JP2001316859A - Corrosion inhibition method for metallic material - Google Patents
Corrosion inhibition method for metallic materialInfo
- Publication number
- JP2001316859A JP2001316859A JP2000345295A JP2000345295A JP2001316859A JP 2001316859 A JP2001316859 A JP 2001316859A JP 2000345295 A JP2000345295 A JP 2000345295A JP 2000345295 A JP2000345295 A JP 2000345295A JP 2001316859 A JP2001316859 A JP 2001316859A
- Authority
- JP
- Japan
- Prior art keywords
- sulfuric acid
- solution
- stainless steel
- corrosion
- carbon steel
- 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.)
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Links
Landscapes
- Prevention Of Electric Corrosion (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、硫酸または硫酸を
含有する溶液を取り扱う金属材料製の装置の腐食抑制に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of corrosion of a device made of a metal material which handles sulfuric acid or a solution containing sulfuric acid.
【０００２】[0002]
【従来の技術】これまで硫酸または硫酸含有溶液を炭素
鋼製またはステンレス鋼製装置で取り扱う場合には、硫
酸濃度や温度の条件によりこれらの材料に著しい全面腐
食が発生する。その腐食が装置の使用上許容できな場合
には、炭素鋼をステンレス鋼へ変更したり、またステン
レス鋼の中でも高濃度のクロム、ニッケル、モリブデン
を含有する特殊な種類の合金を選択するか、外部電源法
によるアノード防食方法を適用し金属材料の腐食を抑制
することが行われてきた。2. Description of the Related Art Heretofore, when a sulfuric acid or a sulfuric acid-containing solution is handled by a carbon steel or stainless steel apparatus, remarkable overall corrosion occurs in these materials depending on the conditions of sulfuric acid concentration and temperature. If the corrosion is unacceptable for use of the equipment, change the carbon steel to stainless steel, or select a special type of alloy containing a high concentration of chromium, nickel, molybdenum among stainless steel, It has been practiced to apply an anode corrosion protection method using an external power supply method to suppress corrosion of metal materials.
【０００３】前述したように炭素鋼の代わりにステンレ
ス鋼を装置の材料に採用して腐食を抑制する方法や、汎
用の３０４ステンレス鋼から高濃度のクロム、ニッケ
ル、モリブデンを添加した合金（例えば２０合金）や、
モリブデンを含むニッケル基合金（例えばＢ合金）等の
特殊な耐食材料を採用して腐食を抑制する方法は、材料
や製作費のコスト上昇を招くとともに納期が問題となる
場合が多い。外部電源法アノード防食法を熱交換器や反
応器、配管に適用し、炭素鋼やステンレス鋼の腐食を抑
制する方法の適用にあたっては、電極配置や電流制御に
関する種々の検討が必要であり、またそのための電極や
制御装置が必要である。また、装置の運転中は防食が達
成されているかの維持、管理も必要である。このため、
外部電源法アノード防食法の適応は特定の装置に限定さ
れ、広範囲に適用されていないのが現状である。[0003] As described above, stainless steel is used instead of carbon steel as the material of the apparatus to suppress corrosion, or a general-purpose 304 stainless steel alloy containing a high concentration of chromium, nickel, or molybdenum (for example, 20%). Alloys)
A method of suppressing corrosion by adopting a special corrosion-resistant material such as a nickel-based alloy containing molybdenum (for example, a B alloy) causes an increase in cost of materials and manufacturing costs and often causes a problem of delivery time. When applying the external power supply method and the anode corrosion protection method to heat exchangers, reactors, and piping to control the corrosion of carbon steel and stainless steel, various studies on electrode arrangement and current control are necessary. An electrode and a control device for that are required. In addition, it is necessary to maintain and manage whether the anticorrosion is achieved during the operation of the apparatus. For this reason,
The external power supply method The application of the anode anticorrosion method is limited to a specific device, and is currently not widely applied.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、特殊な合金
や外部電源法アノード防食法を用いず炭素鋼やタイプ３
０４やタイプ３１６等の汎用のステンレス鋼を硫酸また
は硫酸含有溶液環境で、腐食を抑制し装置の構成材料と
して使用することを目的とするものである。SUMMARY OF THE INVENTION The present invention provides a carbon steel or a type 3 steel without using a special alloy, an external power supply method, or an anodic protection method.
