US1757959A - Foam-producing process and material for acid metal-cleaning baths - Google Patents
Foam-producing process and material for acid metal-cleaning baths Download PDFInfo
- Publication number
- US1757959A US1757959A US179389A US17938927A US1757959A US 1757959 A US1757959 A US 1757959A US 179389 A US179389 A US 179389A US 17938927 A US17938927 A US 17938927A US 1757959 A US1757959 A US 1757959A
- Authority
- US
- United States
- Prior art keywords
- foam
- bath
- acid
- acid metal
- producing process
- 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 - Lifetime
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
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S516/00—Colloid systems and wetting agents; subcombinations thereof; processes of
- Y10S516/01—Wetting, emulsifying, dispersing, or stabilizing agents
Definitions
- This invention relates broadly to the art of foam production and specifically to the foam produced on acid baths that emit hydrogen.
- the objects of the invention are to produce a more permanent foam on acid baths that emit hydrogen; to reduce the cost of foam production; to reduce the heat emanating from the bath; to save acid; to increase the efiiciency of the foam and to prevent the escape of acid spray from the bath.
- a foaming agent such as saponin, saponin-like materials, rye meal liquor and the like, cellulose pulp waste, etc., which acts to make the bubbles stable, and consequently causes thebath to cover itself with a blanket of foam,
- thioamides work well with all the foaming agents but from a commercial aspect, I prefer that foaming agent known as cellulose pulp waste liquor.
- I may make up an acid bath in a vat using v Gallons Water 1000 Sulphuric acid (66 B.) L 50 Into this bath there may be placed a ton of steel sheets to-be cleaned. The bath may be maintained at a temperature of 180 F.-
- I may a Cellulose pulp waste liquor .50 gallons Thiocarbanilide 2.00 pounds the materials referred to above, produces a 7 suitable blanket of foam that endures until the acid isexhausted.
- My invention therefore acts to conserve the foaming agent and to materially reduce the attention the bath requires to maintain the blanket of foam.
- the foaming agent and the foam protecting material may be compounded in advance and this admixture added to the bath instead of the simple foaming agent.
- R and R represent hydrocarbon radicals or hydrogen, and R represents hydrogen
- a bath for pickling metal comprising a metal etching acid and water, and further comprising a reaction controlling agent capable of generating formaldehyde in insuflicient'quantity to stop the generation of hydrogen, and cellulose Waste liquor.
- a bath for pickling metal comprising a metal etching acid and water, and further comprising a thioamide body in insuflicient quantity to stop the generation of hydrogen, and a foam producing agent.
- a bath for pickling metal comprising a metal etching acid and Water, and further comprising thiocarbanilide in insuflicient quantity to stop the generation of hydrogen,
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
Patented May 13, 1930 UNITED STATES PATENT OFFICE JAMES H. GBA VELL, OF ELKINS PARK, PENNSYLVANIA, ASSIGNOR TO AMERICAN CHEMICAL PAINT COMPANY, OF AMIBLER, PENNSYLVANIA, A CORPORATION OF DELAWARE FOAM-PRODUCING PROCESS AND MATERIAL FOR ACID METAL-CLEANING- BATH S No Drawing. Application filed new. 29, 1927,
This invention relates broadly to the art of foam production and specifically to the foam produced on acid baths that emit hydrogen.
The objects of the invention are to produce a more permanent foam on acid baths that emit hydrogen; to reduce the cost of foam production; to reduce the heat emanating from the bath; to save acid; to increase the efiiciency of the foam and to prevent the escape of acid spray from the bath.
Wheniron and steel are subjected to the action of an acid bath, such as a dilute solution of sulphuric acid, the acid attacks the metal and liberates hydrogen which bubbles up through the solution and escapes to the air. In so doing, the escaping hydrogen forms unstable bubbles on the surface of the bath, which in breaking, throw an acid mist or spray into the air, to the great detriment of health and materials in the vicinity.
In order to overcome this obnoxious condition, it is the custom to addto the bath a foaming agent, such as saponin, saponin-like materials, rye meal liquor and the like, cellulose pulp waste, etc., which acts to make the bubbles stable, and consequently causes thebath to cover itself with a blanket of foam,
which holds the escaping hydrogen long enough to allow its moisture to be precip1- tated back into the bath eliminating the acid maintain a permanent foam, the operator" must continually watch the bath and add the agent as conditions require. It should be noted that in the aggregate, so much of the foaming agent is required, that to add the entire amount when the bath is started, would so alter the proportions of the bath that in many cases it would not serve the purpose for 1 which it was intended. The care and atten tion required to maintain the proper foam on the bath depends so much on human nature that it is often neglected and hence the ob- Serial No. 179,389. Renewed. March 20,1930.
up, without danger of harming the bath, and
yet produce a satisfactory foam during the life of thebath.
