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May 10, 2026Zairyo-to-KankyoOpen Access

Application Examples of Stainless Steel Usage Judgment Chart （Critical Potential Index Diagram: CPI Diagram）

Takeshi Daikuhara Takaaki Yoshii

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Key Points

The aim is to assess the reliability of the CPI diagram in judging stainless steel usage.
Used actual data to validate the CPI diagram.
Analyzed 8 cases to compare the CPI judgment against real phenomena.
Introduced an additional CPI pH metric to address inconsistencies.
7 out of 8 cases aligned well with CPI judgment and observed phenomena.
One case with low pH was reconciled by incorporating additional pH data.
Current findings indicate a good level of consistency.

Implication

Validation of the CPI Diagram for stainless steel use in various scenarios, suggesting improved accuracy.

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Cite This Study

Daikuhara et al. (2026) studied this question.

synapsesocial.com/papers/6a3780b224f042ddf4c5ab05 https://doi.org/10.3323/jcorr.75.111

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