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
  • C23C22/08—Orthophosphates

Definitions

• This invention relates to a rust-proofing material and more particularly to such a material which may be kept in granular or powdered form under usual weather conditions without deterioration. More specifically,
• the invention relates to a rust-proofing material comprising granular or powdered high acid phosphates with a material added thereto for deterring the drying out of the phosphates.
• This invention is applicable to rust-proofing material such as that disclosed in the patent to Green et al on. rust-proofing, No. 1,651,694, dated December 6, 1927, and which includes phosphates of the metals of the electromotive series from manganese to iron, inclusive, and corresponding substantially to the formula M (H PO 2.
• Rust-proofing material such as that dis- :0 closed and claimed in the above cited patent contains a certain amount of water when first formed. Some of this is water of crystallization and some of it is doubtless present in other forms.
• t ere When the freshly formed ma- :5 terial is ex osed to the air at ordinary temperatures t ere is generally a slight initial loss of weight by drying and a subsequent absorption of moisture from the atmosphere to equal or exceed the original weight of the 80 material.
• the freshly ormed material is more readily soluble in a rust-proofing bath than is the material after it has dried to this slight extent and then reabsorbed moisture.
• this lumpin of the material can be effectively revented y preventing the initial dryingo the material.
• the moisture seems to remain present in its original relation to the crystals and the crystals retain their original characteristics.
• the material which has been so treated as to retain its original moisture retains also its accompanying original characteristics and not only handles morereadily, because it does not undergo lumping, but also is somewhat more readily soluble and, therefore, more eflicient as a rust-proofing material.
• This initial dryingof the material may be prevented by hermetically sealing the material immediately after its formation so as to mechanically prevent the escape of moisture from the container.
• the drying out may be prevented also by mixing therewith various materials which have the property of retaining moisture. There are many such materials well known, and which, therefore,
• boracic acid is preferred because it not only is not-detrimental to the efliciency of the bath, at least in the small amounts necessary to accomplish the purpose of this invention, but also during the boiling of the solution it volatilizes sufficiently to prevent detrimental building up in a the bath.
• an amount of boracic acid as 1% by weight of the phosphate powder effectively prevents the detrimental drying out of the powder. A less amount has some beneficial-effects and a greater amount can be used without any noticeable detrimental effect upon the bath.
• boracic acid is the best material thus far discovered, there are other materials, notably sugar and zinc carbonate, which can be used with considerable benefit, and even other materials, less satisfactory from the standpoint of subsequent use in the bath, can be effectively utilized for the purpose of preventing the drying out and caking of the powder.
• various materials in various amounts may be added to the phosseries from manganese to iron, inclusive, in
• granular or pulverulent form which comprises preventing the drying out of such materials from the time of their formation until they are to'be used by dissolvingin a rustproofing bath, and thereby preventing the change in the relation of the water associated with the material and consequent lumping or caking of the material which might otherwise .occur.
• a rust-proofing material comprising high acid phosphates of metals suitable for forming a rust-proofing bath for iron or steel, and containing a material which deters the drying out of the phosphate and thereby prevents lumping and caking.
• a rust-proofing material comprising crystalline high acid phosphates of metals of the electromotive series from manganese to iron, inclusive, and a material added to the crystals immediately after their separation and adapted to deter the drying out of said crystals.
• a rust-proofing material comprising high acid phosphates of metals of'the electromotive series from manganese to iron, inclusive, in granular or pulverulent form and containing boracic acid.
• a rust-proofing material comprising high acid phosphates of metals of the electromotive series from manganese to iron, in-
• a rust-proofing material comprising manganese dihydrogen phosphatein gram lar or pulverulent form, and from 1% to 3% of boracic acid.
• the method which consists in forming crystals of high acid phosphate of manganese, separating the cr stals from their mother liquor, and therea er and before the crystals dry out mixing therewith boracic acid.

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)
• Preventing Corrosion Or Incrustation Of Metals (AREA)

Priority Applications (3)

Applications Claiming Priority (3)

Publications (1)

Family

ID=61026429

Family Applications (1)

Country Status (3)

Cited By (1)

• 1928
  • 1928-11-15 US US319733A patent/US1866879A/en not_active Expired - Lifetime
• 1929
  • 1929-10-18 FR FR683487D patent/FR683487A/fr not_active Expired
  • 1929-10-26 DE DEM112370D patent/DE583024C/de not_active Expired

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