JPS589973A - Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress - Google Patents

Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress

Info

Publication number
JPS589973A
JPS589973A JP10851081A JP10851081A JPS589973A JP S589973 A JPS589973 A JP S589973A JP 10851081 A JP10851081 A JP 10851081A JP 10851081 A JP10851081 A JP 10851081A JP S589973 A JPS589973 A JP S589973A
Authority
JP
Japan
Prior art keywords
stainless steel
corrosion
progress
stress
corrosion cracking
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.)
Pending
Application number
JP10851081A
Other languages
Japanese (ja)
Inventor
Keiji Ueno
植野　敬次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KANSAI METARIKON KOGYOSHO KK
Original Assignee
KANSAI METARIKON KOGYOSHO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KANSAI METARIKON KOGYOSHO KK filed Critical KANSAI METARIKON KOGYOSHO KK
Priority to JP10851081A priority Critical patent/JPS589973A/en
Publication of JPS589973A publication Critical patent/JPS589973A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

PURPOSE:To prevent the corrosion and stress corrosion cracking of stainless steel and to hinder their progress by spraying an Ni-Cr alloy contg. iron on the steel surface. CONSTITUTION:The surface of stainless steel is pretreated by shot or grit blasting to apply compressive stress and to roughen the surface. An Ni-Cr alloy contg. iron is then sprayed, and the pores are sealed with a sealing agent. The sprayed film has superior heat resistance, superior adhesive strength to the base metal and a superior buffer action to expansion and contraction, and is prevents the corrosion and stress corrosion cracking of the stainless steel and hinders their progress.

Description

【発明の詳細な説明】 本発明はステンレス鋼の腐食ならびに応力腐食割れ防止
および進行阻止法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing and inhibiting the corrosion and stress corrosion cracking of stainless steel.

ステンレス鋼製の構造物では孔食現象ならびに応力腐食
割れ現象が発生する場合が多く、その原因は、環境条件
や製作加工条件、機器設置の立地条件、迷走電流などが
か゛らんそ複線であし、その対策の研究は種々行われ、
応力除去のための熱処理の適用、腐食抑制剤の添加、　
ＰＲ調整、陰極防食、アルミクラツド材等の使用、さら
に環境遮断０たｌめのライニング法や不働態処理法の適
用、又は材質転換や機器の設計変更、プロセス変更、機
器増設等の改善策が検討されている巳ステンレス鋼の孔
食ならびに応力腐食割れの問題は設計段階で十分検討さ
れていても発生することが多く、定期検査時に発見され
て急いで対策を立てなければならないことも多い。Pitting corrosion and stress corrosion cracking often occur in stainless steel structures, and the causes are environmental conditions, manufacturing conditions, location conditions for equipment installation, stray current, etc. Various studies have been conducted on countermeasures,
Application of heat treatment for stress relief, addition of corrosion inhibitors,
Consideration of improvement measures such as PR adjustment, cathodic protection, use of aluminum clad materials, etc., application of lining methods and passive treatment methods for environmental protection, material change, equipment design changes, process changes, equipment expansion, etc. The problems of pitting corrosion and stress corrosion cracking in stainless steel often occur even if sufficient consideration is given at the design stage, and they are often discovered during periodic inspections and prompt countermeasures must be taken.

そこで、紙上のような実情に鑑み発明されたのが本発明
であり、その目的は、前処理としてショット及びグリッ
ドプラストによって表面に圧縮応力の付与と、粗面化を
行なった後、鉄を含有するニッケルクロム基合金を溶射
し、さらに封孔剤にて封孔処理を行なって、ステンレス
鋼の腐食ならびに応力腐食割れを防止およびその進行を
阻止する方法を提供するものである。Therefore, the present invention was invented in view of the actual situation as described on paper, and its purpose is to apply compressive stress to the surface and roughen it by shot and grid blasting as a pretreatment, and then apply iron-containing iron to the surface. The present invention provides a method for preventing corrosion and stress corrosion cracking of stainless steel and inhibiting their progress by thermally spraying a nickel-chromium-based alloy and sealing the stainless steel with a sealing agent.

以下に実施例を挙げて本発明のステンレス鋼の腐食なら
びに応力腐食割れ防止および進行阻止のための鉄を含有
するニッケルクロム基合金の溶射施工法を説明する。EXAMPLES The method of thermal spraying a nickel-chromium-based alloy containing iron for preventing corrosion and stress corrosion cracking of stainless steel and inhibiting the progression of stainless steel according to the present invention will be described below with reference to Examples.