It is an object of the present invention to use a general-purpose stainless steel such as Type 04 or Type 316 in a sulfuric acid or sulfuric acid-containing solution environment to suppress corrosion and to use it as a constituent material of an apparatus.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
め本発明者らは、硫酸または硫酸含有溶液環境での炭素
鋼およびステンレス鋼の腐食現象について、鋭意研究し
た結果、炭素鋼製またはステンレス鋼製装置の一部に白
金、金または銀等の貴金属を接触させることにより、炭
素鋼またはステンレス鋼の腐食を抑制できることを発見
した。すなわち本発明は次のとおりである。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies on the corrosion phenomena of carbon steel and stainless steel in a sulfuric acid or sulfuric acid-containing solution environment, and as a result, have been made of carbon steel or stainless steel. It has been discovered that corrosion of carbon steel or stainless steel can be suppressed by bringing a noble metal such as platinum, gold or silver into contact with a part of a steel device. That is, the present invention is as follows.
【０００６】（１） 硫酸または硫酸含有溶液環境にお
いて、炭素鋼製装置またはステンレス鋼製装置の一部に
貴金属またはその合金を接触させる、または溶液中に貴
金属をイオンとして存在させることを特徴とする金属材
料の腐食抑制方法。 （２） 硫酸または硫酸含有溶液の硫酸濃度が７０ｗｔ
％以上の溶液であることを特徴とする前記（１）記載の
金属材料の腐食抑制方法。 （３） 接触またはイオンとして溶液中に存在させる貴
金属が白金、金、もしくは銀またはこれらの１種以上を
含む合金であることを特徴とする前記（１）または
（２）記載の金属材料の腐食抑制方法。(1) In a sulfuric acid or sulfuric acid-containing solution environment, a noble metal or an alloy thereof is brought into contact with a carbon steel device or a part of a stainless steel device, or a noble metal is present as an ion in a solution. A method for suppressing corrosion of metallic materials. (2) Sulfuric acid or sulfuric acid-containing solution has a sulfuric acid concentration of 70 wt.
%. The method for inhibiting corrosion of a metal material according to the above (1), wherein the solution is a solution of not less than 1%. (3) Corrosion of the metallic material according to (1) or (2), wherein the noble metal to be present in the solution as contact or ion is platinum, gold, or silver or an alloy containing at least one of them. Suppression method.
【０００７】以下、本願発明の詳細について具体的に説
明する。本発明においては、硫酸溶液中の硫酸濃度は７
０ｗｔ％以上が好ましく、より好ましくは８５ｗｔ％以
上で、この場合は炭素鋼またはステンレス鋼に対する顕
著な腐食抑制効果を示す。実用的な本防食方法の適用温
度は、炭素鋼の場合に５０℃以下が好ましく、ステンレ
ス鋼の場合に１００℃以下が好ましい。本発明の防食機
構については定かでないが、本発明者は以下の通り考え
る。Hereinafter, the present invention will be described in detail. In the present invention, the sulfuric acid concentration in the sulfuric acid solution is 7
The content is preferably 0 wt% or more, more preferably 85 wt% or more. In this case, a remarkable corrosion inhibiting effect on carbon steel or stainless steel is exhibited. The practical application temperature of the present anticorrosion method is preferably 50 ° C. or less for carbon steel and 100 ° C. or less for stainless steel. Although the anticorrosion mechanism of the present invention is not clear, the present inventors consider as follows.
【０００８】硫酸またはこれを含有する溶液環境では、
硫酸濃度および温度により、炭素鋼およびステンレス鋼
は活性態で全面腐食が発生する。同環境中でこれらの金
属材料は、自然浸漬の状態で活性態で全面腐食状態であ
っても、高電位側では不動態化して腐食が抑制される可
能性がある。この現象を利用して、従来の外部電源法の
アノード防食が適用されている。In a sulfuric acid or solution environment containing the same,
Depending on the sulfuric acid concentration and temperature, carbon steel and stainless steel are activated and cause general corrosion. In the same environment, even if these metal materials are in an active state in a naturally immersed state and are in a corroded state, they may be passivated on the high potential side to suppress corrosion. Utilizing this phenomenon, the anode corrosion protection of the conventional external power supply method is applied.
