KR970706422A - METHOD OF INCREASING CORROSION RESISTANCE OF METHALS AND ALLOYS BY TREATMENT WITH RATE EARTH ELEMENTS - Google Patents

METHOD OF INCREASING CORROSION RESISTANCE OF METHALS AND ALLOYS BY TREATMENT WITH RATE EARTH ELEMENTS Download PDF

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KR970706422A
KR970706422A KR1019970702263A KR19970702263A KR970706422A KR 970706422 A KR970706422 A KR 970706422A KR 1019970702263 A KR1019970702263 A KR 1019970702263A KR 19970702263 A KR19970702263 A KR 19970702263A KR 970706422 A KR970706422 A KR 970706422A
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rare earth
nitrate
salt
composition
earth element
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유쳉 루
마이클 브라이언 아이비스
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엠.아트. 맥더몰
맥마스터 유니버시티
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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
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • 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
    • 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
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    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/50—Treatment of iron or alloys based thereon
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/52—Treatment of copper or alloys based thereon
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/56—Treatment of aluminium or alloys based thereon
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated

Abstract

본 발명은 페라이트성 스테인레스 강, 오오스테나이트성 스테인레스 강, 구리 및 알루미늄 합금과 같은 금속의 표면을 처리하여 내식성을 증가시키는 방법을 제공한다. 이들 금속들은 희토류 원소의 염을 포함하는 고온의 수성 조성물에 침지된다. 이트륨, 가돌리늄, 세륨, 유로퓸, 테르븀, 사마륨, 네오디뮴, 프라세오디뮴, 란탄, 흘뮴, 이테르븀, 디스프로슘의 질산염 및 질산 에르븀을 사용하여 내식성은 향상된다. 희토류 원소의 염은 용액의 약 2중량%에서 포화도까지의 분량으로 존재한다. 희토류 원소의 증착을 향상시키도록 표면의 산화물을 제거하기 위해 pH를 0.5 내지 약 6.5로 조절하는 질산과 같은 pH조절물질을 조성물은 포함한다. 알루미늄 합금의 경우 pH는 4.5 내지 6.5로 유지되고, 니켈계 합금 및 오오스테나이트성 스테인레스 강의 경우는 pH는 0.5 내지 3.5로 유지되며, 페라이트성스테인레스 강의 경우는 pH는 2.0 내지 4.5로 유지된다. 금속 표면은 조성물에 침지시키기 전 또는 침지중에 연마될 수 있다. 온도 60 내지 95℃로 유지된 조성물에 15 내지 20분동안 침지함으로써 내식성은 향상된다. 단독으로 사용되는 경우 가돌리늄, 네오디뮴 및 프라세오디뮴 질산염이 다른 희토류 원소의 질산염에 비해서 가장 높은 내식성을 보였다. 조성물 내에 둘 이상의 희토류 원소의 질산염 조합이 사용되는 경우 충분한 시너지 효과가 관찰된다. 질산세륨, 질산 가돌리늄 및 질산란탄을 기초로 하는 조성물은 틈 부식을 줄이는데 매우 효과적이다.The present invention provides a method for increasing the corrosion resistance by treating surfaces of metals such as ferritic stainless steels, austenitic stainless steels, copper and aluminum alloys. These metals are immersed in a hot aqueous composition comprising a salt of a rare earth element. Corrosion resistance is improved by using yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, yttrium, ytterbium, dysprosium nitrate and erbium nitrate. The salt of the rare earth element is present in an amount ranging from about 2% by weight of the solution to saturation. The composition includes a pH controlling material such as nitric acid to adjust the pH to from 0.5 to about 6.5 to remove oxides of the surface to enhance the deposition of rare earth elements. In the case of aluminum alloys, the pH is maintained at 4.5 to 6.5, while for nickel-based alloys and austenitic stainless steels the pH is maintained at 0.5 to 3.5 and for ferritic steels the pH is maintained at 2.0 to 4.5. The metal surface may be polished before or during immersion in the composition. Corrosion resistance is improved by immersing the composition at a temperature of 60 to 95 캜 for 15 to 20 minutes. When used alone, gadolinium, neodymium and praseodymium nitrate showed the highest corrosion resistance compared to nitrate of other rare earth elements. Sufficient synergistic effects are observed when nitrate combinations of two or more rare earth elements are used in the composition. Compositions based on cerium nitrate, gadolinium nitrate and lanthanum nitrate are very effective in reducing crevice corrosion.

