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材料と環境 Vol. 69 (2020), No. 10

ISIJ International
belloff
オンライン版ISSN: 1881-9664
冊子版ISSN: 0917-0480
発行機関: Japan Society of Corrosion Engineering

Backnumber

  1. Vol. 73 (2024)

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  2. Vol. 72 (2023)

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  3. Vol. 71 (2022)

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  4. Vol. 70 (2021)

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  31. Vol. 43 (1994)

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  32. Vol. 42 (1993)

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キーワードランキング

10 May. (Last 30 Days)

材料と環境 Vol. 69 (2020), No. 10

軟らかい塩基としてのデカメチレンイミンの評価

荒牧 國次

pp. 259-261

DOI:

10.3323/jcorr.69.259

抄録

The softness of decamethyleneimine （CH2）10 NH as a base was evaluated using the relationship between the inhibition efficiency, I and the softness as a base, En. The value thus obtained was En＝2.43, remarkably high, depending on π-characterized unshared pair of electrons at the N atom caused by strain in the ring.

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鋼板表面に付着した金属成分による塗膜欠陥部の耐食性改善効果

小林 弘明, 森田 晃一, 山下 勝也, 片岡 泰弘

pp. 262-270

DOI:

10.3323/jcorr.69.262

抄録

Coated steel structures are periodically re-coated due to deterioration of the coated film. To obtain a good resistance to corrosion after re-coating requires a fully sufficient removal of rust and residual film from the steel plate surface, through preparation of that surface. Clarification of the post-coating corrosion resistance of steel plate with an adherence of metal constituents deriving from the plated film and wire material will presumably provide knowledge useful for establishing the optimal method for surface preparation. This study consequently examined the effect exerted on post-coating corrosion resistance by metal constituents adhering to the steel plate surface. It found that coated steel plate whose surface had been prepared with a zinc-plated wire brush yielded a good resistance to corrosion as compared to other coated steel plate. To determine the cause, an examination was made from the perspectives of electrochemical properties, composition analysis, and surface free energy. The results indicated the possibility that corrosion products in the slight traces of zinc adhering to the steel plate may have curtailed the progress of corrosion by acting as a barrier to the diffusion of oxygen.

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鋼板表面に付着した金属成分による塗膜欠陥部の耐食性改善効果

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水道水環境における炭素鋼の腐食（Ⅰ）新しい水質指標を用いた腐食性評価方法

中村 勇二, 松川 安樹, 岡崎 慎司, 朝倉 祝治

pp. 271-276

DOI:

10.3323/jcorr.69.271

抄録

A new method to evaluate the corrosivity of tap water to carbon steel has been proposed. Corrosion tests for the tap waters sampled at 49 locations throughout Japan were conducted. Average corrosion rate vw and maximum one vmax were measured. Relatively close relationship of vw and vmax to concentration of SiO2 and SO42－ were found. On the other hand, the corrosion rates showed slight dependence on concentrations of Cl－ and HCO3－. These facts are contradictory to the conventional knowledge. Furthermore, the authors surmised that [SO42－]/[SiO2], named SS ratio, was an effective Corrosion Index. SS ratio showed closer relationship to vw and vmax than Langelier Index, Ryznar Stability Index and Larson-Skold Index. The authors succeeded in expressing vw and vmax as a function of only SS ratio.

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水道水環境における炭素鋼の腐食（Ⅰ）新しい水質指標を用いた腐食性評価方法

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