KR880007794A - 강철재를 위한 인산염의 화학적 변환처리방법 - Google Patents

강철재를 위한 인산염의 화학적 변환처리방법 Download PDF

Info

Publication number
KR880007794A
KR880007794A KR870014046A KR870014046A KR880007794A KR 880007794 A KR880007794 A KR 880007794A KR 870014046 A KR870014046 A KR 870014046A KR 870014046 A KR870014046 A KR 870014046A KR 880007794 A KR880007794 A KR 880007794A
Authority
KR
South Korea
Prior art keywords
chemical conversion
ions
phosphate
treatment
steel materials
Prior art date
Application number
KR870014046A
Other languages
English (en)
Other versions
KR900007534B1 (ko
Inventor
시게끼 마쓰다
가즈히꼬 모리
와다루 고또오
다까히로 오오누끼
Original Assignee
오까베 다까시
닛뽕 덴소오 가부시기가이샤
원본미기재
니혼 파아카라이진 가부시끼가이샤
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 오까베 다까시, 닛뽕 덴소오 가부시기가이샤, 원본미기재, 니혼 파아카라이진 가부시끼가이샤 filed Critical 오까베 다까시
Publication of KR880007794A publication Critical patent/KR880007794A/ko
Application granted granted Critical
Publication of KR900007534B1 publication Critical patent/KR900007534B1/ko

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
    • 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
    • C23C22/07—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 containing phosphates
    • 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
    • C23C22/07—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 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/16—Orthophosphates containing zinc cations containing also peroxy-compounds
    • 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
    • C23C22/07—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 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/10—Orthophosphates containing oxidants
    • 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
    • C23C22/07—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 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
    • 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
    • C23C22/07—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 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/14—Orthophosphates containing zinc cations containing also chlorate anions

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

내용 없음.

Description

강철재를 위한 인산염의 화학적 변환처리방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명의 방법에 따라 강철 시이트상에 인산염의 화학적 변환 피복층을 형성한 실시예의 X-선 회절선 측정패턴을 나타내는 도면.
제2도는 제1도에 도시된 인산염 변환피복층의 인형의 주사전자 현미경사진.
제3도는 종래 방법에 따라 강철시이트상에 인산염 화학적 변환피복층을 형성한 실시예의 X-선 회절선 측정패턴을 나타내는 도면.

Claims (13)

  1. 강철재를 위한 인산염의 화학적 변환처리방법에 있어서, 인산염과 적어도 한가지 이상의 다른 유형의 활성음이온으로 이루어진 혼합음이온, 화학적 변환피복층을 형성할 수 있는 적어도 한가지 이상 유형의 금속이온과 산화제를 함유한 인산염의 화학적 변환처리용액과 강철재를 접촉시켜 강철재의 표면상에 인산염의 화학적 변환피복층을 형성하는 단계로 이루어지고, 여기서 인산염이온무게(P) 대 전체혼합음이온의 무게(An)의 무게비(P/An)가 1/2이거나 이하이고, 인산염의 화학적 변환처리 용액의 온도가 용액의 외부가열없이 40℃이거나 이하의 레벨로 조절되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  2. 제1항에 있어서, 다른 유형의 활성음이온이 적어도 하나 이상의 비금성원자를 가지게 한 강철재를 위한 인산염의 화학적 변환처리방법.
  3. 제1항에 있어서, 다른 유형의 음이온이 옥사이드 이온과 할로겐이온으로 이루어진 그루우프로 부터 선택된 적어도 하나 이상의 부재로 형성되게 한 강철재를 위한 인산염의 화학적변환처리방법.
  4. 제3항에 있어서, 옥사이드이온이 질산이온으로 이루어진 그루우프와 질산이온 및 염화이온으로 이루어진 혼합물로부터 선택되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  5. 제1항에 있어서, 화학적 변환처리용액이 0.5 내지 4.5범위의 PH를 가지고 300mV 이상의 ORP(수소 표준전극전위)를 가지게한 강철재를 위한 인산염의 화학적 변환처리방법.
  6. 제1항에 있어서, 산화제가 과산화수소, 과산화수소 발생물질과 질산이온으로 이루어진 그루우프로 부터 선택된 적어도 하나 이상의 부재를 포함하게한 강철재를 위한 인산염의 화학적 변환처리방법.
  7. 제1항에 있어서, 화학적변환피복층-성형금속이온들이 아연이온, 망간이온, 칼슘이온, 마그네슘이온과 철이온들로 이루어진 그루우프로 부터 선택되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  8. 제1항에 있어서, 화학적변환피복층-성형이온이 처리용액내에 0.5g/l 이상의 양으로 되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  9. 제1항에 있어서, 인산염이온의 무게(P) 대 화학적변환피복층성형금속이온의 무게(M)의 무게비(P/M)가 0.3 내지 3의 범위에 있게한 강철재를 위한 인산염의 화학적 변환처리방법.
  10. 제1항에 있어서, 화학적변환처리가 배치형처리로 되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  11. 제1항에 있어서, 인산염이온(P) 대 전체혼합음이온의 무게(An)의 무게비(P/An)가 0.08 내지 0.4의 범위에 있게한 강철재를 위한 인산염의 화학적 변환처리방법.
  12. 제1항에 있어서, 화학적변환처리가 연속적인 침적처리로 되게한 강철재를 위한 인산염의 화학적 변환처리방법.
  13. 제12항에 있어서, 연속침적처리가 1.5 내지 3.0g/l의 화학적변환피복층-성형금속이온, 4.5 내지 9g/l의 인산염이온과, NO- 3이온이 비추어 10 내지 70g/l의 다른 유형의 활성음이온을 함유한 처리용액을 이용하므로 수행되게한 강철재를 위한 인산염의 화학적 변환처리방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019870014046A 1986-12-09 1987-12-09 강철재를 위한 인산염의 화학적 변환처리방법 KR900007534B1 (ko)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP29157486 1986-12-09
JP61-291574 1986-12-09
JP62300150A JPS63270478A (ja) 1986-12-09 1987-11-30 リン酸塩化成処理方法
JP62-300150 1987-11-30

