JPS6316470B2 - - Google Patents
Info
- Publication number
- JPS6316470B2 JPS6316470B2 JP57018717A JP1871782A JPS6316470B2 JP S6316470 B2 JPS6316470 B2 JP S6316470B2 JP 57018717 A JP57018717 A JP 57018717A JP 1871782 A JP1871782 A JP 1871782A JP S6316470 B2 JPS6316470 B2 JP S6316470B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- less
- rubber
- crevice
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920001971 elastomer Polymers 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 238000005536 corrosion prevention Methods 0.000 claims description 2
- 239000003566 sealing material Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 3
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000010060 peroxide vulcanization Methods 0.000 claims 1
- 238000004073 vulcanization Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 sulfur ions Chemical class 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は揚水管の防食方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for preventing corrosion of a pumping pipe.
海水や河川を工業用水として、これらの水をた
とえば給排水するポンプもしくは配管など揚水管
はいちじるしく腐食作用を受ける。
When seawater or river water is used as industrial water, lifting pipes such as pumps or pipes that supply and drain this water are severely corroded.
こうしたポンプもしくは配管において発生する
腐食作用のうち、すきま腐食はボルトの締付部分
やシール材によるシール部分のように微細なすき
ま内の金属表面（以下、内表面と称す）に発生す
る腐食であり、外観上、見えない部分で発生し、
一度発生すると著しく早い速度で進行し、軽微な
損傷でも液洩れや圧力損失による効率の低下等、
その影響は重大なことが多い。 Among these corrosion effects that occur in pumps or piping, crevice corrosion is corrosion that occurs on the metal surface (hereinafter referred to as the inner surface) within minute gaps such as the tightened part of bolts and the sealed part by sealing material. , occurs in an area that is not visible from the outside,
Once it occurs, it progresses at an extremely rapid rate, and even minor damage can cause problems such as fluid leaks and reduced efficiency due to pressure loss.
The effects are often significant.
これらのすきま内は物質の移動がおこなわれ難
いため、すきま内の液質は溶存酸素が補給され難
いことと、アニオン等の吸着作用により還元性と
なりやすい。他方、外表面付近では溶質の濃度が
比較的均一であるから酸化性である。 Since it is difficult for substances to move within these gaps, the liquid quality within the gaps is likely to become reducing due to the difficulty in replenishing dissolved oxygen and the adsorption action of anions and the like. On the other hand, near the outer surface, the solute concentration is relatively uniform and therefore oxidizing.
このため、すきま内表面は電気化学的にアノー
ド分極し、隣接する外表面がカソード分極して、
すきま内が腐食する。 Therefore, the inner surface of the gap is electrochemically polarized anodically, and the adjacent outer surface is polarized cathodically.
The inside of the crevice corrodes.
すきま腐食の特徴として、すきま内が外表面に
比較して卑電位系にアノード分極することと、す
きま内液質は酸化側に移行していることである。
こうしたことで、すきま腐食はステンレス鋼系材
料では回避出来ない特有の問題である。 The characteristics of crevice corrosion are that the inside of the crevice is anodically polarized to a more base potential system than the outer surface, and that the liquid quality within the crevice shifts to the oxidizing side.
For this reason, crevice corrosion is a unique problem that cannot be avoided with stainless steel materials.
本発明は上記に鑑みてなしたものでポンプもし
くは配管などの揚水管の腐食方法を提供すること
を目的とする。
The present invention has been made in view of the above, and an object of the present invention is to provide a method for corroding a pump or a pumping pipe such as piping.
本発明の基本概念は、すきま内と隣接するすき
ま外表面との間に電位差を発生させないこと、す
きま内液質を金属の不働態皮膜が安定な状態、す
なわち中性−弱アルカリ性とすることである。
The basic concept of the present invention is not to generate a potential difference between the inside of the gap and the outer surface of the adjacent gap, and to keep the liquid quality in the gap in a state where the passive metal film is stable, that is, neutral to weakly alkaline. be.
