| Summary: | 碩士 === 國立雲林科技大學 === 文化資產維護系碩士班 === 94 === A cannon was found in the south of Taiwan in September of 2002. After removing the mud from the cannon at that time, it was wrapped up with bubble plastic and brown paper. The cannon was then moved to the local government''s storehouse, logged in as an important culture asset, and for safe keeping. The marine cannon was quite intact at that time, but was not kept under a good maintenance situation, and more than one year later, the marine cannon was corroded and even flaking. Tests on a fragment of the cannon by SEM/EDS confirmed it as iron
The problem of marine iron conservation has not yet been engaged in Taiwan. This study collects relevant documents concerning the elimination of rust and the removal of chlorides. The experiment compares the benefits of the chemical treatments that these documents describe. The purpose of this study is to reveal an effective safeguard method for marine iron objects.
After testing six iron corrosion removal solutions, and eight kinds of alkaline chlorine removal solutions, their efficiencies were evaluated. The best rust removal solution was hydrochloric acid at pH 1.10~0.60 and NaOH at pH 11.80~12.85 was proved to be the best solution to remove the chloride. Trisodium phosphoric acid and sodium silicate were most effective at suppressing iron to corrosion. It is proposed that when finding ironware in the sea, keep the original state (either do not bring the objects to the surface ) as a temporary measure or keep the object submerged in the original water (river or sea water ), until it is possible to notify and employ workers/personnel.
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