EP0206386B1 - Bains et procédé pour le polissage chimique de surfaces en acier inoxydable - Google Patents

Bains et procédé pour le polissage chimique de surfaces en acier inoxydable Download PDF

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Publication number
EP0206386B1
EP0206386B1 EP86200920A EP86200920A EP0206386B1 EP 0206386 B1 EP0206386 B1 EP 0206386B1 EP 86200920 A EP86200920 A EP 86200920A EP 86200920 A EP86200920 A EP 86200920A EP 0206386 B1 EP0206386 B1 EP 0206386B1
Authority
EP
European Patent Office
Prior art keywords
per litre
bath
moles
baths
acid
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 - Lifetime
Application number
EP86200920A
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German (de)
English (en)
French (fr)
Other versions
EP0206386A1 (fr
Inventor
Daniel Tytgat
Pierre Lefevre
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.)
Solvay SA
Original Assignee
Solvay SA
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Filing date
Publication date
Application filed by Solvay SA filed Critical Solvay SA
Priority to AT86200920T priority Critical patent/ATE55419T1/de
Publication of EP0206386A1 publication Critical patent/EP0206386A1/fr
Application granted granted Critical
Publication of EP0206386B1 publication Critical patent/EP0206386B1/fr
Anticipated expiration legal-status Critical
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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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F3/00—Brightening metals by chemical means
    • C23F3/04—Heavy metals
    • C23F3/06—Heavy metals with acidic solutions