Description

희토류원소처리에 의해 금속 및 합금의 내식성을 증가시키는 방법(METHOD OF INCREASING CORROSION RESISTANCE OF METHALS AND ALLOYS BY TREATMENT WITH RARE EARTH ELEMENTS)METHOD OF INCREASING CORROSION RESISTANCE OF METHALS AND ALLOYS BY TREATMENT WITH RARE EARTH ELEMENTS

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제3도는 포기된 용액(pH 8.26)중에서의 처리된 UNS S31603과 비처리된 UNS S31603의 전위역학적 극성화 곡선을 도시하는 도면이다.FIG. 3 is a plot showing the dislocation dynamics curves of treated UNS S31603 and untreated UNS S31603 in a given solution (pH 8.26).

Claims (26)

금속 또는 합금의 표면을 유효온도에서 수성조성물에 노출시키는 단계를 포함하고, 상기 수성조성물은 하나이상의 희토류원소의 염과, pH를 약 0.5 내지 약 6.5로 조절하여 상기 표면을 상태조절하므로써 이 표면에 대한 희토류원소의 증착을 향상시키는데 효과적인 분량으로 존재하는 pH조절제를 포함하는, 내식성을 증가시키기 위한 금속 및 합금의 처리방법.Exposing the surface of the metal or alloy to an aqueous composition at an effective temperature, said aqueous composition comprising a salt of one or more rare earth elements and adjusting the pH to from about 0.5 to about 6.5 to condition the surface, A method of treating metals and alloys for increasing corrosion resistance, comprising a pH adjusting agent present in an amount effective to enhance the deposition of rare earth elements. 제1항에 있어서, 상기 하나 이상의 희토류원소의 염은 이트륨, 가돌리늄, 세륨, 유로퓸, 테르븀, 사마륨, 네오디뮴, 프라세오디뮴, 란탄, 흘뮴, 이테르븀, 디스프로슘 및 에르븀의 염으로 이루어지는 군에서 선택되고, 할라이드를 함유하는 희토류원소의 염은 실질적으로 함유하지 않으며, 하나 이상의 희토류원소의 염은 약 2% 내지포화도가지의 분량으로 존재하는 방법.The method of claim 1 wherein said at least one rare earth element salt is selected from the group consisting of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, Wherein the salt of the at least one rare earth element is present in an amount of from about 2% to a saturation index. 제2항에 있어서, 상기 수성조성물에 노출시키시전에 금속 또는 합금의 표면을 연마하는 단계를 추가로 포함하는 방법.3. The method of claim 2, further comprising polishing the surface of the metal or alloy prior to exposure to the aqueous composition. 제2항에 있어서, 상기 금속 또는 합금은 폐라이트성 스테인레스 강이고, pH는 약 2 내지 약 4.5로 조절되며, 수성조성물의 온도는 약 60℃ 내지 약 95℃인 방법.3. The method of claim 2, wherein the metal or alloy is a waste-write stainless steel, the pH is adjusted to from about 2 to about 4.5, and the temperature of the aqueous composition is from about 60 캜 to about 95 캜. 제2항에 있어서, 상기 금속 또는 합금은 오오스테나이트성 스테인레스 강 및 니켈계 합금으로 이루어진 군에서 선택되고, pH는 약 0.5 내지 3.5로 조절되며, 수성조성물의 온도는 약 60℃ 내지 약 95℃인 방법.3. The method of claim 2, wherein the metal or alloy is selected from the group consisting of austenitic stainless steel and a nickel-based alloy, the pH is adjusted to about 0.5 to 3.5 and the temperature of the aqueous composition is from about 60 & / RTI > 제2항에 있어서, 상기 금속 또는 합금은 알루미늄 또는 알루미늄 합금이며, pH는 약 4.5 내지 약 6.5로 조절되며, 수성조성물의 온도는 약 60℃ 내지 약 95℃인 방법.The method of claim 2, wherein the metal or alloy is aluminum or an aluminum alloy, the pH is adjusted to about 4.5 to about 6.5, and the temperature of the aqueous composition is about 60 ° C to about 95 ° C. 