【０００９】同環境中で、白金、金、銀、およびこれら
の合金の腐食挙動を研究したところ、これらの貴金属の
硫酸環境中でのカソード分極特性は、炭素鋼およびステ
ンレス鋼のカソード分極特性に比較して、著しく活性で
あり過電圧の小さいことが明らかになった。環境条件に
よるが、ステンレス鋼の活性な電位域での貴金属のカソ
ード特性は、ステンレス鋼の活性溶解の電流密度に比較
して最大１０4倍程度大きい電流密度を示す場合があ
る。また、同環境中でこれらの貴金属は、耐食性が良好
であり、全面腐食速度は著しく小さいことも明らかにな
った。In the same environment, the corrosion behavior of platinum, gold, silver, and their alloys was studied. The cathodic polarization characteristics of these noble metals in a sulfuric acid environment were different from those of carbon steel and stainless steel. In comparison, it was found that the active substance was remarkably active and the overvoltage was small. Depending on the environmental conditions, the cathode characteristics of the noble metal in the active potential region of stainless steel may show a current density that is at most 10 4 times larger than the current density of active dissolution of stainless steel. It was also found that these noble metals had good corrosion resistance and the overall corrosion rate was extremely low in the same environment.
【００１０】これらの結果と、先に述べた炭素鋼および
ステンレス鋼の溶解挙動の特徴から、これらの金属材料
に特定の面積比以上の貴金属を接触させることにより、
金属材料の電位を自然状態より高い電位に維持すること
が可能となる。これにより、全面腐食の発生する活性態
から腐食の抑制された不動態にすることが容易である。
硫酸濃度、温度、金属材料の種類によるが、貴金属と炭
素鋼またはステンレス鋼の面積比は１／１００００以上
が好ましく、より好ましくは１／５００以上である。From these results and the characteristics of the dissolution behavior of carbon steel and stainless steel described above, by contacting these metallic materials with a noble metal having a specific area ratio or more,
It is possible to maintain the potential of the metal material at a higher potential than the natural state. This makes it easy to change from an active state in which general corrosion occurs to a passive state in which corrosion is suppressed.
Depending on the sulfuric acid concentration, the temperature and the type of metal material, the area ratio of the noble metal to carbon steel or stainless steel is preferably at least 1 / 10,000, more preferably at least 1/500.
【００１１】この防食法は、硫酸または硫酸含有溶液
に、貴金属の塩を共存させることにより溶液中で貴金属
イオンとして存在させることによっても、達成される。
この防食機構に関しては、炭素鋼またはステンレス鋼が
初期に全面腐食しているため、その表面でイオン化して
いた貴金属が析出し、金属表面の一部を覆う。これによ
り、貴金属が接触した場合と同様の効果が生じ、金属の
電位が活性態電位域から不動態電位域にシフトし、腐食
が抑制されるものと考えられる。This anticorrosion method can also be achieved by allowing a salt of a noble metal to coexist with sulfuric acid or a solution containing sulfuric acid to cause the solution to exist as a noble metal ion in the solution.
Regarding this anticorrosion mechanism, since carbon steel or stainless steel is corroded entirely at the beginning, the noble metal ionized on its surface precipitates and covers a part of the metal surface. Thereby, it is considered that the same effect as in the case where the noble metal comes into contact occurs, the potential of the metal shifts from the active state potential range to the passive potential range, and corrosion is suppressed.
【００１２】本発明で貴金属とは、原子番号４４〜４７
のRu、Rh、Pd、Agおよび原子番号７６〜７９のOs、Ir、
Pt、Auであり、さらにこれらの合金であっても良い。こ
れらの貴金属は環境の腐食性に応じて適宜選択される
が、硫酸または硫酸含有溶液においては特にPt（白
金）、Au（金）、Ag（銀）またはこれらの１種以上を含
む合金が耐食性に優れている。ここで用いられている合
金とは、Pt、AuまたはAgの合計の含有量が５０ｗｔ％以
上のものが特に好ましい。In the present invention, the noble metal is an atomic number of 44 to 47.
Of Ru, Rh, Pd, Ag and Os, Ir of atomic numbers 76 to 79,
Pt and Au, and further, these alloys may be used. These noble metals are appropriately selected according to the corrosiveness of the environment. In the case of sulfuric acid or a sulfuric acid-containing solution, Pt (platinum), Au (gold), Ag (silver) or an alloy containing one or more of these metals is particularly resistant to corrosion. Is excellent. The alloy used here is particularly preferably an alloy having a total content of Pt, Au or Ag of 50% by weight or more.