Publications (2)

Publication Number Publication Date
KR880007794A true KR880007794A (ko) 1988-08-29
KR900007534B1 KR900007534B1 (ko) 1990-10-11

Family

ID=26558602

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019870014046A KR900007534B1 (ko) 1986-12-09 1987-12-09 강철재를 위한 인산염의 화학적 변환처리방법

Country Status (6)

Country Link
US (1) US4880476A (ko)
EP (1) EP0271069B1 (ko)
JP (1) JPS63270478A (ko)
KR (1) KR900007534B1 (ko)
CA (1) CA1332346C (ko)
DE (1) DE3750465T2 (ko)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2633534B1 (fr) * 1988-07-01 1992-03-13 Roulements Soc Nouvelle Procede de depot d'un revetement auto-lubrifiant a base de ptfe sur un element de roulement et roulements ainsi obtenus
US5117370A (en) * 1988-12-22 1992-05-26 Ford Motor Company Detection system for chemical analysis of zinc phosphate coating solutions
JPH0331484A (ja) * 1989-06-27 1991-02-12 Nippon Parkerizing Co Ltd 亜鉛または亜鉛系メッキ材料の黒色化処理法
DE3927614A1 (de) * 1989-08-22 1991-02-28 Metallgesellschaft Ag Verfahren zur erzeugung von phosphatueberzuegen auf metallen
JP2739864B2 (ja) * 1991-05-01 1998-04-15 株式会社デンソー リン酸塩化成処理方法
US5645706A (en) * 1992-04-30 1997-07-08 Nippondenso Co., Ltd. Phosphate chemical treatment method
DE60037645T2 (de) * 1999-09-17 2008-12-18 Jfe Steel Corp. Oberflächenbehandeltes stahlblech und verfahren zu dessen herstellung
US7883118B2 (en) * 2005-03-29 2011-02-08 Sumitomo Metal Industries, Ltd. Threaded joint for steel pipes
US9574093B2 (en) * 2007-09-28 2017-02-21 Ppg Industries Ohio, Inc. Methods for coating a metal substrate and related coated metal substrates
JP5462467B2 (ja) * 2008-10-31 2014-04-02 日本パーカライジング株式会社 金属材料用化成処理液および処理方法
KR102123618B1 (ko) * 2018-04-19 2020-06-17 서울대학교산학협력단 금속 인산염 박막의 제조방법 및 이를 이용한 전기화학 촉매 전극

