EP3269844A1 - Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation - Google Patents

Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation Download PDF

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Publication number
EP3269844A1
EP3269844A1 EP16178915.1A EP16178915A EP3269844A1 EP 3269844 A1 EP3269844 A1 EP 3269844A1 EP 16178915 A EP16178915 A EP 16178915A EP 3269844 A1 EP3269844 A1 EP 3269844A1
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EP
European Patent Office
Prior art keywords
cleaning solution
carbon atom
aqueous cleaning
blacking
mol
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.)
Ceased
Application number
EP16178915.1A
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German (de)
English (en)
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
Beratherm AG
Original Assignee
Beratherm AG
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 Beratherm AG filed Critical Beratherm AG
Priority to EP16178915.1A priority Critical patent/EP3269844A1/fr
Publication of EP3269844A1 publication Critical patent/EP3269844A1/fr
Ceased legal-status Critical Current

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    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/088—Iron or steel solutions containing organic acids

Definitions

  • the present invention relates to an aqueous cleaning solution for removing blacking deposits on media-contacting surfaces of stainless steels according to the preamble of claim 1. Furthermore, the invention relates to a use of the inventive cleaning solution.
  • Rouging a yellow, red to black violet, often reddish brown to rust-colored surface discoloration
  • Blacking forms in pure steam systems with increasing operating time in low-oxygen atmospheres. These matt black coverings are largely adherent magnetite layers (Fe 3 O 4 ), which can grow up as chalky surface structures. In the advanced stage morbid surface coverings are then observed, and it can come increasingly to unwanted particle detachment.
  • the object of the present invention was therefore to provide an improved aqueous cleaning solution for removing blacking deposits Media-contacting surfaces of stainless steels. Further objects of the invention are the specification of a use for the preparation of the inventive cleaning solution.
  • the above data in mol% relate to the total of the active component.
  • the above information in mol / kg refer to the entirety of the cleaning solution.
  • the optionally present third carbon atom is present as methylene group CH 2 or as ethylidene group CHCH 3 or as isopropylidene group C (CH 3 ) 2 .
  • composition defined above can provide a highly effective debolking solution for media-contacting surfaces of stainless steels.
  • this deblacking solution consists of environmentally friendly and inexpensive substances.
  • Magnetite contains predominantly Fe III in trivalent form, therefore should be oxidized from saving of reaction energy primarily by an oxidizing agent divalent iron. As a result, the structure of the spinel lattice decays. By Complexation of all trivalent iron by selected bidentate complexing agents dissolves the spinel structure of the magnetite. The dissolution can be accelerated by additions of fluoride ions, since this complex formation is the fastest, but these are not the most stable complexes of iron.
  • the inventive aqueous solution is not only very effective, but it can also be made from inexpensive and environmentally friendly substances. It is also advantageous that it has a positive electrochemical potential and, accordingly, has a passivating effect. This eliminates the need for an additional passivation step, such as that required for neutral derouging.
  • the organic acid is selected from the group consisting of oxalic acid, malonic acid, glycolic acid and 3-hydroxypropionic acid.
  • the organic acid is oxalic acid (claim 2).
  • the oxidizing agent is hydrogen peroxide (claim 3).
  • the inorganic fluoride is ammonium bifluoride (claim 4).
  • oxalic acid is usually present as a dihydrate (C 2 H 2 O 4 .2H 2 O) with a molecular weight of 126.07 g / mol, which must be taken into account in the initial weighing.
  • a weight fraction of about 3 wt .-% 0-xalklaihydrat is included instead of the above-mentioned content of about 2.1 wt .-% of anhydrous oxalic acid.
  • H 2 O 2 content of the for the preparation of the inventive Cleaning solution used H 2 O 2 solution is to be considered when weighing.
  • Another aspect of the invention relates to the use of the cleaning solution according to the invention for removing blacking deposits on media-contacting surfaces of stainless steels selected from the group of chromium / nickel and chromium / nickel / molybdenum steels (claim 7).
  • the use of the aqueous cleaning solution for the removal of Blackingbelägen with a layer thickness of 0.1 .mu.m to 10 .mu.m (claim 8).
  • the oxidizing agent is added to the residual salt solution only immediately before the beginning of the process, since unwanted decomposition of the oxidizing agent would occur during storage of the finished cleaning solution.
  • the cleaning solution should be protected from sunlight and other heat.
  • w (x) represents the mass fraction of component x in the added species;
  • oxalic acid dihydrate contains 71.42% by weight of non-hydrated oxalic acid.
  • a filtration of the solution is carried out in accordance with the applicable GMP guidelines with regard to fully dissociated substances.
  • the oxidizing agent here hydrogen peroxide
  • the components 1 to 3 are mixed in advance and stored the solution.
  • the finished process solution is then provided on site by addition of component 4.
  • the cleaning solution is not corrosive and therefore no inhibitor to protect the stainless steel surface was required.
  • the cleaning solution thus selectively dissolves thin layers of magnetite from a stainless steel surface both by spraying and dipping.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Detergent Compositions (AREA)
EP16178915.1A 2016-07-11 2016-07-11 Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation Ceased EP3269844A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16178915.1A EP3269844A1 (fr) 2016-07-11 2016-07-11 Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16178915.1A EP3269844A1 (fr) 2016-07-11 2016-07-11 Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation

Publications (1)

Publication Number Publication Date
EP3269844A1 true EP3269844A1 (fr) 2018-01-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16178915.1A Ceased EP3269844A1 (fr) 2016-07-11 2016-07-11 Solution de nettoyage aqueuse destinée à éliminer des couches de noir de fonderie sur des surfaces d'aciers inoxydables en contact avec des fluides , son utilisation

Country Status (1)

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EP (1) EP3269844A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020192731A1 (fr) * 2019-03-26 2020-10-01 高瑞安 Solution de traitement double usage destinée à l'élimination d'huile d'un alliage d'aluminium et au polissage de ce dernier, et procédé d'élimination d'huile d'un alliage d'aluminium et de polissage de ce dernier
EP3851558A1 (fr) * 2020-01-14 2021-07-21 Beratherm AG Solution aqueuse de nettoyage permettant d'éliminer les couches noircissantes et/ou les couches rugueuses sur des surfaces d'acier inoxydable en contact avec le fluide et utilisation correspondante

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1483146A (fr) * 1965-06-11 1967-06-02 Borg Holding A G Procédé pour traiter les surfaces de métaux pour les décontaminer, et installations métalliques traitées par ledit procédé
GB1209016A (en) * 1969-06-09 1970-10-14 Lancy Lab Chemical brightening of iron-containing surfaces of work pieces
EP0596273A1 (fr) * 1992-11-02 1994-05-11 POLIGRAT Holding GmbH Produits de décapage de surfaces d'aciers au chromenickel ou d'aciers du chrome et leur utilisation
JP4125953B2 (ja) * 2000-07-11 2008-07-30 荏原工業洗浄株式会社 原子力プラント内で発生する金属廃棄物の表面処理剤及び方法並びに化学的研削装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1483146A (fr) * 1965-06-11 1967-06-02 Borg Holding A G Procédé pour traiter les surfaces de métaux pour les décontaminer, et installations métalliques traitées par ledit procédé
GB1209016A (en) * 1969-06-09 1970-10-14 Lancy Lab Chemical brightening of iron-containing surfaces of work pieces
EP0596273A1 (fr) * 1992-11-02 1994-05-11 POLIGRAT Holding GmbH Produits de décapage de surfaces d'aciers au chromenickel ou d'aciers du chrome et leur utilisation
JP4125953B2 (ja) * 2000-07-11 2008-07-30 荏原工業洗浄株式会社 原子力プラント内で発生する金属廃棄物の表面処理剤及び方法並びに化学的研削装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020192731A1 (fr) * 2019-03-26 2020-10-01 高瑞安 Solution de traitement double usage destinée à l'élimination d'huile d'un alliage d'aluminium et au polissage de ce dernier, et procédé d'élimination d'huile d'un alliage d'aluminium et de polissage de ce dernier
EP3851558A1 (fr) * 2020-01-14 2021-07-21 Beratherm AG Solution aqueuse de nettoyage permettant d'éliminer les couches noircissantes et/ou les couches rugueuses sur des surfaces d'acier inoxydable en contact avec le fluide et utilisation correspondante

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