SE201815C1 - - Google Patents
Info
- Publication number
- SE201815C1 SE201815C1 SE201815DA SE201815C1 SE 201815 C1 SE201815 C1 SE 201815C1 SE 201815D A SE201815D A SE 201815DA SE 201815 C1 SE201815 C1 SE 201815C1
- Authority
- SE
- Sweden
- Prior art keywords
- phosphate
- condensed
- nitrite
- cold working
- phosphating
- Prior art date
Links
- 229910019142 PO4 Inorganic materials 0.000 claims description 39
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 38
- 239000010452 phosphate Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 15
- 238000005482 strain hardening Methods 0.000 claims description 10
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 8
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 8
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 239000007800 oxidant agent Substances 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- -1 alkali metal salt Chemical class 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 229940005740 hexametaphosphate Drugs 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- 235000021317 phosphate Nutrition 0.000 description 33
- 239000000203 mixture Substances 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910004742 Na2 O Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
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- 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
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- 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
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- 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
- C23C22/18—Orthophosphates containing manganese cations
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- 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
- C23C22/22—Orthophosphates containing alkaline earth metal cations
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- 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
- C23C22/23—Condensed phosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
KLASS INTERNATIONELLSVENSK C23 if48 d1:7/ PATENT- OCH REGISTRERINGSVERKET Ans. 3217/1959 inkom den 3/4 1959 utlagd den 10/5 196 METALLGESELLSCHAFT AG, FRANKFURT A.M., FORBUNDSREPUBLIKEN TYSKLAND Forfarande for att underlatta kallbearbetning TJppfinnare: H Keller och A Mayr Prioritet begard 'ran den 5 april 1958 (FOrbundsrepublikert Tysktand) Foreliggande uppfinning wiser ett forfarande for kallbearbetning med hj alp av zinkfosfat innehallande overdrag fOr arbetsstycken, som endast aro avsedda att genom kallbearbetningen underga en ringa till mattlig deformation och som efter kallbearbetningen ej skola uppvisa nagra ytterligare bearbetningen stOrande roster av fosfatskiktet pa ytan.
For underlattande av kallbearbetning har det visat sig myeket lampligt att anbringa fosfatskikt pa arbetsstyckets yta. Man har salunda pafort fosfatskikt saval for att underlatta dragning av -L.-radar, ror och profiler, som for att underlatta kallflytningspressning och dj updragning.
Fosfateringen av ett arbetsstyekes yta har hittills sett goda resultat vid stora deformationsgrader. Vid medelstora till sma kalldeformationer har man emellertid mott svErigheter som det efter kallbearbetningens slut pa arbetsstyckenas yta kvarstannande ieke onskvarda rester av fosfatskiktets, som inverkade storande pa den efterfoljande blankglodgningen eller elektroplateringen.
Hittills liar det ej varit mojligt att pafora ett fosfatskikt, som i tillracklig grad underlattar kallbearbetningen isynnerhet for medelstora och stora deformationsgrader och som trots detta aven yid mindre deformationsgrader forbrukas i sa stor utstrackning, att storningar av det beskrivna slaget joke upptrada.
Forfarandet enligt foreliggande uppfinning kannetecknas darav, att arbetsstyckena behandlas med fosfateringslosningar som innehalla oxidationsmedel och zinkfosfat samt minst ett kondenserat fosfat, i synnerhet pyro-, tripoly- eller hexametafosfat, i mangder av 0,01-0,8 g/ 1, raknat som alkalimetallsaltet av den ifragavarande kondenserade fosforsyran.
Forfarandet kannetecknas vidare darav, att man for komplettering av fosfateringslosningarna tillshtter 0,1-2,g kondenserat fosfat per m2 behandlad yta.
Enligt uppfinningen pafores fosfatskiktei med hj alp av en nitritaccelerator liksom aven minst ett kondenserat fosfat innehallande losning, som kompletteras med sa stor mingd nitrit, att vid kompletteringen forhallandet nitrit : kondenserat fosfat utgor 2: 1 till 1: 6 foretradesvis 1: 2 till 1: 4.
Forfarandet enligt uppfinningen kan exempelvis med fordel anvandas vid kallbearbetfling av rör, isynnerhet svetsade rOr och profilror. Svetsade ror eller profilror underga efter svetsningen endast en forhallandevis ringa tvarsnittsminskning, som framfiirallt tjanar till att homogenisera svetsen. Harvid komrner det an pa aft med ringa avdragsgrad uppna en skarp profilering av profilkanterna, utan att en storre tvarsnittsminskning an erforderlig. Deformationsgraderna motsvara emellertid sdllan mer an -% minslming av vaggtjockleken, och en sadan deformation kan genomforas i ett a tva stick.
