JP2022152538A - 冷却水系に設けられた金属の腐食抑制方法 - Google Patents
冷却水系に設けられた金属の腐食抑制方法 Download PDFInfo
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- JP2022152538A JP2022152538A JP2021055348A JP2021055348A JP2022152538A JP 2022152538 A JP2022152538 A JP 2022152538A JP 2021055348 A JP2021055348 A JP 2021055348A JP 2021055348 A JP2021055348 A JP 2021055348A JP 2022152538 A JP2022152538 A JP 2022152538A
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- Prior art keywords
- acid
- cooling water
- corrosion
- component
- water system
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Abstract
Description
本発明の一実施形態である、冷却水系に設けられた金属の腐食抑制方法は、冷却水系を流れる冷却水であって冷却水処理剤が添加された冷却水の溶存アルミニウム濃度を2mg/L未満に制御することを特徴とする。本実施形態によれば、冷却水系に設けられた金属の腐食を抑制することができる。本発明者らは、冷却水の溶存アルミニウム濃度が2mg/Lを超えることによって腐食が特に進行することを発見し、この発明に至った。
(成分(A))
・HEDP(1-ヒドロキシエチリデン-1,1-ジホスホン酸、商品名:BELCLENE 660LA、BWA社製)
・PBTC(2-ホスホノブタン-1,2,4-トリカルボン酸、商品名:BELCLENE 650、BWA社製)
・AA-MA-P:アクリル酸とマレイン酸と次亜リン酸の共重合体(平均分子量450)
・AA-AMPS:アクリル酸と2-アクリルアミド-2-メチルプロパンスルホン酸(共重合比(質量)60:40、重量平均分子量10,000)
・ポリマレイン酸:50%ポリマレイン酸溶液(平均分子量500)
・オルトリン酸
・PEG#400(日本油脂株式会社製)
・N,N-ジメチルオレイン酸アミド(商品名:テクスノールODM、日本乳化剤株式会社製)
腐食試験は、以下の方法で行った。まず、JIS K0100-1990 工業用水腐食試験方法(回転法)に準拠して、寸法が50mm×30mm×1mmであり、表面積が0.316dm2である低炭素鋼(JIS G 3141SPCC-SB)試験片をアセトンで脱脂後に乾燥させ、質量を測定した。
腐食速度[mdd]=(試験片の減少量[mg])/{(試験片表面積[dm2])×(試験日数[日])}
12…供給バルブ
13…処理剤バルブ
14…ブローダウンポンプ
19…水温計
20…水槽
30…循環ポンプ
40…電気伝導度測定セル
50…流量調整バルブ
60…流量計
70…熱交換器
100…冷却水系
Claims (6)
- 冷却水系に設けられた金属の腐食抑制方法であって、
前記冷却水系を流れる冷却水であって冷却水処理剤が添加された前記冷却水の溶存アルミニウム濃度を2mg/L未満に制御することを特徴とする、腐食抑制方法。 - 請求項1に記載の腐食抑制方法であって、
前記冷却水処理剤は、成分(A)と成分(B)との少なくとも一方を含み、
前記成分(A)は、(i)有機ホスホン酸と、(ii)ホスフィノポリカルボン酸と、(iii)ホスホノカルボン酸と、(iv)リン酸と、(v)アクリル酸とマレイン酸とイタコン酸との少なくとも一つを構成単位として含みホスフィノ基を有さないエチレン性不飽和カルボン酸重合体と、からなる群から選ばれる少なくとも1つ又はその塩を含み、
前記成分(B)は、脂肪酸モノアミドと、多価アルコールと、多価アルコールの誘導体と、多価フェノールと、多価フェノールの誘導体と、からなる群から選ばれる少なくとも一つを含むことを特徴とする、腐食抑制方法。 - 請求項2に記載の腐食抑制方法であって、
前記成分(A)は、アクリル酸とマレイン酸とを構成単位として含み、次亜リン酸を連鎖移動剤として用いるホスフィノポリカルボン酸又はその塩であることを特徴とする、腐食抑制方法。 - 請求項2又は請求項3に記載の腐食抑制方法であって、
前記成分(B)は、分子量200~800のポリエチレングリコールであることを特徴とする、腐食抑制方法。 - 請求項1から請求項4までのいずれか一項に記載の腐食抑制方法であって、
前記冷却水系は開放型循環冷却水系であることを特徴とする、腐食抑制方法。 - 請求項2から請求項5までのいずれか一項に記載の腐食抑制方法であって、
前記冷却水処理剤は、前記成分(A)と前記成分(B)とを含むことを特徴とする、腐食抑制方法。
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