実施例１ Ｎｉ　６６．０％　、　　Ｃｒ　１６．０％　、　　Ｓ
ｉ　１．５％　、Ｆｅ　１６．５ｆｌｒ実施例２ Ｎｉ　５４．０％、　Ｃｒ　１８．０％、　　Ｓｉ　１
．０９Ｇ　、　Ｆｅ　２７．Ｏ’ｌＡ炭素鋼の腐食なら
びに応力腐食割れ防止対策として、ブラスト施工後、ニ
ッケル基合金を溶射すると著しい防止効果を発揮するが
、ステンレス鋼の場合には鉄を１５％〜３０チ程度含有
したニッケルクロム基合金を溶射した方が優れた効果を
発揮する。該合金は比較的値段が安く、母材との密着性
、膨張収縮に対する緩衝性及び耐食性がよい。又使用中
の環境条件にもよるが、多くの実施例から見て該合金に
よる溶射皮膜は経時変化を起し、施工後１〜３年後に最
も安定な皮膜となる。使用条件に応じて該合金の溶射皮
膜の上に更にアルミニウム、アルミナ、チタニャ等の溶
射を行なうこともある。溶射皮膜中の気孔をなくするた
め封孔剤を用いて封孔処理をして、環境完全遮断膜とす
る。Example 1 Ni 66.0%, Cr 16.0%, S
i 1.5%, Fe 16.5flr Example 2 Ni 54.0%, Cr 18.0%, Si 1
．． 09G, Fe 27. As a measure to prevent corrosion and stress corrosion cracking of O'lA carbon steel, spraying a nickel-based alloy after blasting has a remarkable preventive effect, but in the case of stainless steel, nickel containing about 15% to 30% iron is used. Thermal spraying of a chromium-based alloy provides better results. This alloy is relatively inexpensive, has good adhesion to the base material, has good cushioning properties against expansion and contraction, and has good corrosion resistance. Furthermore, although it depends on the environmental conditions during use, many examples show that the thermal spray coating made of the alloy undergoes changes over time, and becomes the most stable coating 1 to 3 years after application. Depending on the conditions of use, aluminum, alumina, titania, etc. may be further thermally sprayed on the thermally sprayed coating of the alloy. In order to eliminate pores in the sprayed coating, a sealing agent is used to seal the coating, creating a complete environmental barrier coating.

斜上の如く本発明はステンレス鋼の表面に鉄を含有する
ニッケルクロム鋼を溶射することを特徴とするものであ
り、耐熱性、母材との密着性および膨張収縮に対する緩
衝性にすぐれた溶射皮膜によるステンレス鋼の腐食なら
びに応力腐食割れ防止および遜行阻止の改良方法である
。As shown above, the present invention is characterized by thermally spraying nickel-chromium steel containing iron onto the surface of stainless steel, and is thermal sprayed with excellent heat resistance, adhesion to the base material, and buffering properties against expansion and contraction. This is an improved method for preventing corrosion and stress corrosion cracking of stainless steel and preventing deterioration by using a film.

Claims (1)

【特許請求の範囲】[Claims] 鉄を含有するニッケルクロム基合金を溶射することを特
徴とするステンレス鋼の腐食ならびに応力腐食割れ防止
および進行阻止法。A method for preventing and inhibiting corrosion and stress corrosion cracking of stainless steel, which comprises thermally spraying a nickel-chromium based alloy containing iron.
JP10851081A 1981-07-11 1981-07-11 Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress Pending JPS589973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10851081A JPS589973A (en) 1981-07-11 1981-07-11 Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10851081A JPS589973A (en) 1981-07-11 1981-07-11 Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress

Publications (1)

Publication Number Publication Date
JPS589973A true JPS589973A (en) 1983-01-20

Family

ID=14486605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10851081A Pending JPS589973A (en) 1981-07-11 1981-07-11 Preventing method for corrosion and stress corrosion cracking of stainless steel and retardation for their progress

Country Status (1)

Country Link
JP (1) JPS589973A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583653A1 (en) * 1985-06-25 1986-12-26 Wiederaufarbeitung Von Kernbre ELEMENT, IN PARTICULAR CHEMICAL APPARATUS FOR AGGRESSIVE ENVIRONMENTS, HAVING A PLAIN-COATED WELD CORD
JP2012521526A (en) * 2009-03-24 2012-09-13 アルストム テクノロジー リミテッド Metal tube coating with fatigue corrosion cracking

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583653A1 (en) * 1985-06-25 1986-12-26 Wiederaufarbeitung Von Kernbre ELEMENT, IN PARTICULAR CHEMICAL APPARATUS FOR AGGRESSIVE ENVIRONMENTS, HAVING A PLAIN-COATED WELD CORD
JP2012521526A (en) * 2009-03-24 2012-09-13 アルストム テクノロジー リミテッド Metal tube coating with fatigue corrosion cracking

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