| 摘要 |
An oxide film is formed on the surface of a sample made from a metal material by holding the above-described sample at a temperature of 800° C. or higher and 1,100° C. or lower in an oxygen-containing atmosphere, and the sample provided with the oxide film is immersed in a corrosive solution containing an acid and NaCl for a predetermined time. After immersion, the corrosion state (degree of denseness of oxide film, cracking state, and the like) of the sample is evaluated. The corrosion resistance of the sample can be evaluated appropriately and conveniently in a short period of time by causing accelerated corrosion in an environment simulating the actual environment of an internal combustion engine. |