【００１３】貴金属の炭素鋼またはステンレス鋼への接
触方法については特に制約はないが、貴金属の無垢材を
接触させることや、対象金属材料製装置の表面の一部に
貴金属をメッキ、クラッド、蒸着、溶射、スパッタリン
グ、イオンプレーティング等を施工し接触させること、
およびこれらの手法で貴金属被覆した部材を接触させる
こともできる。これらの貴金属と対象金属製装置が、電
気的に導通していることが必要である。本発明で対象と
する装置は、硫酸または硫酸含有溶液環境で使用される
全ての炭素鋼製またはステンレス鋼製の機器、装置であ
り、反応器、塔、槽、配管、熱交換器、フィルタ、ポン
プ、弁、計装関連機器等である。There are no particular restrictions on the method of contacting the noble metal with the carbon steel or stainless steel. Applying and spraying, spraying, sputtering, ion plating, etc.,
Also, a member coated with a noble metal by these methods can be brought into contact. It is necessary that these precious metals and the target metal device are electrically connected. The apparatus targeted by the present invention is all carbon steel or stainless steel equipment and apparatuses used in sulfuric acid or a sulfuric acid-containing solution environment, and includes reactors, towers, tanks, piping, heat exchangers, filters, Pumps, valves, instrumentation-related equipment, etc.
【００１４】[0014]
【発明の実施の形態】次に、実施例によって本発明を詳
細に説明する。Next, the present invention will be described in detail with reference to examples.
【００１５】[0015]
【実施例１】９８ｗｔ％硫酸の８０℃の水溶液環境に、
タイプ３０４ステンレス鋼およびタイプ３１６ステンレ
ス鋼を金と接触させた状態と接触しない状態で浸漬し腐
食試験を実施した。なお、接触した場合の金とステンレ
ス鋼の面積比は、１：１であった。試験前後の重量変化
から腐食速度を算出し、結果を表１に示した。これよ
り、金を接触させることによりステンレス鋼の腐食速度
は、タイプ３０４鋼の場合もタイプ３１６鋼の場合も１
／８程度になることが明らかとなった。[Example 1] In an aqueous solution environment of 98 wt% sulfuric acid at 80 ° C,
Type 304 stainless steel and type 316 stainless steel were dipped in and out of contact with gold to perform a corrosion test. The area ratio between gold and stainless steel in the case of contact was 1: 1. The corrosion rate was calculated from the weight change before and after the test, and the results are shown in Table 1. Thus, the corrosion rate of stainless steel by contacting gold is 1 in both type 304 steel and type 316 steel.
It became clear that it was about / 8.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【実施例２】９８ｗｔ％硫酸の４０℃の水溶液環境に、
炭素鋼を金と接触させた状態と接触しない状態で浸漬し
腐食試験を実施した。なお、接触した場合の金と炭素鋼
の面積比は、１：１であった。試験前後の重量変化から
腐食速度を算出し、結果を表２に示した。これより、金
を接触させることにより炭素鋼の腐食速度は、２／３程
度になることが明らかとなった。[Example 2] In an aqueous solution environment of 98 wt% sulfuric acid at 40 ° C,
The carbon steel was immersed in a state where it was brought into contact with gold and in a state where it was not brought into contact with it, and a corrosion test was performed. The area ratio between gold and carbon steel in the case of contact was 1: 1. The corrosion rate was calculated from the weight change before and after the test, and the results are shown in Table 2. From this, it became clear that the corrosion rate of carbon steel was reduced to about 2/3 by bringing gold into contact.
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【実施例３】シリカを分散させた９９．８ｗｔ％の濃硫
酸溶液を調整し、これにPPTA（ポリｐ−フェニレンテレ
フタルアミド）ポリマ−濃度が１１ｗｔ％になるように
溶解して、ポリマーの硫酸溶液を得た。（以降、このポ
リマーの硫酸溶液をドープと呼ぶ。）６０℃ドープ中に
２日間浸漬したところ、タイプ３１６ステンレス鋼は、
自然浸漬電位の振動現象をともなう全面腐食が発生し
た。Example 3 A 99.8 wt% concentrated sulfuric acid solution in which silica was dispersed was prepared, and dissolved therein so that the PPTA (poly p-phenylene terephthalamide) polymer concentration became 11 wt%. A solution was obtained. (Hereinafter, the sulfuric acid solution of this polymer is referred to as a dope.) When immersed in a 60 ° C. dope for 2 days, the type 316 stainless steel becomes
Corrosion occurred with the vibration phenomenon of spontaneous immersion potential.
