JP6316719B2 - ボイラ水系システムの腐食抑制剤及び腐食抑制方法 - Google Patents
ボイラ水系システムの腐食抑制剤及び腐食抑制方法 Download PDFInfo
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- JP6316719B2 JP6316719B2 JP2014195369A JP2014195369A JP6316719B2 JP 6316719 B2 JP6316719 B2 JP 6316719B2 JP 2014195369 A JP2014195369 A JP 2014195369A JP 2014195369 A JP2014195369 A JP 2014195369A JP 6316719 B2 JP6316719 B2 JP 6316719B2
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- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
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- 229940099427 potassium bisulfite Drugs 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
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Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
(1)給水系統に設置したpH計の測定値をもとにpHが設定範囲になるように薬液注入ポンプ等を用いて注入する方法、
(2)電気伝導率とpHの関係を予め求めておき、給水系統に設置した電気伝導率計の測定値をもとに、pHの設定範囲に相当する電気伝導率の設定範囲になるように薬液注入ポンプ等を用いて注入する方法、
等がある。この場合、薬液注入を自動注入方法としてもよい。
400番研磨紙で研磨仕上げした寸法が1×13×75mmの低炭素鋼試験片(材質:JIS G3141 SPCC−SB)をアセトンで脱脂後、乾燥して試験前の質量を測定した。四日市市水をミリポア社製Milli-Qプラスシステム(商品名)に通水して得られたイオン交換水(比抵抗18MΩ・cm以上)に窒素ガスを通気して該イオン交換水の溶存酸素濃度を10μg/Lまで低下させた後、表1に示すアミン化合物を添加し、更に炭酸ガス又は水酸化ナトリウムを用いて表1に示すpH(25℃)に調整し、試験液とした。試験片1枚を入れたガラス瓶に試験液を溢れるまで満たし、密閉して温度70℃で7日間保持した。7日後、試験片を取り出して付着物を除去後、試験後の質量を測定し、下記の式(1)より腐食速度(mdd)を計算した。
腐食速度(mdd)=(W0−W1)/(S×T)・・・・(1)
W0:試験前の質量(mg)、W1:試験後の質量(mg)
S:試験片の表面積(dm2)
T:試験期間(日数)
同様に、前記低炭素鋼試験片に代えて、400番研磨紙で研磨仕上げした寸法が1×13×75mmのアルミニウム黄銅製試験片(材質:JIS H3100 C6871)を用いた試験を行った。
低炭素鋼試験片及びアルミニウム黄銅製試験片を用いた試験結果を表1に示す。
表2に示すアミン化合物及び還元性化合物を添加し、炭酸ガスと水酸化ナトリウムを用いるpH(25℃)調整を行わない以外は腐食試験1と同様の試験を行った。供試材質はJIS G3141 SPCC−SBである。結果を表2に示す。
400番研磨紙で研磨仕上げした寸法が1×13×75mmのアルミニウム黄銅製試験片(材質:JIS H3100 C6871)をアセトンで脱脂後、乾燥して試験前の質量を測定した。四日市市水をミリポア社製Milli-Qプラスシステム(商品名)に通水して得られたイオン交換水(比抵抗18MΩ・cm以上)に表3に示すアミン化合物及び還元性化合物を添加し、試験液として用いた。ここで、アミン化合物の添加量は試験液のpHが9.5になるように調整した。試験片1枚を入れたガラス瓶に試験液を溢れるまで満たし、密閉して温度70℃で7日間保持した。7日後、試験片を取り出して付着物を除去後、試験後の質量を測定し、前記の式(1)より腐食速度(mdd)を計算した。結果を表3に示す。
Claims (4)
- ボイラからの蒸気が食品や医薬品と接触する蒸気圧20MPa以下のボイラの水系システムに適用する腐食抑制剤であって、該ボイラ水系システムの給水及び/又は復水及び/又は凝縮水のpH(25℃)を7.0〜9.8に維持するアミン化合物を含み、前記アミンは、ピペリジン、ピロリジン、イソペンチルアミン、フェネチルアミン、ブチルアミンから選択される1種以上のアミン化合物である、ボイラの水系システムに適用する腐食抑制剤。
- 更に還元性化合物を含有することを特徴とする請求項1記載のボイラの水系システムに適用する腐食抑制剤。
- ボイラからの蒸気が食品や医薬品と接触する蒸気圧20MPa以下のボイラの水系システムに適用する腐食抑制方法であって、ピペリジン、ピロリジン、イソペンチルアミン、フェネチルアミン、ブチルアミンから選択される1種以上のアミン化合物をボイラ水系システムに添加すること及び該ボイラ水系システムの給水及び/又は復水及び/又は凝縮水のpH(25℃)を7.0〜9.8に維持することを特徴とするボイラ水系システムの腐食抑制方法。
- 更に還元性化合物を添加することを特徴とする請求項3記載のボイラ水系システムの腐食抑制方法。
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