제2항에 있어서, 상기 금속 또는 합금은 구리 또는 구리 합금이며, pH는 약 0.5 내지 약 6.5로 조절되며, 수성조성물의 온도는 약 60℃ 내지 약 95℃인 방법.3. The method of claim 2, wherein the metal or alloy is copper or a copper alloy, the pH is from about 0.5 to about 6.5, and the temperature of the aqueous composition is from about 60 < 0 > C to about 95 < 0 > C. 제2항에 있어서, 상기 하나이상의 희토류원소의 염은 질산가돌리늄인 방법.3. The method of claim 2 wherein the salt of said at least one rare earth element is gadolinium nitrate. 제2항에 있어서, 상기 하나이상의 희토류원소의 염은 질산가돌리늄 및 질산세륨의 혼합물인 방법.3. The method of claim 2, wherein the salt of the one or more rare earth elements is a mixture of gadolinium nitrate and cerium nitrate. 제2항에 있어서, 상기 조성물은 계면활성제를 포함하는 방법.3. The method of claim 2, wherein the composition comprises a surfactant. 금속 또는 합금의 표면을 상태조절하여 표면에 존재하는 원소산화물을 제거하는 단계; 및 하나이상의 희토류원소중 일부가 상기 표면에 혼힙되기에 유효한 조건하에서 상기 표면을 상기 하나이상의 희토류원소에 노출시키는 단계를 포함하는 내식성을 증가시키기 위해 금속 또는 합금을 처리하는 방법.Removing the element oxide present on the surface by controlling the surface of the metal or alloy; And exposing the surface to the one or more rare earth elements under conditions effective to cause some of the one or more rare earth elements to fuse to the surface. 제11항에 있어서, 상기 표면의 상태조절단계가 표면을 기계적으로 연마하는 단계를 포함하는 단계.12. The method of claim 11, wherein the conditioning of the surface comprises mechanically polishing the surface. 제11항에 있어서, 상기 상태조절단계 및 표면노출단계는 상기 원소 또는 합금을, 약2중량% 내지 포화도까지분량의 하나이상의 희토류원소와, pH를 약 0.5 내지 약 6.5로 조절하여 상기 표면에 대한 희토류원소의 증착을 촉진시키는데 효과적인 분량의 pH조절제를 포함하는 수성조성물에 함침시키는 단계를 포함하는 방법.12. The method of claim 11, wherein the conditioning and exposing comprises contacting the element or alloy with at least one rare earth element in an amount from about 2% to about saturation, and adjusting the pH to about 0.5 to about 6.5, Impregnating the aqueous composition with an amount of a pH adjusting agent effective to promote deposition of the rare earth element. 제13항에 있어서, 상기 하나이상의 희토류원소의 염은 이트륨, 가돌리늄, 세륨, 유로품, 테르븀, 사마륨, 네오디뮴, 프라세오디뮴, 란탄, 흘뮴, 이테르븀, 디스프로슘 및 에르븀의 염으로 이루어지는 군에서 선택되고, 할라이드를 함유하는 희토류원소의 염은 실질적으로 함유하지 않는 방법.14. The method of claim 13, wherein the at least one rare earth element salt is selected from the group consisting of yttrium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, Is substantially free of salts of rare earth elements. 페라이트성 스테인레스 강, 오오스테나이트성 스테인레스 강, 크롬, 몰리브덴, 구리, 구리합금, 알루미늄 및 알루미늄 합금의 표면을 처리하여 이들의 내식성을 증가시키는 방법으로서, 이 방법은 상기 금속의 표면을 이트륨, 가돌리늄, 세륨, 유로퓸, 테르븀, 사마륨, 네오디뮴, 프라세오디뮴, 란탄, 흘뮴, 이테르븀, 디스포슘 및 에르븀의 염으로 이루어지는 군에서 선택된 하나 이상의 희토류원소의 수용액과 pH를 약 0.5 내지 약 6.5로 조절하기에 충분한 분량의 pH조절제를 포함하며 상기 희토류원소는 약 2중량%에서 포화도까지 분량으로 존재하는 고온의 조성물에 노출시키는 단계를 포함하는 방법.A method for increasing the corrosion resistance of ferritic stainless steels, austenitic stainless steels, chromium, molybdenum, copper, copper alloys, aluminum and aluminum alloys by treating the surfaces thereof, the method comprising contacting the surfaces of the metals with yttrium, gadolinium At least one rare earth element selected from the group consisting of cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, germ, ytterbium, dysprosium and erbium salts; Wherein the rare earth element comprises an amount of a pH adjusting agent and the rare earth element is exposed to a high temperature composition present in an amount ranging from about 2% to about saturation. 