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Specimens used in this study.
| symbol | contents |
|---|---|
| a | control (without spec.) |
| b | carbon steel (JIS SS400) |
| c | tin plated steel (film thickness 10 micrometer) |
| d | silver plated steel |
| e | tin-silver alloy specimen (without heat treatment) |
| f | tin-silver alloy specimen heat treated in 473 K for 10.8 ks |
| g | stainless steel (JIS SUS304) |
| h | copper plated specimen |
| i | zinc plated specimen |
| j | cobalt plated specimen |