ここで、金属もしくは過酸化物により架橋する
ゴム質基材100に対し亜鉛微粒子；0.5〜3.5重量
％、静電荷を帯電した炭素粉末；0.2〜2.5重量
％、酸化マグネシウム；0.2〜1.0重量％の割合で
添加したゴム質シート材あるいはシールリング
は、ポンプ、配管など揚水管の接続部のシール面
に用いると、そのすきま内表面をカソード分極し
て、あわせて隣接の外表面をもカソード分極す
る。 Here, zinc fine particles: 0.5 to 3.5% by weight, electrostatically charged carbon powder: 0.2 to 2.5% by weight, and magnesium oxide: 0.2 to 1.0% by weight, based on 100% of the rubber base material crosslinked with metal or peroxide. When a rubber sheet material or seal ring added in a certain proportion is used for the sealing surface of a connection part of a pump, piping, etc., it cathodically polarizes the inner surface of the gap and also cathodically polarizes the adjacent outer surface. .
ここで、ゴム質中の亜鉛微粒子はアノード分極
して溶解し、さらに、その溶解過程と、溶解によ
り生成した非晶質の水酸化亜鉛はすきま内液質を
弱アルカリ性として、すきま内表面の不働態皮膜
を安定にする。このように、すきま腐食を防止す
るために本発明のゴム質をシート材あるいはリン
グ状として、接続部のシールに用いることは上記
のように有効である。 Here, the fine zinc particles in the rubber material are anodically polarized and dissolved, and the dissolution process and the amorphous zinc hydroxide produced by the dissolution make the liquid in the crevice slightly alkaline, making the surface of the crevice impregnated. Stabilizes the working film. Thus, in order to prevent crevice corrosion, it is effective to use the rubber material of the present invention in the form of a sheet material or a ring to seal the connection portion, as described above.
また、前記、ゴム質において、基材ゴム質を、
金属もしくは過酸化物により架橋したものに限定
したことは、硫黄等により架橋したものは使用の
過程において、硫黄イオンが溶出して腐食性を示
すために限定したものである。 In addition, in the rubber material mentioned above, the base rubber material is
The reason why the material is limited to those cross-linked with metal or peroxide is because those cross-linked with sulfur or the like elute sulfur ions and exhibit corrosive properties during the process of use.
また亜鉛微粒子の添加の割合は0.5重量％以下
では防食効果が持続せず、3.5重量％以上では弾
性強さの低下がいちじるしいため0.5〜3.5重量％
に限定した。 In addition, if the proportion of zinc fine particles added is less than 0.5% by weight, the anticorrosion effect will not last, and if it is more than 3.5% by weight, the elastic strength will drop significantly, so the proportion is 0.5 to 3.5% by weight.
limited to.
静電荷を帯電した炭素微粉末は、ゴム質内に分
散した亜鉛を効率的に消費させる点で、その役割
は大きい。その効果は0.2重量％以下では少なく、
2.5重量％以上では防食性を阻害するため0.2〜2.5
重量％に限定した。 The electrostatically charged carbon fine powder plays a major role in efficiently consuming the zinc dispersed within the rubber material. The effect is small below 0.2% by weight.
If it exceeds 2.5% by weight, corrosion resistance will be inhibited, so 0.2 to 2.5
% by weight.
酸化マグネシウムはゴム基質の吸湿性を良く
し、ゴム質中に分散している亜鉛微粒子の消費を
効果的に促進させるために必要である。その量は
0.2重量％以下では効果が少なく1.0重量％以上で
はゴムが劣化するために0.2〜1.0重量％に限定さ
れる。 Magnesium oxide is necessary to improve the hygroscopicity of the rubber substrate and effectively promote the consumption of fine zinc particles dispersed in the rubber material. The amount is
If it is less than 0.2% by weight, the effect will be small, and if it is more than 1.0% by weight, the rubber will deteriorate, so it is limited to 0.2 to 1.0% by weight.
