DE605182C - Process to protect chromium-nickel steels from attack by acids - Google Patents

Process to protect chromium-nickel steels from attack by acids

Info

Publication number
DE605182C
DE605182C DE1930605182D DE605182DD DE605182C DE 605182 C DE605182 C DE 605182C DE 1930605182 D DE1930605182 D DE 1930605182D DE 605182D D DE605182D D DE 605182DD DE 605182 C DE605182 C DE 605182C
Authority
DE
Germany
Prior art keywords
acids
attack
steel
chromium
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
Application number
DE1930605182D
Other languages
German (de)
Inventor
Dr Alfred Curs
Dr Georg Pfleiderer
Dr Hugo Widmann
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Application granted granted Critical
Publication of DE605182C publication Critical patent/DE605182C/en
Expired 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
    • 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
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/04—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids

Description

Verfahren, Chromnickelstähle vor dem Angriff von Säuren zu schützen Es wurde gefunden, daß beim Arbeiten mit Säuren der Angriff der letzteren auf Chrom und Nickel enthaltende Stähle, die beispielsweise als Gefäßmaterial mit den Säuren in Berührung kommen, bedeutend vermindert wird, wenn man den Säuren einen Quecksilbergehalt erteilt, z. B. ein Quecksilbersalz zusetzt. Gelöste Menge des Stahles in mg pro qcm Oberfläche und Stunde Material Säure Konzentration Temperatur ohne mit s 0/" des Hg-Zusatz betr. Hgli- Salzes V 2 A-Stahl . . . . : . . . Sohwefelsäure g6o/oig Siedetemperatur vollständig , o,ooi aufgelöst V 2 A-Stahl . . . . . . . . Schwefelsäure 2oo/oig 9o° vollständig 0,000 aufgelöst V2A-Stahl........ Schwefelsäure 2oo/oig Siedetemperatur vollständig 0,058 (entgütet) aufgelöst V4A-Stahl........ Schwefelsäure i5%ig 9o° 23,43 0,000 V4A-Stahl........ Phosphorsäure 66%ig 12o° 0,73 o,io V2A-Stahl........ Essigsäure konzentriert- 12o° 0,050 0,000 V4A-Stahl........ Essigsäure konzentriert 12o° o,o6o o,ooo Hauptbestandteile der benutzten Chromnickelstähle Fe Cr Ni Mo C V2A-Stahl . . . . . . . . 70,8 % 20,3% 7,1 0/0 - 0,9-7'/o V4A-Stahl . . . . . . . . 6g,3 0/0 19,2 % 7,i7 % 2,55 0/0 0,42 % Der Quecksilbergehalt der Säure kann sehr gering sein, beispielsweise o,2% betragen, was übrigens in manchen Fällen schon durch die Schwerlöslichkeit der betreffenden Quecksilbersalze bedingt ist. Vielfach genügt es, wenn die Säure mit metallischem Quecksilber in Berührung steht, wobei dieses das zu schützende Metall nicht zu berühren braucht. Die Schutzwirkung des Quecksilbersalzes tritt in manchen Fällen auch dann noch zutage, wenn man auf den Stahl nach seiner Behandlung mit der quecksilberhaltigen Säure eine Säure einwirken läßt, die kein Quecksilber enthält; die Beständigkeit des Stahles gegenüber der Säure, ist dann in manchen Fällen erheblich größer als die eines nicht vorbehandelten Stahles.Method of protecting chromium-nickel steels from attack by acids It has been found that when working with acids, the attack of the latter on steels containing chromium and nickel, which come into contact with the acids as vessel material, for example, is significantly reduced if the acids are combined Mercury content granted, z. B. adds a mercury salt. Dissolved amount of steel in mg per square cm of surface and hour Material acid concentration temperature without with s 0 / " des Hg addition regarding Hgli- Salt V 2 A steel. . . . :. . . Sulfuric acid g60 / oig boiling point complete, o, ooi dissolved V 2 A steel. . . . . . . . Sulfuric acid 2oo / oig 90 ° completely 0.000 dissolved V2A steel ........ sulfuric acid 2oo / oig boiling point completely 0.058 (remunerated) dissolved V4A steel ........ sulfuric acid i5% 90 ° 23.43 0.000 V4A steel ........ phosphoric acid 66% ig 12o ° 0.73 o, io V2A steel ........ Acetic acid concentrated - 12o ° 0.050 0.000 V4A steel ........ Acetic acid concentrated 12o ° o, o6o o, ooo Main components of the chromium-nickel steels used Fe Cr Ni Mo C V2A steel. . . . . . . . 70.8 % 20.3% 7.1 0/0 - 0.9-7 '/ o V4A steel. . . . . . . . 6g, 3 0/0 19.2% 7, i7 % 2.55 0/0 0.42% The mercury content of the acid can be very low, for example 0.2%, which incidentally in some cases is due to the poor solubility of the mercury salts in question. In many cases it is sufficient if the acid is in contact with metallic mercury, which does not need to touch the metal to be protected. The protective effect of the mercury salt is still evident in some cases if an acid which does not contain mercury is allowed to act on the steel after it has been treated with the mercury-containing acid; the resistance of the steel to the acid is then in some cases considerably greater than that of a steel that has not been pretreated.