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE727194C (de) * 1938-05-11 1942-10-28 Metallgesellschaft Ag Herstellung von Phosphatueberzuegen, insbesondere auf Eisen und Stahl
FR1009994A (fr) * 1948-07-20 1952-06-05 Parker Ste Continentale Procédé et solutions de traitement des surfaces métalliques
BE567592A (ko) * 1957-11-29
US3082128A (en) * 1960-02-15 1963-03-19 Lubrizol Corp Method for reducing combustion chamber deposits in internal combustion engines
US3116178A (en) * 1961-05-29 1963-12-31 Lubrizol Corp Phosphating solutions
FR1342472A (fr) * 1962-12-07 1963-11-08 Hoechst Ag Procédé et agent de phosphatation de surfaces métalliques
DE1277645B (de) * 1963-07-27 1968-09-12 Metallgesellschaft Ag Verfahren zur Regenerierung von nitrithaltigen Zinkphosphatloesungen fuer die Herstellung von Phosphatueberzuegen bei Temperaturen bis zu 40íµ
DE1911972A1 (de) * 1969-03-10 1970-10-01 Metallgesellschaft Ag Verfahren zur Tauchphosphatierung von Eisen und Stahl
DE2143957A1 (de) * 1971-09-02 1973-03-08 Metallgesellschaft Ag Verfahren zum aufbringen eines phosphatueberzuges auf eisen und stahl
US4110127A (en) * 1974-01-23 1978-08-29 International Lead Zinc Research Organization, Inc. Procedure for depositing a protective precoating on surfaces of zinc-coated ferrous metal parts against corrosion in presence of water
US4086103A (en) * 1975-08-13 1978-04-25 Kevin James Woods Accelerator for phosphating solutions
GB2080835B (en) * 1980-07-25 1984-08-30 Pyrene Chemical Services Ltd Prevention of sludge in phosphating baths
DE3108484A1 (de) * 1981-03-06 1982-09-23 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur herstellung von phosphatueberzuegen auf metalloberflaechen
JPS58199874A (ja) * 1982-05-18 1983-11-21 Nippon Denso Co Ltd 鉄鋼表面に隣酸塩化成被膜を形成する方法
DE3244715A1 (de) * 1982-12-03 1984-06-07 Gerhard Collardin GmbH, 5000 Köln Verfahren zur phosphatierung von metalloberflaechen sowie hierfuer geeignete badloesungen
DE3245411A1 (de) * 1982-12-08 1984-07-05 Gerhard Collardin GmbH, 5000 Köln Verfahren zur phosphatierung elektrolytisch verzinkter metallwaren
JPS60238486A (ja) * 1984-05-09 1985-11-27 Nippon Denso Co Ltd 鉄鋼表面にリン酸塩化成被膜を形成する方法

Also Published As

Publication number Publication date
DE3750465T2 (de) 1995-04-13
EP0271069B1 (en) 1994-08-31
US4880476A (en) 1989-11-14
JPH041073B2 (ko) 1992-01-09
JPS63270478A (ja) 1988-11-08
DE3750465D1 (de) 1994-10-06
CA1332346C (en) 1994-10-11
EP0271069A3 (en) 1989-04-19
EP0271069A2 (en) 1988-06-15
KR900007534B1 (ko) 1990-10-11

Similar Documents

Publication Publication Date Title
Bianchi et al. Catalytic decomposition of acid hydrogen peroxide solutions on platinum, iridium, palladium and gold surfaces
KR880007794A (ko) 강철재를 위한 인산염의 화학적 변환처리방법
Olesen et al. Manganese dioxide as a potential cathodic reactant in corrosion of stainless steels
US4159309A (en) Process for the catalytic reduction of reducible compounds in solution
Ives et al. Cathodic reactions involved in metallic corrosion in chlorinated saline environments
ES479032A1 (es) Electrodo para procesos electroliticos.
Traore et al. Electrochemical behaviour of tellurium and silver telluride at rotating glassy carbon electrode
Atkinson et al. Anodic dissolution of iron in acidic chloride solutions
Iwaki Surface layer characteristics of ion-implanted metals
KR850008504A (ko) 철강표면에 인산염의 화성피막을 형성하는 방법
Ammar et al. Potentiodynamic and cyclic voltametric studies on the Passivity of Tin in neutral phosphate buffer
Vallet et al. XPS characterization of anodic layers grown on Ir-and Rh-implanted titanium
AU549921B2 (en) Softening fabrics
Elayaperumal et al. Passivity of Zirconium In Sulfuric Acid Solutions–Effect of Cathodic Pretreatment
Rumyantsev et al. Influence of the Carbon Content in Steels on the Current Efficiency During Their Anodic Dissolution
Fukuda et al. The mechanism of the anodic formation of S2O2− 8 ions on a Ti-supported IrO2 electrode in mixed aqueous solutions of H2SO4,(NH4) 4SO4 and NH4F
Tashlykov et al. Effect of Atomic Mixing on the Electrochemical and Corrosion Properties of Ni--Ti Surfaces
Killa et al. Studies on Mixed Complexes of Cd (II) With Trimethylenediamine and Succinate Using Differential Pulse Polarography
Petrocelli The electrochemical behavior of aluminum: II. In solutions of iron sulfate
US1344372A (en) Treatment of steel, iron, and similar articles
Chryssoulakis et al. Electrochemical Study of Iron in Sea-Water
Mustafa et al. Adsorption of Ca2+ on amorphous iron hydroxide from aqueous electrolyte solution
Donchenko et al. The inhibition of corrosion of copper by dimethylolthiourea in dilute nitric acid
ES403379A1 (es) Un procedimiento de fabricacion de un electrodo.
Subrahmanyam et al. Influence of water quality on the corrosion and electrochemical behavior of mild steel in synthetic acid mine waters

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20030924

Year of fee payment: 14

LAPS Lapse due to unpaid annual fee