【００２０】次に、同環境中でタイプ３１６製の焼結フ
ィルタに白金線を接触させた。フィルタの外形寸法は２
０ｍｍ角であるが、このフィルタの比表面積は１５０ｍ
2／ｍ2｛フィルタのガス吸着面積をもとにＢＥＴ法によ
り求め、濾過面積に対する表面積を、比表面積（ｍ2／
ｍ2）とした。ここで、濾過面積とは、ステンレス鋼フ
ィルタの溶液接触表面積ではなく、ステンレス鋼フィル
タの形状（リーフディスク、キャンドル、板状など）か
ら計算される濾過面積をいう。｝であるので、実際のス
テンレス鋼の表面積は６００００ｍｍ2であった。Next, a platinum wire was brought into contact with the type 316 sintered filter in the same environment. External dimensions of the filter are 2
Although it is 0 mm square, the specific surface area of this filter is 150 m
2 / m 2求 め Determined by the BET method based on the gas adsorption area of the filter, and the surface area with respect to the filtration area is calculated as the specific surface area (m 2 /
m 2 ). Here, the filtration area is not the solution contact surface area of the stainless steel filter but the filtration area calculated from the shape (leaf disk, candle, plate shape, etc.) of the stainless steel filter. Therefore, the actual surface area of stainless steel was 60000 mm 2 .
【００２１】また白金線の径は、０．８ｍｍであり、ス
テンレス鋼フィルタに接触しドープに浸漬された長さは
８０ｍｍであったので接触表面積は１２６ｍｍ2であっ
た。このため、ステンレス鋼と白金の面積比は、およそ
４８０：１であった。両者を接触した条件で、ドープ中
に２日間浸漬したが、自然浸漬電位の振動は生ぜず、ス
テンレス鋼フィルタに明確な腐食は認められなかった。
これより、ステンレス鋼に５００：１の面積比の貴金属
が接触すると、電位は安定し、腐食抑制効果のあること
が明らかになった。The diameter of the platinum wire was 0.8 mm, and the length of the platinum wire in contact with the stainless steel filter and immersed in the dope was 80 mm, so that the contact surface area was 126 mm 2 . Therefore, the area ratio between stainless steel and platinum was approximately 480: 1. Although the two were immersed in the dope for two days under the condition that they were in contact with each other, no oscillation of the spontaneous immersion potential occurred, and no clear corrosion was observed on the stainless steel filter.
From this, it has been clarified that when a noble metal having an area ratio of 500: 1 comes into contact with stainless steel, the potential is stabilized, and there is a corrosion inhibiting effect.
【００２２】[0022]
【発明の効果】本発明は、腐食性の大きい硫酸または硫
酸含有溶液を取り扱う装置において、炭素鋼またはタイ
プ３０４やタイプ３１６等の汎用ステンレス鋼の使用を
可能とし、しかも外部電源法のように複雑な付帯設備を
必要としない極めて優れた防食法である。The present invention makes it possible to use carbon steel or a general-purpose stainless steel such as type 304 or type 316 in an apparatus for handling highly corrosive sulfuric acid or a sulfuric acid-containing solution, and furthermore, it is complicated as in an external power supply method. It is an extremely excellent anticorrosion method that does not require any additional facilities.
Claims (3)
炭素鋼製装置またはステンレス鋼製装置の一部に貴金属
を接触またはイオンとして溶液中に共存させることを特
徴とする金属材料の腐食抑制方法。1. In a sulfuric acid or sulfuric acid-containing solution environment,
A method for suppressing corrosion of a metal material, comprising contacting a precious metal with a part of a carbon steel device or a stainless steel device or coexisting in a solution as ions.
０ｗｔ％以上の溶液であることを特徴とする、請求項１
記載の金属材料の腐食抑制方法。2. A sulfuric acid or sulfuric acid-containing solution having a sulfuric acid concentration of 7
2. The solution according to claim 1, wherein the solution is 0 wt% or more.
The method for suppressing corrosion of a metal material as described above.
