Abstract
The authors made a study on anti-corrosion treatment of iron base sintered structural parts, which were collected by the Japan Society of Powder and Powder Metallurgy, to be preserved as memorial samples for more than 100 years in the future. The requirements: 1) The anti-corrosion treatment should be effective for such a long period of time. 2) It should be possible to restore the samples to their original states physically and chemically if necessary during the preservation period.
To find the most practical method of anti-corrosion treatment which suits the above requirements, the authors tried four kinds of anti-corrosion treatment, and obtained the results.
The results: 1) Lacquer coating treatment proved to have the most effective anti-corrosion property among the four methods. 2) The lacquer coating did not cause any change in dimensions of the samples. 3) The lacquer filled the pores of the sample whose apparent density was less than 6.4 g/cm3, but was easily removed by extraction with a solvent such as acetone. 4) As for the sample having 7.0 g/cm3 apparent density, the lacquer did not penetrate through the pores into internal body of the sample even when the sample was dipped in lacquer.
Based upon these results, the authors conclude that lacquer coating treatment is the most practical and suitable method for the above-mentioned purpose.
