EP0602680A1 - Verschlussdichtung enthaltend Kaliumsilicate - Google Patents

Verschlussdichtung enthaltend Kaliumsilicate Download PDF

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Publication number
EP0602680A1
EP0602680A1 EP93120451A EP93120451A EP0602680A1 EP 0602680 A1 EP0602680 A1 EP 0602680A1 EP 93120451 A EP93120451 A EP 93120451A EP 93120451 A EP93120451 A EP 93120451A EP 0602680 A1 EP0602680 A1 EP 0602680A1
Authority
EP
European Patent Office
Prior art keywords
potassium silicate
molten
molten zinc
sealant
zinc
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.)
Withdrawn
Application number
EP93120451A
Other languages
English (en)
French (fr)
Inventor
Sasaki Satoshi
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.)
Praxair ST Technology Inc
Praxair Technology Inc
Original Assignee
Praxair ST Technology Inc
Praxair Technology Inc
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 Praxair ST Technology Inc, Praxair Technology Inc filed Critical Praxair ST Technology Inc
Publication of EP0602680A1 publication Critical patent/EP0602680A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate

Definitions

  • the invention relates to a potassium silicate-containing sealant having excellent resistance to molten metal, specially molten zinc and its manufacturing method, said sealant preferably applied to a component which contacts or is immersed in molten zinc in a hot-dip zinc plating line.
  • Molten zinc attacks metals such as a steel and the like and easily penetrates into small holes or gaps in the micron meter range because of its low surface tension and viscosity.
  • Some protecting methods are proposed or are in use for improving the resistance to molten zinc, as for example, specially developed steels as disclosed in Laid Open Japanese Patent Application No. S56-112117 and applying a thermally sprayed WC-Co coating as disclosed in Japan Patent Application Laid Open No. 111-225761.
  • these approaches are not sufficiently resistant to molten zinc attack.
  • Molten zinc resistant steels are basically iron base alloys and do not have enough resistance to molten zinc attack. The cost of those alloys are much higher than normal structural steels. Coatings such as self fluxing alloys and WC-Co are used as thermally sprayed coatings to protect substrates from the attack by molten zinc but sufficient resistance has not been achieved due to the permeation of molten zinc through interconnected porosity and selective attack on the metal binders.
  • the invention relates to a sealing material having an improved resistance to molten zinc attack and anti-wettability thus making it ideally suitable for structural materials or thermally sprayed coatings that are intended to be used in molten metals.
  • anhydrous potassium silicate is a sealant which has higher durability than existing water glass and colloidal anhydrous silicate.
  • a suitable sealant for this invention which showed excellent durability in molten zinc bath is formed by a process comprising the following steps:
  • the present invention is to provide firstly a sealant having an excellent resistance to molten metal, specially to molten zinc, comprising anhydrous potassium silicate as a main element which favorably consist of 30 to 70 wt% silic acid anhydride and 70 to 30 wt% anhydrous potassium oxide, secondly an article resistant to molten metal, specially to molten zinc, made of metal substrate and a dense layer on its surface comprising anhydrous potassium silicate as a main element and thirdly a process for forming a sealant resistant to molten metal, specially to molten zinc, comprising the steps of:
  • Anhydrous potassium silicate has better durability structurally against molten zinc than silica and anhydrous sodium silicate specially when it is used at over 400°C. It also has a good matching coefficient of thermal expansion with metal made substrates to be sealed as well as low wettability with molten zinc and molten aluminum.
  • the reasons for limiting the baking temperature in the range of 150 to 600°C is that water in the solution can not be vaporized well below 150°C which can result in cracks in the sealant layer when it is rapidly heated up to the molten zinc temperature (approx. 470 o C) during the operation while the substrate or thermally sprayed coating will generally start to be oxidized over 600°C.
  • the sole drawing shows a cross sectional view of a furnace used for zinc immersion testing of coated samples.
  • bar type test specimens coated with the solution of the sealant of this invention are baked at 450°C before being tested.
  • a sealant prepared by the water solution of potassium silicate is applied on a bar type specimen 1 and baked at 450°C to obtain the sealant layer 2.
  • the specimen is immersed into molten zinc 3 in a graphite pot 4 placed in a furnace 6 kept at 450°C by a heater 5.
  • Table 1 shows results of the immersion test in which no degradation was observed after 1000 hours duration and cracks take place after 1100 hours with some small partial spalling but the spalling does not appear to extend after 1400 hours.
  • Evaluation is made by ratings A to E based on the microscopic observation of degree of zinc adhesion and degradation of the scaled layer after the immersion test.
  • a sealant prepared by the water solution of silic acid anhydride is applied on a bar type specimen and the immersion test is conducted in accordance with the same procedure as recited above. As shown in Table 1, cracks are observed after 300 hours, small defects extend after 500 hours and after 700 hour testing substrate is exposed and zinc strongly adheres.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Coating With Molten Metal (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating By Spraying Or Casting (AREA)
EP93120451A 1992-12-18 1993-12-17 Verschlussdichtung enthaltend Kaliumsilicate Withdrawn EP0602680A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4355497A JPH06228722A (ja) 1992-12-18 1992-12-18 耐溶融金属侵食性シール材およびその製造方法
JP355497/92 1992-12-18