Definitions

  • the present invention relates to the composition of baths for the chemical polishing of stainless steel surfaces.
  • Chemical polishing of metal surfaces is a well-known technique (electrolytic and chemical polishing of metals - W.J. Mc G. TEGART - Dunod - 1960 - p. 122 et seq.); it consists of treating the metal surfaces to be polished with baths of mineral acids.
  • baths are generally used comprising a mixture, in aqueous solution, of hydrochloric, phosphoric and nitric acids (patent US-A-2662814).
  • suitable additives such as surfactants, viscosity regulators and brighteners.
  • a composition of a bath for the chemical polishing of stainless steel surfaces comprising, in aqueous solution, a mixture of phosphoric acid, nitric acid and d hydrochloric acid, a viscosity regulator chosen from water-soluble polymers, a surfactant and sulfosalicylic acid as a brightening agent.
  • This known polishing bath has proven to be very effective. However, it has the disadvantage of containing several organic additives, which add to the cost, complicate its implementation and constitute a source of pollution during the rejection of the spent bath.
  • Document FR-A-2463820 discloses chemical polishing baths comprising a mixture of hydrochloric, nitric and phosphoric acids and a thiourea. It teaches that thiourea has the function of accelerating the speed of chemical polishing.
  • the present invention aims to remedy the aforementioned drawbacks of known polishing baths, by providing bath compositions for the chemical polishing of austenitic stainless steel surfaces, in particular steel alloyed with chromium and nickel, which avoid setting works with multiple additives and produces excellent quality polishes, especially in the case where the surface area to be polished is very high compared to the space available for the bath.
  • the invention therefore relates to baths for the chemical polishing of stainless steel surfaces, comprising, in aqueous solution, a mixture of hydrochloric acid, phosphoric acid and nitric acid; according to the invention, the baths comprise in the aqueous solution, ferricyanide complex ions and an additive capable of breaking down nitrous acid.
  • the ferricyanide complex ions are complex cyanides of general formula Fe III (CN) 6 3-, also called hexacyanoferrates (III) (Encyclopedia of Chemical Technology - Kirk Othmer - John Wiley & Sons, Inc. -1967 - Vol. 12 - pages 25, 26, 31, 32). They can be present in the aqueous solution in the form of all dissolved compounds such as, for example, hexacyanoferric acid (111), ammonium ferricyanide and ferricyanides of alkali and alkaline earth metals. Preferred compounds are the alkali metal ferricyanides, potassium ferricyanide being especially recommended.
  • the additive capable of decomposing nitrous acid has the function of decomposing at least part of the nitrous acid which is formed during the polishing of a steel surface, the nitrous acid being the consequence of an oxidation of ferrous ions released into the bath during polishing.
  • the additive can be chosen from all organic and inorganic substances which are capable of breaking down nitrous acid in an aqueous medium; it should be chosen from among the substances which do not attack the polishing steel and for which the products of the reaction with nitrous acid do not attack the polishing steel. Preference is given to substances which are soluble in the aqueous solution containing the mixture of acids.
  • Sulfuric acid, hydroxylamine, hydrazine, hydrogen peroxide, acetone, urea and primary, secondary and tertiary amines are examples of substances which can be used for the bath additive according to the invention. 'invention.
  • the nitrogen compounds constitute a class of substances which are especially advantageous for the bath additive according to the invention; examples of nitrogen compounds are urea and its derivatives, in particular thiourea and ureines.
  • Urea is a preferred nitrogen compound, according to the invention.
  • the respective contents of phosphoric acid, hydrochloric acid, nitric acid and, in ferricyanide complex ions are chosen according to the nature of the metal treated, the working temperature and the desired duration for the trai polishing.
  • the content of additive capable of breaking down nitrous acid depends on various parameters, such as the nature of said additive, the respective contents of hydrochloric acid, phosphoric acid, nitric acid and ferricyanide complex ions, the volume of the bath used. , the configuration of the metal surface to be polished and the nature of the metal. It has been found that, all other things remaining equal, the optimum content of additive in the polishing baths according to the invention is proportional to the depth of attack of the bath in the metal and to the ratio between the area of the metal surface to polish and the volume of the bath used.
  • Preferred baths are those which are essentially free of alkylpyridinium chloride, alkylphenol and cellulose ether.
  • a great advantage of the polishing baths according to the invention lies in their ability, after adaptation of the respective concentrations of their constituents, to carry out polishing at moderate speed of action, which can be distributed over several hours, so as to allow uniform polishing.
  • large surfaces or hard to reach surfaces They are especially well suited for polishing metal surfaces with a very large area, compared to the space available for the bath.
  • they find an interesting application for the polishing of metal surfaces whose area (expressed in m 2 ) is at least equal to 3 times, preferably greater than 8 times the volume (expressed in m 3 ) of the polishing bath which is in contact with it, such as, for example, heat exchangers with a very large exchange surface.
  • the performance of the baths according to the invention is not limited by a maximum value of the ratio between the area of the surface to be polished and the volume of the bath used, this ratio, expressed in m ⁇ 1 , which can for example reach 20 and more.
  • the baths according to the invention are suitable for polishing all austenitic stainless steel surfaces. They find a particularly advantageous application in the polishing of austenitic stainless steels alloyed with chromium and nickel, in particular those containing between 12 and 26% of chromium and between 6 and 22% of nickel, such as steels 18/8 and 18/10 , for example.
  • the invention therefore also relates to a method for polishing a stainless steel surface, according to which the surface is brought into contact with a chemical polishing bath according to the invention.
  • a prefabricated bath can be used, in contact with which the metal surface to be polished is then placed.
  • nitric acid and additive capable of decomposing nitrous acid
  • several successful additions can be made sifs or a continuous addition of nitric acid and said additive, as the polishing progresses.
  • the bath is carried out in situ in contact with the metal surface to be polished.
  • the metal surface is first brought into contact with an aqueous solution containing hydrochloric acid, phosphoric acid, nitric acid and the additive capable of decomposing nitrous acid, then the ions are added. ferricyanide complexes to the solution, while it is in contact with the metal surface.
  • the contact time of the surface to be polished with the bath must be sufficient to achieve effective polishing of the surface; however, it cannot exceed a critical value beyond which local corrosion may appear on the surface, unless additional nitric acid and an additive capable of decomposing nitrous acid are added in accordance with to the particular embodiment of the method, described above.
  • the optimum contact time of the surface to be polished with the bath or the importance of the additional addition of nitric acid and additive capable of breaking down nitrous acid depend on many parameters such as the composition of the steel of the surface to be polished, its initial configuration and roughness, the composition of the bath, the working temperature, the possible turbulence of the bath in contact with the surface, the ratio between the area of the metal surface to be polished and the volume of the bath used; it must be determined in each particular case by routine laboratory work.

Landscapes

  • 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)
  • ing And Chemical Polishing (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Electronic Switches (AREA)
  • Control Of El Displays (AREA)
  • Color Television Systems (AREA)
EP86200920A 1985-06-03 1986-05-27 Bains et procédé pour le polissage chimique de surfaces en acier inoxydable Expired - Lifetime EP0206386B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86200920T ATE55419T1 (de) 1985-06-03 1986-05-27 Loesungen und verfahren zum chemischen polieren von oberflaechen von rostfreien stahlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508440A FR2582675B1 (fr) 1985-06-03 1985-06-03 Bains et procedes pour le polissage chimique de surfaces en acier inoxydable
FR8508440 1985-06-03

Publications (2)

Publication Number Publication Date
EP0206386A1 EP0206386A1 (fr) 1986-12-30
EP0206386B1 true EP0206386B1 (fr) 1990-08-08

