Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/0073—Anticorrosion compositions
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/04—Water-soluble compounds
  • C11D7/06—Hydroxides
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/04—Water-soluble compounds
  • C11D7/10—Salts
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/04—Water-soluble compounds
  • C11D7/10—Salts
  • C11D7/12—Carbonates bicarbonates
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/04—Water-soluble compounds
  • C11D7/10—Salts
  • C11D7/14—Silicates
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
  • C11D7/02—Inorganic compounds
  • C11D7/04—Water-soluble compounds
  • C11D7/10—Salts
  • C11D7/16—Phosphates including polyphosphates
• • 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
  • C23F11/06—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly alkaline 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
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
  • C23G1/16—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions using inhibitors

Definitions

• This invention relates generally to alkaline preparations, for example alkaline detergents for cleaning soft metals and more particularly to such detergents containing an inhibiting agent for preventing the alkaline corrosion of the metal.
• the present invention has many advantages over the methods previously employed. Aluminum, tin, zinc, lead,
• cadmium or other soft metals or alloys thereof l may be treated with solutions of extremely high pH at boiling temperatures for long periods of time without showing any evidence of corrosion.
• the cleaning solutions preferably have a pH of at least 10 and in many cases the pH is as high as 12 or over.
• the corrosion inhibitors which I employ do not decrease in effectiveness with time, as do the sulphites, but remain effective over long periods. They are without harmful eflect upon the human skin and will not occasion the diiiiculties accompanying the use of chromates or dichromates.
• Sodium metasilicate, sesquisilicate and orthosilicate are strong alkalies, their alkalinity in creasing in the order listed. It is well known that even the weakest of these, namely sodium metasilicate when used for example to wash tin or tin plate causes rapid spangling and solution of the I have found that by adding a small quantity of a mercury salt to any of these silicates the corrosive effect of the solution subsequently made from it is reduced to zero evenat boiling temperatures over long periods of time.
• Tables I, II and III indicate the results that have been obtained when several pieces of tin plate were heated in alkaline solutions at 60 C. for the periods of time specified.
• the results show the per cent lossfin weight of the tin in the cases where the alkali did not contain any mercury salt and in the cases where it did contain a mercury salt as an inhibite Mercuric-chloride was used in these ing agent. tests as a typical mercury salt.
• the alkaline solution was a 0.5% aqueous solution of sodium metasilicate aloneand also with 5% of mercuric chloride based on phate and sodium metasilicate.
• Table I Per cent loss in weight 0.5% aqueous solution of sodium metasilicate+5% mercuric chloride (based on weight of sodium metasilicate) 0.5% aqueous solution of sodium metasilicate Hours
• Table II Per cent loss in weight loss in weight loss in weight of .803% after heating for 222 hours.
• the mercury salts exhibit similar inhibiting effect, when they are used with trisodium ortho- 5 phosphate alone as shown in Table II or with mixtures of sodium meta'silicate and trisodium orthophosphate as shown in Table 111.
• the mercury salt should be used in. an amount equal to at least 1%,,based ⁇ on the weight of the alkali present and generallyin an amount-of at least 2% by, weight. 'When the cleaning solution is used at low temperatures, it is possible to decrease the amount of mercury salt evenbelowthe lowestfigurepreviously given. Generally it is unnecessary to use more than of the mercury salt, although more might be used without harmful effect.
• the detergent solution containing the corrosion inhibitor is useful in'all cases where ahighly alkaline detergent is required. Itmay be used for example in the ,,washing,of. tin plate, tubes,
• This may be removed by the use of a highly alkaline cleaning solution in accordance with the present invention without attack on the tin.
• the cleaningsolutions maybe used also in the treatment of aluminum, In this case also, the solution may be used to remove the grease employed in fabricating the aluminum without, however, causing alkaline corrosion of the aluminum.
• aqueous solution of tri- For washing pans in a bakery where the pans Hours ii i t ri l d i i ggfggg gg gg gggggggf gggg are washed fairly frequently, so that theamount Phmhm oltrisodium phosphate) of burned on matter is not excessive, I may use p a cleaning composition containing about 95% 9. .194 0.0124 sodium metasilicate and 5% of mercuric chloride ggggjg: 335; or other soluble mercury salt.
• aqueous solution of a mi Where thedeposits on the bakery pans are exol z sgu f of 40% Osmium cess1ve I might use an aqueous solution of a mmmsodium ph p a and spdium composition containing 95% sodiumorthosilicate Hours orthonhosphate metas1licate+5% mercuncchloride (based on weight of trisodium orthophosphate and sodium metasilicate) and 60% sodium metasilicatc hours tin the sodium metasilicate solution.
• a mmmsodium ph p a and spdium composition containing 95% sodiumorthosilicate Hours orthonhosphate metas1licate+5% mercuncchloride (based on weight of trisodium orthophosphate and sodium metasilicate) and 60% sodium metasilicatc hours tin the sodium metasilicate solution.
