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建築設備配管系における異種金属接触腐食と対策
Galvanic corrosion and corrosion prevention in piping systems of building equipment |
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| 梗概 |
| 建築設備配管系における配管や機器の腐食問題は材質や継手の改良により顕著な赤水などは減少している。しかし一方で，銅，銅合金，ステンレス鋼，最近ではチタンなどの耐食性金属材料の登場は鉄鋼やアルミニウムなどの材質との接触により異種金属電池を形成し，電位の卑な（低い）金属の腐食を速める。実際に建物内で発生する異種金属接触腐食は現在でも跡を絶たない。本稿では異種金属接触腐食の原理と腐食要因，事例および対策について，これまでに解析してきた事象と実験 に基づいて解説する。 |
| キーワード：異種金属接触腐食，原理，腐食要因，事例，配管系絶縁処理判定表，膜脱気法 |
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| Summary |
| The corrosion problem of the architectural equipment piping land equipment like a remarkable reddish water etc. decreases by improving the material and the joint. However, the use of a corrosion resistance metallic materials such as copper, the copper alloy, stainless steels, and titanium generated the galvanic corrosion by contact with the metal with the potential difference such as steel and aluminum. The corrosion of less noble（the potential is low）metal was hastened in a different kind metallic joint. However, the galvanic corrosion has been actually still generated in the architectural equipment piping system. In this paper, it explains the mechanism of the galvanic corrosion, the corrosion factors, the corrosion cases, and measures of the galvanic corrosion on the analyzed corrosion phenomenon and the experiments. |
| Keywords: galvanic corrosion，mechanism, the corrosion factor, corrosion case, measure, the table to judge, whether insulation for galvanic corrosion prevention |
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技術研究所 主任研究員 博士（工学） |
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