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DE401779C - Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust - Google Patents

Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust

Info

Publication number
DE401779C
DE401779C DEL49124D DEL0049124D DE401779C DE 401779 C DE401779 C DE 401779C DE L49124 D DEL49124 D DE L49124D DE L0049124 D DEL0049124 D DE L0049124D DE 401779 C DE401779 C DE 401779C
Authority
DE
Germany
Prior art keywords
iron
rust
exposed
protect
vessels
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
DEL49124D
Other languages
German (de)
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEL49124D priority Critical patent/DE401779C/en
Application granted granted Critical
Publication of DE401779C publication Critical patent/DE401779C/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00Electroplating: Baths therefor
    • C25D3/02Electroplating: Baths therefor from solutions
    • C25D3/56Electroplating: Baths therefor from solutions of alloys

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

Verfahren, die Innenwandungen eiserner Hohlkörper oder Gefäße, die wechselnden Temperaturen ausgesetzt sind, vor Rost zu schützen. Die wasserberührten Heizflächen von Dampfkesseln und Vorwärmern werden in der Regel durch den im Wasser meist vorhandenen Sauerstoff oder andere korrosive Wasserbestandteile in kürzerer oder längerer Zeit angegriffen. Die Anrostungenverursachen einerseits durch Schwächung der Gefäßwandungen eine Verringerung der Betriebssicherheit dieser meist mit hohem Druck arbeitenden Apparate, anderseits wird durch die schlecht leitende Oxydschicht die Wärmeübertragung der Heizfläche gestört. Man hat nun versucht, diesem Übel dadurch beizukommen, daß man das Wasser erst durch Filter mit Eisenspänen gehen ließ, in denen der Sauerstoff absorbiert wird. Derartige Filter können aber nur kurze Zeit ihren Zweck erfüllen. Man verwendet daher heute durchweg gußeiserne Vorwärmer, welche durch ihre dicken Wandungen eine große Sicherung gegen vorzeitiges Durchrosten bieten, obwohl Gußeisen im übrigen wegen seiner geringen Bruchfestigkeit ein sehr ungeeigneter Baustoff ist. Es liegt nun nahe, zur Herstellung von Vorwärmern Metalle zu verwenden, die nur schwach oder gar nicht korrodieren. Kupfer oder Bronze kommen des hohen Preises wegen als Baustoff im allgemeinen nicht in Betracht. Für Legierungen von Eisen mit Chrom, Mangan, Nickel,Wolfram,Molybdän usw., die an sich schwach oder gar nicht korrodieren, gilt das gleiche, ganz abgesehen von der Schwierigkeit der mechanischen Bearbeitung dieser sehr harten Legierungen.Process, the inner walls of iron hollow bodies or vessels that exposed to changing temperatures, protect from rust. The water-touched The heating surfaces of steam boilers and preheaters are usually in the water mostly existing oxygen or other corrosive water components in shorter attacked for a long time. The rusting is caused on the one hand by weakening the vessel walls a reduction in the operational reliability of this usually with a high level of Pressure working apparatus, on the other hand, is caused by the poorly conductive oxide layer the heat transfer of the heating surface is disturbed. One has now tried to avoid this evil to come to terms with the fact that the water was only allowed to go through filters with iron filings, in where the oxygen is absorbed. Such filters can only be used for a short time serve their purpose. Cast-iron preheaters are therefore used throughout today thanks to their thick walls, they offer a high level of protection against premature rusting through, although cast iron is otherwise a very unsuitable one because of its low breaking strength Building material is. It now makes sense to use metals to manufacture preheaters, which corrode only weakly or not at all. Copper or bronze come of the high Generally not considered as a building material due to the price. For alloys of Iron with chromium, manganese, nickel, tungsten, molybdenum, etc., which in themselves are weak or do not corrode at all, the same is true, quite apart from the difficulty of the mechanical processing of these very hard alloys.

Der Gedanke vorliegender Erfindung ist nun der, die wasserberührten Heizflächen eiserner Hohlkörper aller Art, wie Dampfkessel, Ekonomiser und ähnliche Gefäße, die zur Wärmeübertragung an sauerstoffhaltiges oder sonst korrosives Wasser dienen, durch einen Überzug mit einer Legierung aus Eisen und Chrom, Molybdän, Wolfram, Uran, Mangan, Kobalt und Nickel rostsicher zu machen.The idea of the present invention is that of those in contact with water Heating surfaces of iron hollow bodies of all kinds, such as steam boilers, economizers and the like Vessels used to transfer heat to oxygenated or otherwise corrosive water serve, by coating with an alloy of iron and chromium, molybdenum, tungsten, To make uranium, manganese, cobalt and nickel rustproof.