제15항에 있어서, 표면노출단계전에 표면을 연마하는 단계를 포함하는 방법.16. The method of claim 15 including polishing the surface prior to the surface exposure step. 제15항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄인 방법.16. The method of claim 15, wherein the salt of said at least one rare earth element is gadolinium nitrate. 제15항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄 및 질산세륨의 혼합물인 방법.16. The method of claim 15, wherein the salt of the one or more rare earth elements is a mixture of gadolinium nitrate and cerium nitrate. 제15항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄, 질산네오디뮴 및 질산프라세오디뮴의 혼합물인 방법.16. The method of claim 15, wherein the salt of the at least one rare earth element is a mixture of gadolinium nitrate, neodymium nitrate, and praseodymium nitrate. 제15항에 있어서, 상기 조성물이 계면활성제를 포함하는 방법.16. The method of claim 15, wherein the composition comprises a surfactant. 이트뮴, 가돌리늄, 세륨, 유로퓸, 테르븀, 사마륨, 네오디뮴, 프라세오디뮴, 란탄, 흘뮴, 이테르븀, 디스프로슘 및 에르븀의 염으로 이루어지는 군에서 선택된 하나 이상의 희토류원소의 염의 수용액과 pH를 약0.5 내지 약6.5로 조절하기에 충분한 분량의 pH조절제를 포함하며 상기 희토류원소의 염은 약 2중량%에서 포화도까지의 분량으로 존재하는, 원소 및 합금을 처리하여 내식성을 증가시키기 위한 조성물.An aqueous solution of a salt of one or more rare earth elements selected from the group consisting of cadmium, gadolinium, cerium, europium, terbium, samarium, neodymium, praseodymium, lanthanum, germ, ytterbium, dysprosium and erbium salts and a pH adjusted to about 0.5 to about 6.5 Wherein the salt of the rare earth element is present in an amount ranging from about 2% by weight to the degree of saturation, to increase corrosion resistance by treating the element and the alloy. 제21항에 있어서, 상기 하나이상의 희토류원소의 염은 할라이드를 함유하는 희토류원소의 염은 실질적으로 함유하지 않는 조성물.22. The composition of claim 21, wherein the salt of the one or more rare earth elements is substantially free of a salt of a rare earth element containing a halide. 제22항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄인 조성물.23. The composition of claim 22, wherein the salt of said at least one rare earth element is gadolinium nitrate. 제22항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄 및 질산세륨의 혼합물인 조성물.23. The composition of claim 22, wherein the salt of the one or more rare earth elements is a mixture of gadolinium nitrate and cerium nitrate. 제22항에 있어서, 상기 하나이상의 희토류원소의 염이 질산가돌리늄, 질산네오디뮴 및 질산프라세오디뮴의 혼합물인 조성물.23. The composition of claim 22, wherein the at least one rare earth element salt is a mixture of gadolinium nitrate, neodymium nitrate, and praseodymium nitrate. 제22항에 있어서, 상기 조성물이 계면활성제를 포함하는 조성물.23. The composition of claim 22, wherein the composition comprises a surfactant. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019970702263A 1994-10-07 1995-10-10 METHOD OF INCREASING CORROSION RESISTANCE OF METHALS AND ALLOYS BY TREATMENT WITH RATE EARTH ELEMENTS KR970706422A (en)

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