GB762602A - Inhibiting corrosion of chromium-plated metal articles - Google Patents

Inhibiting corrosion of chromium-plated metal articles

Info

Publication number
GB762602A
GB762602A GB8563/54A GB856354A GB762602A GB 762602 A GB762602 A GB 762602A GB 8563/54 A GB8563/54 A GB 8563/54A GB 856354 A GB856354 A GB 856354A GB 762602 A GB762602 A GB 762602A
Authority
GB
United Kingdom
Prior art keywords
chromium
copper
article
nickel
gms
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
GB8563/54A
Inventor
William Charles Geisker
Richard Kerfoot Britton
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.)
AUTOYRE Co
Original Assignee
AUTOYRE Co
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 AUTOYRE Co filed Critical AUTOYRE Co
Priority to GB8563/54A priority Critical patent/GB762602A/en
Publication of GB762602A publication Critical patent/GB762602A/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
    • 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
    • C23C22/24—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 hexavalent chromium 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
    • 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
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto

Abstract

A chromium plated metal article in which the chromium plating is cathodic in a sodium chloride solution to the foundation metal is rendered corrosion-resistant by immersion in an aqueous solution containing hexavalent chromium until a coating is formed which is anodic to the foundation metal. Preferably the article is removed from the treating bath prior to formation of a visible coating, the bath containing 0.1 to 150 gms./litre of hexavalent chromium and having a pH of 2.5 to 7 and treatment being effected at between 70 and 212 DEG F. for at least 30 minutes. The articles treated may be steel plated with chromium, or with copper or nickel followed by chromium, or successively with copper, nickel, and chromium. Suitable hexavalent chromium compounds are chromic acid and the dichromates of sodium, potassium, ammonium, copper, calcium, zinc, and nickel. Typically the treating bath contains 50 gms./litre sodium dichromate and has a pH of 4.5, the article p treated being immersed in it for 2 hours at 190 to 212 DEG F.
GB8563/54A 1954-03-24 1954-03-24 Inhibiting corrosion of chromium-plated metal articles Expired GB762602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8563/54A GB762602A (en) 1954-03-24 1954-03-24 Inhibiting corrosion of chromium-plated metal articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8563/54A GB762602A (en) 1954-03-24 1954-03-24 Inhibiting corrosion of chromium-plated metal articles

Publications (1)

Publication Number Publication Date
GB762602A true GB762602A (en) 1956-11-28

Family

ID=9854885

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8563/54A Expired GB762602A (en) 1954-03-24 1954-03-24 Inhibiting corrosion of chromium-plated metal articles

Country Status (1)

Country Link
GB (1) GB762602A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696724A (en) * 1981-06-26 1987-09-29 Nisshin Steel Co., Ltd. Surface treatment of high-nickel/iron alloy steel plate for LNG or LPG tanks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696724A (en) * 1981-06-26 1987-09-29 Nisshin Steel Co., Ltd. Surface treatment of high-nickel/iron alloy steel plate for LNG or LPG tanks

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