Family

ID=9319874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86200920A Expired - Lifetime EP0206386B1 (fr) 1985-06-03 1986-05-27 Bains et procédé pour le polissage chimique de surfaces en acier inoxydable

Country Status (14)

Country Link
US (1) US4678541A (ko)
EP (1) EP0206386B1 (ko)
JP (1) JPH072993B2 (ko)
KR (1) KR930003606B1 (ko)
AT (1) ATE55419T1 (ko)
AU (1) AU579474B2 (ko)
BR (1) BR8602514A (ko)
CA (1) CA1298762C (ko)
DE (1) DE3673258D1 (ko)
ES (1) ES8704554A1 (ko)
FI (1) FI81611C (ko)
FR (1) FR2582675B1 (ko)
NO (1) NO168716C (ko)
PT (1) PT82676B (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1003579A3 (fr) * 1989-10-26 1992-04-28 Solvay Bains et procede pour le polissage chimique de surfaces en acier inxoydable.
BE1004452A3 (fr) * 1990-06-19 1992-11-24 Solvay Bains et procede pour le polissage chimique de surfaces en acier inoxydable.
US5215676A (en) * 1992-09-14 1993-06-01 Stone John A Rust and stain removal composition
US5279707A (en) * 1992-10-23 1994-01-18 Time Savers Die discoloration remover solution and method
FR2717829B1 (fr) * 1994-03-28 1996-05-24 Solvay Bains et procédé pour le polissage chimique de surfaces en acier inoxydable.
US5512201A (en) * 1995-02-13 1996-04-30 Applied Chemical Technologies, Inc. Solder and tin stripper composition
US20040134873A1 (en) * 1996-07-25 2004-07-15 Li Yao Abrasive-free chemical mechanical polishing composition and polishing process containing same
DE69734868T2 (de) * 1996-07-25 2006-08-03 Dupont Air Products Nanomaterials L.L.C., Tempe Zusammensetzung und verfahren zum chemisch-mechanischen polieren
US20040140288A1 (en) * 1996-07-25 2004-07-22 Bakul Patel Wet etch of titanium-tungsten film

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2662814A (en) * 1949-08-27 1953-12-15 Diversey Corp Method and composition for chemically polishing metals
GB1108590A (en) * 1965-10-11 1968-04-03 Cowles Chem Co Process of protecting metal surfaces and compositions therefor
GB1126305A (en) * 1967-06-08 1968-09-05 Summers & Sons Ltd John Improvements in or relating to methods of pickling ferrous metals
US3709824A (en) * 1971-01-07 1973-01-09 Nippon Soda Co Method and composition for chemical polishing of stainless steel surfaces
US3953263A (en) * 1973-11-26 1976-04-27 Hitachi, Ltd. Process for preventing the formation of nitrogen monoxide in treatment of metals with nitric acid or mixed acid
AU6136480A (en) * 1979-08-24 1981-02-26 Diversey Corporation Chemical polishing stainless steel
FR2465010A1 (fr) * 1979-09-17 1981-03-20 Solvay Procede pour inhiber la corrosion d'une installation metallique au contact d'un bain acide
PL137973B1 (en) * 1983-05-19 1986-08-30 Akad Gorniczo Hutnicza Agent for chemically polishing brasses

Also Published As

Publication number Publication date
JPS6237381A (ja) 1987-02-18
NO168716C (no) 1992-03-25
FI81611C (fi) 1990-11-12
NO862175L (no) 1986-12-04
AU5808886A (en) 1986-12-11
EP0206386A1 (fr) 1986-12-30
AU579474B2 (en) 1988-11-24
FI862361A0 (fi) 1986-06-03
NO168716B (no) 1991-12-16
DE3673258D1 (de) 1990-09-13
KR870000451A (ko) 1987-02-18
FI81611B (fi) 1990-07-31
JPH072993B2 (ja) 1995-01-18
BR8602514A (pt) 1987-01-27
NO862175D0 (no) 1986-06-02
KR930003606B1 (ko) 1993-05-08
FI862361A (fi) 1986-12-04
ES555583A0 (es) 1987-04-01
PT82676B (pt) 1988-07-01
FR2582675A1 (fr) 1986-12-05
ES8704554A1 (es) 1987-04-01
ATE55419T1 (de) 1990-08-15
CA1298762C (fr) 1992-04-14
FR2582675B1 (fr) 1992-10-02
US4678541A (en) 1987-07-07
PT82676A (fr) 1986-06-01

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