貴金属が白金、金もしくは銀、またはこれらの１種以上
を含む合金であることを特徴とする請求項１または２記
載の金属材料の腐食抑制方法。3. The corrosion inhibition of a metal material according to claim 1, wherein the noble metal to be brought into contact with or coexisting in the solution is platinum, gold or silver, or an alloy containing at least one of these metals. Method.
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| JP2000345295A JP4565734B2 (en) | 2000-02-29 | 2000-11-13 | Method for inhibiting corrosion of metal materials |
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| JP4565734B2 JP4565734B2 (en) | 2010-10-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007095318A (en) * | 2005-09-27 | 2007-04-12 | Daido Steel Co Ltd | Anti-corrosion member, separator for fuel cell, and fuel cell |
| JP2015120954A (en) * | 2013-12-24 | 2015-07-02 | 日本電信電話株式会社 | Hydrogen intrusion prevention method |
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| JPS535043A (en) * | 1976-06-19 | 1978-01-18 | Hoechst Ag | Method of preventing corrosion of cast iron in boiled thick sulfuric acid |
| JPS55113884A (en) * | 1979-02-23 | 1980-09-02 | Hitachi Zosen Corp | Anodic corrosion protection method of acid cooler and electrode support device thereof |
| JPS5877580A (en) * | 1981-10-31 | 1983-05-10 | Hitachi Zosen Corp | Controlling method for potential in anodic protection |
| JPS6086557U (en) * | 1983-11-17 | 1985-06-14 | 日立造船株式会社 | Air-cooled anodic corrosion protection method sulfuric acid cooler |
| JPS627900A (en) * | 1985-07-02 | 1987-01-14 | Sumitomo Metal Ind Ltd | Method for supplying zinc ion to galvanizing bath |
| JPH04223300A (en) * | 1990-04-02 | 1992-08-13 | General Electric Co <Ge> | Method for elongating expected life of boiling water reactor |
| JPH09279313A (en) * | 1996-04-15 | 1997-10-28 | Sumitomo Metal Ind Ltd | Stainless steel for exhaust gas system of city waste incineration equipment |
| JPH10186085A (en) * | 1996-12-20 | 1998-07-14 | Toshiba Corp | Device and method for sticking noble metal to nuclear reactor structural material |
| JPH1129884A (en) * | 1997-07-10 | 1999-02-02 | Kimura Chem Plants Co Ltd | Corrosion protective surface treatment for stainless steel |
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2000
- 2000-11-13 JP JP2000345295A patent/JP4565734B2/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS535043A (en) * | 1976-06-19 | 1978-01-18 | Hoechst Ag | Method of preventing corrosion of cast iron in boiled thick sulfuric acid |
| JPS55113884A (en) * | 1979-02-23 | 1980-09-02 | Hitachi Zosen Corp | Anodic corrosion protection method of acid cooler and electrode support device thereof |
| JPS5877580A (en) * | 1981-10-31 | 1983-05-10 | Hitachi Zosen Corp | Controlling method for potential in anodic protection |
| JPS6086557U (en) * | 1983-11-17 | 1985-06-14 | 日立造船株式会社 | Air-cooled anodic corrosion protection method sulfuric acid cooler |
| JPS627900A (en) * | 1985-07-02 | 1987-01-14 | Sumitomo Metal Ind Ltd | Method for supplying zinc ion to galvanizing bath |
| JPH04223300A (en) * | 1990-04-02 | 1992-08-13 | General Electric Co <Ge> | Method for elongating expected life of boiling water reactor |
| JPH09279313A (en) * | 1996-04-15 | 1997-10-28 | Sumitomo Metal Ind Ltd | Stainless steel for exhaust gas system of city waste incineration equipment |
| JPH10186085A (en) * | 1996-12-20 | 1998-07-14 | Toshiba Corp | Device and method for sticking noble metal to nuclear reactor structural material |
| JPH1129884A (en) * | 1997-07-10 | 1999-02-02 | Kimura Chem Plants Co Ltd | Corrosion protective surface treatment for stainless steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007095318A (en) * | 2005-09-27 | 2007-04-12 | Daido Steel Co Ltd | Anti-corrosion member, separator for fuel cell, and fuel cell |
| JP2015120954A (en) * | 2013-12-24 | 2015-07-02 | 日本電信電話株式会社 | Hydrogen intrusion prevention method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4565734B2 (en) | 2010-10-20 |
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