以下図によつて本発明の実施例を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図は本発明を適用したポンプとその配管のすき
ま腐食防止方法を示したものである。 The figure shows a method for preventing crevice corrosion of a pump and its piping to which the present invention is applied.
図中、１はランナー、２はケーシング、３はベ
ルマウス、４は本発明品のゴムシート、５は本発
明品のゴムシールリング、６は締付ボルト、７は
本発明品のシールペーストを示す。 In the figure, 1 is a runner, 2 is a casing, 3 is a bell mouth, 4 is a rubber sheet of the present invention, 5 is a rubber seal ring of the present invention, 6 is a tightening bolt, and 7 is a seal paste of the present invention. .
図中、シールリング５やシール用のシートプレ
ート４は金属架橋したクロロプレンゴム基材100
に対し静電荷を帯電した炭素粉末：0.35重量％、
酸化マグネシウム：0.6重量％、亜鉛微粉末：2.0
重量％を添加したゴムにより製作した。 In the figure, the seal ring 5 and the sealing sheet plate 4 are made of metal-crosslinked chloroprene rubber base material 100.
Electrostatically charged carbon powder: 0.35% by weight,
Magnesium oxide: 0.6% by weight, zinc fine powder: 2.0
Manufactured from rubber to which % by weight was added.
以上説明したように本発明によれば、犠牲陽極
としての亜鉛が有効に消費され、すきま腐食はい
ちじるしく防止される。
As explained above, according to the present invention, zinc as a sacrificial anode is effectively consumed and crevice corrosion is significantly prevented.
図面は本発明の防食方法を適用したポンプとそ
の配管の縦断面図である。
１……ライナー、２……ケーシング、３……ベ
ルマウス、４……ゴムシート、５……ゴムシール
リング、７……シールペースト。
The drawing is a longitudinal sectional view of a pump and its piping to which the corrosion prevention method of the present invention is applied. 1... Liner, 2... Casing, 3... Bell mouth, 4... Rubber sheet, 5... Rubber seal ring, 7... Seal paste.
Claims (1)
Mn：５重量％以下、Cr：30重量％以下、Ni：25
重量％以下、残部Feとからなる鉄系合金から構
成する揚水管の接続部に、金属加硫もしくは過酸
化加硫により基質を構成したゴム類100に対し亜
鉛微粉末；0.5〜3.5重量％、静電荷を帯電した炭
素粉末；0.2〜2.5重量％、酸化マグネシウム；0.2
〜1.0重量％の割合で添加した吸湿性とすきま腐
食防止性を具備したシール材を介在させることを
特徴とする揚水管の防食方法。1 C: 3% by weight or less, Si: 3% by weight or less,
Mn: 5% by weight or less, Cr: 30% by weight or less, Ni: 25
Fine zinc powder; 0.5 to 3.5% by weight per 100% of rubber whose substrate is formed by metal vulcanization or peroxide vulcanization at the connection part of a lifting pipe made of an iron-based alloy with the balance Fe. Electrostatically charged carbon powder; 0.2-2.5% by weight, magnesium oxide; 0.2
A method for preventing corrosion of a pumping pipe, characterized by interposing a sealing material having hygroscopicity and crevice corrosion prevention properties, which is added at a rate of ~1.0% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018717A JPS58136785A (en) | 1982-02-10 | 1982-02-10 | Corrosion preventive method of water lift pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018717A JPS58136785A (en) | 1982-02-10 | 1982-02-10 | Corrosion preventive method of water lift pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58136785A JPS58136785A (en) | 1983-08-13 |
| JPS6316470B2 true JPS6316470B2 (en) | 1988-04-08 |
Family
ID=11979405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57018717A Granted JPS58136785A (en) | 1982-02-10 | 1982-02-10 | Corrosion preventive method of water lift pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58136785A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5879216B2 (en) * | 2012-06-27 | 2016-03-08 | 株式会社日立製作所 | Seawater desalination equipment |
-
1982
- 1982-02-10 JP JP57018717A patent/JPS58136785A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58136785A (en) | 1983-08-13 |
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