Vid anyandning av de kanda fosfateringsforfarandena, t. ex. med hjalp av oxidationsmedel hmehallande zinkfosfatlosningar, kvarbli vasentliga mangder av fosfatskiktet efter deformationsforloppen pa ytan. Om emellertid ett fOr kallbearbetning avsett fOremal fos- Dupl. kl. 7 b: 4/50; 487/08 2201 8 faterats med fosfateringslosningar, som dessutom innehalla ett kondenserat fosfat i den angivna mangden, forekomma efter bearbetningen praktisld taget inga rester av fosfatskiktet pa ytan, atminstone icke stOrre mangder an att en stOrningsfri blankglodgning och aven en elektroplatering med framgang kan genomforas.
En sarskild fordel med pafOrandet av fosfatskikt med anvandning av de enligt uppfinningen fOreslagna fosfateringslosningarna ar, att man med hjalp av dessa 15sningar aven kan phfOra homogena fosfatskikt awn pa blankglodgat material, °eh att aven svetsar bli jamnt overdragna med fosfatskiktet.
I jamforelse med de kanda fosfateringsf5rfarandena är sldktbildningen med hjalp av fosfateringslosningar, som innehaila kondenserade fosfat, dessutom gynnsam, emedan kemikaliefOrbrukningen och slambildningen aro mindre. Ftir paforandet av fosfatskiktet forbrukas c:a 30-50 % mindre kemikalier i jamforelse med de fosfateringsforfaranden, som vanligtvis anvandas for underlattande av kallbearbetningen.
Forfarandet enligt uppfinningen kan framforallt tillampas vid kallbearbetning av svetsade profiler, t. ex. for framstallning av dorroch fonsterprofiler. For pafarande av fosfatskild pa sadana profiler aro de hittills anvanda fosfateringsforfarandena foga lampade, emedan de kvarlanma vasentliga hterstoder ph ytan, under det att det enligt uppfinningen f0- reslagna fosfateringsforfarandet med anvandning av fosfateringslosningar, som innehalla kondenserade fosfat, visat sig utomordentligt val lampat.
Exempel 1. Av bandstal pa en rorsvetsmaskin framstallda ror med 46 mm ytterdiameter och 2 mm godstjocklek underkastades en rekristalliserande glocigning under skyddsgas vid 720° C och aktiverades darefter en kort stund i c :a 15-procentig, varm svavelsyra. Efter grundlig kallvattenspolning i 5-10 minuter fosfaterades riiren. For fosfateringen anvandes en losning Hied foljande sammansattfling: 5,0 g/1 zink 3,9 g/1 P20 8,0 g/1 NO3 0,2 g/1 NaNO2 0,2 g/1 natriumhexametafosfat ROren hollos neddoppade 5-10 minuter i badet, som hölls vid en temperatur av 55° C. Efter fosfateringen spolades Toren i kallt vat-ten, infettades vid rumstemperatur i en vattenhaltig, tvalhaltig smorjrnedelslOsning och torkades. Vid den foljande dragningen pa ror dragbank reducerades roren i fOrsta sticket till 40 mm ytterdiameter och 1,8 mm vagg- tjocklek samt i andra sticket utan mellanbehandling till 36 mm ytterdiameter och 1,5 mm vaggtjocklek, dvs. motsvarande en total tvarsnittsminskning av 40 %.
I ett annat fall bearbetades pa samma satt fosfaterade ror med 32 mm ytterdiameter och 1,6 mm vaggtjocklek i det fOrsta sticket till 29 mm ytterdiameter och 1,3 mm vaggtjoeklek, och i det andra sticket utan mellanbehandling till 25 mm ytterdiameter och 1,0 mm vaggtjocklek, dvs. motsvarande en total tvarsnittsminskning av 51,4 %.
Jamfort harmed fosfaterades motsvarande repr pa vanligt satt i en fosfateringslosning med den ovannamnda sammansattningen men utan kondenserat fosfat samt kallbearbetades ph det beskrivna sattet. Medan vid den enligt uppfinningen fOreslagna behandlingen ett homogent oeh tatt fosfatskikt erholls saval ph rOrytan som ph svetsen, var fosfatskiktbildningen vid fosfateringen med ett bad, som ej inneholl kondenserat fosfat, ojaran Over hela ytan och framforallt ph svetsen. De med losningar utan kondenserade fosfat fosfaterade roren gingo fOljaktligen oroligt genom dragbanken och hade period-vis benagenhet att skramla, medan de enligt uppfinningen fosfaterade roren kunde dragas storningsfritt. Efter tva stick i dragmaskinen hade ytan av de ror, som fosfaterats i losningar utan kondenserade fosfat, morka flaekar och var pa storande satt Overtaekt med rester av fosfatskiktet, varfor man icke heller efter blankglodgningen av roren kunde erhalla en fullgod yta, pa vilken en elektroplatering hade varit mojlig. De enligt uppfinningen fosfaterade roren visade dare-mot efter tva stick en ljus, metalliknande yta, som icke heller vid efterfoljande glodgning vallade nagra som helst svarigheter for de fortsatta foradlingsoperationerna. Framf8rallt kunde en elektroplatering genomforas utan storning.