Mit lZücksicht auf die starken Temperaturschwankungen, denen die Heizflächen der Dampfkessel und Ekonomiser ausgesetzt sind., verbieten sich aus Haltbarkeitsgründen im allgemeinen Überzüge von anderen Metallen, da sie nicht den gleichen Ausdehnungskoeffizienten haben wie Eisen. Besonders geeignet hingegen sind Überzüge von Legierungen des Eisens mit den in Absatz 2 genannten Metallen, von denen bekannt ist, daß sie rostsicher sind und den gleichen Ausdehnungskoeffizienten wie das Eisen besitzen.Taking into account the strong temperature fluctuations caused by the heating surfaces the steam boiler and economizer are exposed, prohibit each other for reasons of durability generally coatings of other metals, as they do not have the same coefficient of expansion have like iron. On the other hand, coatings of iron alloys are particularly suitable with the metals mentioned in paragraph 2, which are known to be rustproof and have the same expansion coefficient as iron.

Versuche, ganz dünne elektrolytische Überzüge von derartigen Legierungen auf das Eisen zu bringen, haben ergeben, daß das Eisen alsdann vollkommen rostsicher ist und daß die Überzüge bei Temperaturwechseln vollkommen fest haften bleiben. Gute Resultate wurden vorzugsweise mit Überzügen einer Chromeisenlegierung erzielt. Als Elektrolyte wurden Lösungen von Salzen solcher Metalle 'verwandt, deren Eisenlegierungen man niederzuschlagen wünscht. Die Lösungen müssen ziemlich konzentriert sein, um gute Resultate zu erzielen. Bei Verwendung von Chromsäureanhydrid haben sich 31a-Lösungen als völlig geeignet erwiesen. Noch höhere Konzentrationen sind jedoch in steigendern-Mäß:e:geeignet. Als Anoden wurden Eisendrähte oder Eisenstäbe verwandt. Es ist dies das einfachste Mittel, um auf dem kathodischen Eisen Niederschläge von Eisenlegierungen zu erhalten. Man kann natürlich denselben Effekt dadurch erreichen, daß man bei Verwendung indifferenter Anoden oder von Anoden aus Chrom, Mangan usw. oder Legierungen dieser Metalle mit Eisen gemischte Elektrolyte, die außer den Chrom,- Mangan- usw. Salzen auch Eisensalze enthalten, anwendet.Try very thin electrolytic coatings on such alloys on the iron have shown that the iron is then completely rustproof and that the coatings adhere perfectly when the temperature changes. Good results have preferably been achieved with coatings of a chrome iron alloy. Solutions of salts of such metals, their iron alloys, were used as electrolytes one wishes to strike down. The solutions have to be pretty focused in order to achieve good results. When using chromic anhydride have 31a solutions proved perfectly suitable. However, even higher concentrations are suitable in increasing proportions. Iron wires or iron rods were used as anodes. This is the easiest Means for obtaining iron alloy deposits on the cathodic iron. You can of course achieve the same effect by using more indifferent Anodes or of anodes made of chromium, manganese, etc. or alloys of these metals with Iron mixed electrolytes which, in addition to the chromium, manganese etc. salts, also contain iron salts included, applies.

Zu bemerken ist noch, daß die Vornahme der Elektrolyse bei höheren Temperaturen zweckmäßig, wenn auch nicht unbedingt erforderlich ist.It should also be noted that electrolysis is carried out at higher levels Temperatures useful, if not absolutely necessary.

Claims (1)

PATENT- ANSPRUCFI: Verfahren, die Innenwandungen eiserner Hohlkörper, die wechselnden Temperaturen ausgesetzt sind, dadurch vor Rost zu schützen, daß man sie elektrolytisch mit Niederschlägen von rostsicheren Legierungen des Eisens mit Chrom, Molybdän, Wolfram, Uran, Mangan, Kobalt und Nickel überzieht. PATENT APPLICATION: Process to protect the inner walls of hollow iron bodies, which are exposed to changing temperatures, from rust by coating them electrolytically with deposits of rust-proof iron alloys with chromium, molybdenum, tungsten, uranium, manganese, cobalt and nickel.
DEL49124D 1919-10-24 1919-10-24 Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust Expired DE401779C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL49124D DE401779C (en) 1919-10-24 1919-10-24 Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL49124D DE401779C (en) 1919-10-24 1919-10-24 Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust

Publications (1)

Publication Number Publication Date
DE401779C true DE401779C (en) 1924-09-09

Family

ID=7272804

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL49124D Expired DE401779C (en) 1919-10-24 1919-10-24 Process to protect the inner walls of iron hollow bodies or vessels that are exposed to changing temperatures from rust

Country Status (1)

Country Link
DE (1) DE401779C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019203463A1 (en) * 2019-03-14 2020-09-17 Robert Bosch Gmbh Method for manufacturing a component subjected to internal pressure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019203463A1 (en) * 2019-03-14 2020-09-17 Robert Bosch Gmbh Method for manufacturing a component subjected to internal pressure

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