel in soil, field corrosion tests for SUS 430, 304, and 316 were carried out at several sites for 12-21 months together with three companys' laboratories. And also, round robin test for water extraction analysis of the soil was carried out to understand the chemical characterization. The kinds fo soils for their tests are sand, Kanto loam, Ando soil and clay, and the ranges of pH and Cl- ion concentration of the extracted water are. pH 5.5-8.2 and Cl- 4-615ppm, respectively. The corrosion potentials, Ecorr, of the specimens in soil were in the region of -0.6-+0.5V (v. s. SCE), and Ecorr -time curves exhibited much different patterns depend on the groundwater level and the depth of the specimens. At a sandy land (Kinuura, Cl- 615ppm), all specimens (square type and belt type) of SUS 430 and a vertically buried belt type specimen of SUS 304 were suffered from localized corrosion with crevice corrosion. The corrosion test results suggest that a change of Ecorr relates to the change of the groundwater level and the underground corrosion process of the stainless steel involves oxygen differential cell reaction.

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