Den i exempel 1 angivna fosfateringslosningen kart hallas verksam genom komplettering med hjalp av en losning med foljande sammansattning: 202,0 g/1 zink 330,0 g/1 P20 199,0 g/1 NO3 Losningen kompletteras dessutom med nitrit och kondenserat fosfat, fOretradesvis i farhallandet 1: 1, varvid den tillsatta mangden beraknas med hansyn till nitrithaltens uppratthallande.
For fosfateringen kan man aven anvanda losningar med andra oxidationsmedel, och da. 291 83 framforallt zinkfosfatlosningar eller 18sningar, som atminstone innehalla zinkfosfat., Som ytterligare oxidationsmedel ha klorat i bland-fling med nitrat, nitrit enbart, visat sig gynnsamma. Lbsningarnas halter av kondenserade fosfat utgora awn i dessa fall 0,01-0,8 g/1. Liisningarna kunna forutom zinkfosfat aven innehalla andra tillsatser, t. ex. kalciumsalter, framf &alit kalciumfo slat, mangansalter, framforallt manganfosfat, jarnsalter, framforallt jarnfosfat.
Exempel 2. For ansattning och komplettering anvandes ett vattenhaltigt koncentrat med foljande sammansattning: 113,5 g/1 Zn 348,0 g/1 P20 126,5 g/1 C3 47,0 g/1 Na20 Ett med denna losning framstallt bad hade foljande sammansattning: 3,1 g/1 Zn 9,4 g/1 P20 3,4 g/1 C3 1,3 g/1 Na20 Till detta grundbad sattes 0,12 g/1 pentanatriumtripolyfosfat, i ett annat fall 0,1 g/1 natriumhexametafosfat, och i dessa bad, ilksom aven i ett bad utan tillsats, fosfaterades st.ilror 8 minuter vid 70° C medelst neddoppning. P samma satt som angetts I exempel 1 intAlades roren darefter och drogos. Efter dragningen visade de r6r, som behandlats i baden enligt uppfinningen, en vasentligt ljusare, nastan blank yta, under det att j5.mforelseroren fortfarande uppvisade vasentliga Aterstoder av fosfatskikt och smorjmedel. Baden kompletterades med det ovan angivna koncentratet till konstant zink- och fosfathalt. Vid kompletteringen tillsattes kondenserat fosfat i sadan mangd, att till badet, raknat per m2 behandlad yta, sattes 0,5 g natriumhexametafosfat resp. 1 g pentanatriumtripolyfosfat.
Claims (4)
1. FOrfarande for kallbearbetning med hj alp av zinkfosfat innehallande Overdrag fOr arbetsstycken, som endast aro avsedda att nom kallbearbetningen undergâ en linga till mattlig deformation och soon efter kallbearbetningen ej skola uppvisa nagra ytterligare bearbetningen storande rester av fosfatskiktet pa ytan, kannetecknat darav, att arbetsstyckena hehandlas med fosfateringslosningar som innehalla oxidationsmedel och zinkfosfat samt minst ett kondenserat fosfat, isytmerhet pyro-, tripoly- oiler hexametafosfat, i mangder av 0,01-0,8 g/1, raknat som alkalimetallsaltet av den ifragavarande kondenserade fosforsyran.
2. F6rfarande enligt patentanspraket 1, kannetecknat darav, att man for komplettering av fosfateringslosningarna tillsatter 0,12,5 g kondenserat fosfat per in behandlad yta.
3. Forfarande enligt patentanspraket 2, kannetecknat darav, att fosfatskiktet Ofores med hjalp av en nitritaccelerator liksom aven minst ett kondenserat fosfat innehallande losning, som kompletteras med sá stor mangd nitrit, att vid kompletteringen forhallandet nitrit:kondenserat fosfat utgor 2: 1 till 1: 6 10- retradesvis 1:2 till 1:
4., Anforda publikationer: Patentskrifter frcin Frankrike 1 138 208; Storbritannien 530 006, 604 325; USA 2 758 919, 2 826 517.
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