Publications (1)

Publication Number Publication Date
EP0602680A1 true EP0602680A1 (de) 1994-06-22

Family

ID=18444294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120451A Withdrawn EP0602680A1 (de) 1992-12-18 1993-12-17 Verschlussdichtung enthaltend Kaliumsilicate

Country Status (2)

Country Link
EP (1) EP0602680A1 (de)
JP (1) JPH06228722A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101765255B (zh) * 2010-02-02 2011-08-31 西安交通大学 浸入式热浸镀复合陶瓷保护管及制备方法
CN102506429A (zh) * 2011-11-07 2012-06-20 西安交通大学 浸入式燃气陶瓷内加热器套管及其制备方法
CN105509488A (zh) * 2015-12-23 2016-04-20 西安超码科技有限公司 一种浸入式陶瓷电阻内加热装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029629A1 (de) * 1979-11-21 1981-06-03 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Schützen von Vorrichtungen, die beim Feuerverzinken metallener Gegenstände verwendet werden
JPS6157654A (ja) * 1984-08-29 1986-03-24 Okuno Seiyaku Kogyo Kk 透明無機質被覆剤組成物及び透明無機質皮膜形成方法
JPH04193969A (ja) * 1990-11-27 1992-07-14 Kobe Steel Ltd 合金化溶融亜鉛めっき鋼板

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029629A1 (de) * 1979-11-21 1981-06-03 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Schützen von Vorrichtungen, die beim Feuerverzinken metallener Gegenstände verwendet werden
JPS6157654A (ja) * 1984-08-29 1986-03-24 Okuno Seiyaku Kogyo Kk 透明無機質被覆剤組成物及び透明無機質皮膜形成方法
JPH04193969A (ja) * 1990-11-27 1992-07-14 Kobe Steel Ltd 合金化溶融亜鉛めっき鋼板

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 71-44726S, C26: "sealing anodised alumimium surfaces" *
DATABASE WPI Derwent World Patents Index; AN 86-116718 C18, "transparent inorganic metal-coating comp." *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 518 (C - 0999) 26 October 1992 (1992-10-26) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101765255B (zh) * 2010-02-02 2011-08-31 西安交通大学 浸入式热浸镀复合陶瓷保护管及制备方法
CN102506429A (zh) * 2011-11-07 2012-06-20 西安交通大学 浸入式燃气陶瓷内加热器套管及其制备方法
CN102506429B (zh) * 2011-11-07 2013-12-04 西安交通大学 浸入式燃气陶瓷内加热器套管及其制备方法
CN105509488A (zh) * 2015-12-23 2016-04-20 西安超码科技有限公司 一种浸入式陶瓷电阻内加热装置

Also Published As

Publication number Publication date
JPH06228722A (ja) 1994-08-16

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