Die Wirkung der vorliegenden Erfindung wird durch die vorstehenden Versuche veranschaulicht, die mit verschiedenen Chromnickelstählen mit oder ohne Zusatz von Quecksilber zu verschiedenen Säuren durchgeführt wurden. Die Behandlungsdauer betrug in allen Fällen 48 Stunden, die Dicke der dem Angriff der Säuren ausgesetzten Stahlplättchen a1/2 mm.The effect of the present invention is demonstrated by the above Experiments demonstrated using different chromium-nickel steels with or without Additions of mercury to various acids have been carried out. The duration of treatment in all cases was 48 hours, the thickness of the exposed to the attack of the acids Steel plate a1 / 2 mm.

Gegen Salpetersäure sind Chromnickelstähle, besonders solche mit höheren Chromgehalten, weitgehend beständig, so daß sich für diesen Fall ein Zusatz von Quecksilber durchweg erübrigt. Salzsäure ist die einzige Chromnickelstähle angreifende Säure, bei der ein Zusatz von Quecksilber nicht korrosionshemmend wirktChrome-nickel steels, especially those with higher ones, are against nitric acid Chromium content, largely stable, so that in this case an addition of There is no need for mercury throughout. Hydrochloric acid is the only one that attacks chromium-nickel steels Acid, in which the addition of mercury does not have a corrosion-inhibiting effect

Claims (1)

PATENTANSPRUCH: Verfahren, Chromnickelstähle vor dem Angriff von Säuren, mit Ausnahme von Salzsäure, zu schützen, dadurch gekennzeichnet, daß man den Säuren einen Quecksilbergehalt erteilt. PATENT CLAIM: Process to protect chromium-nickel steels from attack by acids, with the exception of hydrochloric acid, characterized in that the acids are given a mercury content.
DE1930605182D 1930-03-27 1930-03-27 Process to protect chromium-nickel steels from attack by acids Expired DE605182C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE605182T 1930-03-27

Publications (1)

Publication Number Publication Date
DE605182C true DE605182C (en) 1934-11-06

Family

ID=6575320

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930605182D Expired DE605182C (en) 1930-03-27 1930-03-27 Process to protect chromium-nickel steels from attack by acids

Country Status (1)

Country Link
DE (1) DE605182C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355089A1 (en) * 1976-06-19 1978-01-13 Hoechst Ag PROCESS FOR PROTECTING CAST IRON AGAINST CORROSION BY BOILING CONCENTRATED SULFURIC ACID

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355089A1 (en) * 1976-06-19 1978-01-13 Hoechst Ag PROCESS FOR PROTECTING CAST IRON AGAINST CORROSION BY BOILING CONCENTRATED SULFURIC ACID

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