The best foam protecting material known to me at the present time is formaldehyde,
paraformaldehyde, and those materials capa-- ble of generating formaldehyde in an acid bath in the presence of metal, such as thioamides and substituted thioamides (all these classes being hereafter included in the term thioamides). The thioamides work well with all the foaming agents but from a commercial aspect, I prefer that foaming agent known as cellulose pulp waste liquor.
To practice my invention I may make up an acid bath in a vat using v Gallons Water 1000 Sulphuric acid (66 B.) L 50 Into this bath there may be placed a ton of steel sheets to-be cleaned. The bath may be maintained at a temperature of 180 F.-
dgo this bath containing the steel, I may a Cellulose pulp waste liquor .50 gallons Thiocarbanilide 2.00 pounds the materials referred to above, produces a 7 suitable blanket of foam that endures until the acid isexhausted.
All other conditions being equal, a bath operated without my foam protector would require constant additions of the foaming agent so that in the aggregate itwould amount to ten times as much or more.
My invention therefore acts to conserve the foaming agent and to materially reduce the attention the bath requires to maintain the blanket of foam.
For convenience the foaming agent and the foam protecting material may be compounded in advance and this admixture added to the bath instead of the simple foaming agent. In this case I prefer to use the evaporated cellulose pulp waste liquor which isa solid and I may compound the ingredients as follows Pounds Evaporated cellulose pulp Waste liquor- 2.00
Thiocarbanilide; 2 00 This results in a powder admixture, insufficient amount to treat the bath which I have described above.
Although I am unable to propose a philosophy to account for the surprising result of materially increasing the longevity of the foam, I am convinced that the presence of the formaldehyde accounts in some unknown manner for it.
The following is a definition of thiomide:
where R and R represent hydrocarbon radicals or hydrogen, and R represents hydrogen,
a hydrocarbon radical, an amino group or a substitute amino group.
It will be obvious to those skilled in the art that the invention is of chemical character, hence I claim the benefit of equivalents appropriate in such cases.
I claim:
1. A bath for pickling metal comprising a metal etching acid and water, and further comprising a reaction controlling agent capable of generating formaldehyde in insuflicient'quantity to stop the generation of hydrogen, and cellulose Waste liquor.
- and a foam producin a ent.
JAiiE 2. A bath for pickling metal comprising a metal etching acid and water, and further comprising a thioamide body in insuflicient quantity to stop the generation of hydrogen, and a foam producing agent.
3. A bath for pickling metal comprising a metal etching acid and Water, and further comprising thiocarbanilide in insuflicient quantity to stop the generation of hydrogen,
I-I. GRAVELL.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US179389A US1757959A (en) | 1927-03-29 | 1927-03-29 | Foam-producing process and material for acid metal-cleaning baths |
FR651780D FR651780A (en) | 1927-03-29 | 1928-03-26 | Improved process and material for producing dross for metal cleaning |
GB9420/28A GB287911A (en) | 1927-03-29 | 1928-03-28 | Improvements in or relating to the pickling of iron and steel |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US651780XA | 1927-03-29 | 1927-03-29 | |
US287911XA | 1927-03-29 | 1927-03-29 | |
US179389A US1757959A (en) | 1927-03-29 | 1927-03-29 | Foam-producing process and material for acid metal-cleaning baths |
Publications (1)
Publication Number | Publication Date |
---|---|
US1757959A true US1757959A (en) | 1930-05-13 |
Family
ID=61187865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US179389A Expired - Lifetime US1757959A (en) | 1927-03-29 | 1927-03-29 | Foam-producing process and material for acid metal-cleaning baths |
Country Status (3)
Country | Link |
---|---|
US (1) | US1757959A (en) |
FR (1) | FR651780A (en) |
GB (1) | GB287911A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2982702A (en) * | 1950-05-09 | 1961-05-02 | Ralph F Wehrmann | Pretreating uranium for metal plating |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1156291B (en) * | 1958-10-04 | 1963-10-24 | Hoechst Ag | Inhibitor for sulfamic acid when used as a cleaning agent, metal stain, etc. like |
-
1927
- 1927-03-29 US US179389A patent/US1757959A/en not_active Expired - Lifetime
-
1928
- 1928-03-26 FR FR651780D patent/FR651780A/en not_active Expired
- 1928-03-28 GB GB9420/28A patent/GB287911A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2982702A (en) * | 1950-05-09 | 1961-05-02 | Ralph F Wehrmann | Pretreating uranium for metal plating |
Also Published As
Publication number | Publication date |
---|---|
GB287911A (en) | 1929-06-28 |
FR651780A (en) | 1929-02-27 |
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