• I might use a 1% aqueous solution of a composition containing 60% sodium metasilicate, 35% sodium hydroxide and 5% mer curic chloride or other soluble mercury salt where a highly alkaline solution is desired.
• a wetting agent such as a sodium salt of a sulphated' fatty alcohol in the amount of 13% based on the total weight of the solids.
• the soluble mercury salts also act as inhibitors of corrosion in the presence of mixtures of alkalies with soap, casein, defiocculating agents, wetting agents, abrasives and the like.
• the soluble mercury salts effectively inhibit the corrosion of tin, aluminum and other soft metals by alkali-metal carbonate solutions as well as solutions of the alkali-metal phosphates and silicates.
• I may add sodium hydroxide or other alkali to the silicates, phosphates or carbonates in any case where it is desired to increase the alkalinity and the corrosion of the metal may be inhibited by the use of soluble mercury salts.
• the invention enables the use of highly alkaline solutions in the cleaning of soft metals without corrosion of the metal.
• the invention has been described particularly in connection with preventing the corrosion of aluminum and tin, it is applicable also to the treatment of zinc, lead,
• soft metal as used here is intended to include any metal or alloy which under the proper conditions of temperature and concentration tends to beattacked or dissolved by alkaline solutions.
• the invention is applicable to inhibiting corrosion of alkaline compositions in general, such for example as paints or adhesives.
• alkaline compositions such for example as paints or adhesives.
• a soluble mercury salt to an alkaline paint or adhesive will prevent the attack of the paint or adhesive on soft metals, during the time required for the paint or adhesive to set or harden.
• An alkaline detergent composition for soft metal comprising an alkali-metal salt of the group consisting of silicate, phosphate and carbonate, said detergent composition having a pH of at least 10 in aqueous solution and which under normal conditions of use will corrode the soft metal, said detergent composition comprising at least about 1% of a mercury salt based on the weight of said alkali-metal salt to inhibit corrosion of the soft metal, said mercury salt being soluble in the aqueous solution of said alkali-metal salt.
• An alkaline detergent composition for soft metal comprising an alkali-metal silicate, said detergent composition having a pH of at least 10 in aqueous solution and which under normal conditions of use will corrode the soft metal, said detergent composition comprising at least about 1% of a mercury salt based on the weight of said alkali-metal silicate to inhibit corrosion of the soft metal, said mercury salt being soluble in the aqueous solution of said alkali-metal silicate.
• An alkaline detergent composition for soft metal comprising by weight about 60 to 95% sodium metasilicate, an effective amount up to about 35% sodium hydroxide and about 1 to 10% of a mercury salt, said mercury salt being soluble in the aqueous solution of said sodium metasilicate.
• An alkaline detergent composition for soft metal comprising by weight about 95% sodium metasilicate and about 5% of a mercury salt, said mercury salt being soluble in the aqueous solution of said sodium metasilicate.
• An alkaline detergent composition for soft metal said detergent composition comprising by weight about 95% sodium metasilicate and about 5% mercuric chloride.
• An alkaline detergent composition for soft metal comprising by weight about 95% sodium orthosilicate and about 5% of a mercury salt, said mercury salt being soluble in the aqueous solution of said sodium orthosilicate.
• An alkaline detergent for soft metal said detergent composition comprising by weight about 95% sodium orthosilicate and about 5% CERTIFICATE CHARLES It is hereby certified that error of the above 0nd column, an that the in that the fice.
• An alkaline detergent composition for soft metal comprising by weight about sodium metasilicate, about 35% sodium hydroxide and about 5% mercuric chloride.
• An alkaline detergent composition for soft metal comprising by weight about 60 to sodium metasilicate, an effective amount up to about 35% sodium hydroxide and about 1 to 10% mercuric chloride.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Wood Science & Technology (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Life Sciences & Earth Sciences (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• General Chemical & Material Sciences (AREA)
• Detergent Compositions (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Priority Applications (12)

Applications Claiming Priority (2)

Publications (1)

Family

ID=23034508

Family Applications (2)

Family Applications After (1)

Country Status (7)

Cited By (6)

Families Citing this family (4)

• 1939
  • 1939-05-01 US US271177A patent/US2303398A/en not_active Expired - Lifetime
  • 1939-05-01 US US271176A patent/US2303397A/en not_active Expired - Lifetime
• 1940
  • 1940-04-03 GB GB15124/41A patent/GB541863A/en not_active Expired
  • 1940-04-03 GB GB6016/40A patent/GB541861A/en not_active Expired
  • 1940-04-03 GB GB15123/41A patent/GB541862A/en not_active Expired
  • 1940-04-20 NL NL97704A patent/NL59474C/xx active
  • 1940-04-25 SE SE158640A patent/SE106984C1/xx unknown
  • 1940-04-25 FR FR865162D patent/FR865162A/fr not_active Expired
  • 1940-04-25 FR FR865163D patent/FR865163A/fr not_active Expired
  • 1940-04-25 SE SE158540A patent/SE106902C1/xx unknown
  • 1940-04-29 BE BE438827D patent/BE438827A/xx unknown
  • 1940-04-30 CH CH234362D patent/CH234362A/de unknown

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