CN1312401A - Technological process of gear electroplating with Zn-Fe alloy and gear blockening deactivation - Google Patents
Technological process of gear electroplating with Zn-Fe alloy and gear blockening deactivation Download PDFInfo
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- CN1312401A CN1312401A CN 00113304 CN00113304A CN1312401A CN 1312401 A CN1312401 A CN 1312401A CN 00113304 CN00113304 CN 00113304 CN 00113304 A CN00113304 A CN 00113304A CN 1312401 A CN1312401 A CN 1312401A
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Abstract
The present invention relates to a zinc-iron electroplating process of gear and its blackening passivation process, and is characterized by that after cold-working and hot-working of gear in the course of gear production the surface of said gear is electroplated with zinc-iron alloy, the iron content of the alloy coat is less than 1%, and its non-corrosibility is obvious, and higher than that of other surface treatment process. Said alloy electroplating process incldues two steps, not only can make the coat possess high non-corrosibility, but also can prevent hydrogen from osmosizing in the course of electroplating to result in hydrogen brittleness.
Description
For a long time, Gear Production is after cold and hot working is finished, and the surface is through immersion oil, or bonderizing, or postprocessing working procedures such as blackout processing.Though these operations have certain rust-proof effect to gear, for the higher service condition of requirement for anticorrosion, especially, often need pass through long sea transport for the outlet gear, abominable corrosive environment can not meet the demands above-mentioned process of surface treatment.
In order to overcome above problem, we have invented electro-galvanizing or zinc base alloy on gear, carry out black passivation then and handle, and have both guaranteed the appearance of black of gear, and high preservative effect is arranged again.Through the gear of this art breading, even through long sea transport, abominable corrosive environment also can meet the demands.
Present invention resides in electroplating zn-fe alloy and black passivation treatment process on automobile gear or other gear.
Operational path of the present invention is: 1. zn-fe alloy and the black inactivation process of electroplating two layers of iron:
Gear → pre-treatment that mechanical workout is good → electro-galvanizing → iron alloy → cleaning → anneal (150 degree insulations 1-2 hour) → pre-treatment → electro-galvanizing → iron alloy → cleaning → black passivation → finished product
This iron plating process carries out in two steps, the first step is that plating piece carries out anneal (150 degree insulations 1-2 hour) at a certain temperature after electroplating zn-fe alloy for the first time, the hydrogen embrittlement that causes with the internal stress of eliminating coating with because of the electroplating process liberation of hydrogen, second step was to handle the back in dehydrogenation to continue to electroplate zn-fe alloy.
The outward appearance of coating: the coating surface smooth, visual no burr except that the corner has not had knurl, has burnt phenomenon.2. electroplate the zn-fe alloy technology of one deck iron:
Gear → pre-treatment that mechanical workout is good → electro-galvanizing → iron alloy → cleaning → black passivation → finished product
Alkaline zincate solution electroplating zn-fe alloy technology of the present invention, with the zinc oxide salt of deciding, sodium hydroxide is made the complexing agent of zine ion, molysite adopts ferrous sulfate, iron protochloride, ferric sulfate etc., complexing agent is with carboxylate salt, polyethylene polyamine etc., as Seignette salt, EDTA, quadrol, trolamine, gluconate, triethylene tetramine, tetraethylene pentamine, five ethene hexamines etc.The additive of plating bath is formed by the aminated compounds condensation.
Neutral oxide solution electroplating zn-fe alloy technology of the present invention, conducting salt adopts sodium-chlor or Repone K, main salt is with zinc chloride or zinc sulfate, molysite is with iron protochloride or ferrous sulfate, complexing agent is with Seignette salt, EDTA, Sunmorl N 60S, Trisodium Citrate etc., and adds a certain amount of reductive agent and make iron stabilizer.Additive is made up of carrier, brightening agent, auxiliary brightener etc.
Hydrosulphate solution electroplating zn-fe alloy technology of the present invention, ZnSO
47H
2O and FeSO
47H
2O is the main salt of plating bath, and what of its content have very big influence to the stability and the quality of coating of plating bath.Under the prerequisite that guarantees quality of coating, adopt high-content as far as possible, so that improve current density allowable, boost productivity.But too high levels, the cathodic polarization effect reduces, and the coating crystallization is coarse; Content is low excessively, and current density allowable reduces, and coating is lead, Fe
2+Form with complex ion in solution exists, and generates Fe (OH) if hydrolysis can take place too high levels
2Precipitation also can be oxidized to Fe
3+, influence the stability of plating bath.In addition, Zn
2+/ Fe
2+Ratio, will directly influence the quality of coating, its mol ratio can obtain the better coating of iron-holder between 0.4-0.7% (weight percent) between 8-12 the time.
Illustrate below in conjunction with embodiment:
Embodiment one:
Automobile gear is electroplating zn-fe alloy in table 1 solution, black passivation then, and coating black is polished bright.
Table 1 alkaline zincate electroplating zn-fe alloy electroplate liquid proportioning and electroplating technical conditions
Form and the processing parameter processing range
Zinc salt 22-25g/L
Ferrous sulfate 1-5g/L
Trolamine 1.5-7g/L
Sodium hydroxide 100-120g/L
Additive 4-6ml/L
D
k 3-5A/dm
2
Temperature 20-25 ℃
Embodiment two:
Gear is electroplating zn-fe alloy in table 2 solution, carries out black passivation then, and coating black is polished bright, and have hate sexual.
The neutral chloride soln electroplating zn-fe alloy of table 2 electroplate liquid proportioning and electroplating technical conditions
Form and the processing parameter processing range
Zinc chloride 80-100g/L
Repone K 180-220g/L
Ferrous sulfate 8-12g/L
Xitix 1.0-1.5g/L
Polyoxyethylene glycol 1.0-1.5g/L
Thiocarbamide 0.5-1.0g/L
Additive 10-20ml/L
PH 3.5-5.5
D
k 1-3A/dm
2
Temperature 10-40 ℃
SK: Sa 1.0: 1.5-2.0 example three:
Table 3 hydrosulphate solution electroplating zn-fe alloy electroplate liquid proportioning and electroplating technical conditions
Form and the processing parameter processing range
ZnSO
4·7H
2O 110-130g/L
FeSO
4·7H
2O 9.5-14.2g/L
Na
3Cit 30-45g/L
Brightening agent TF 14-18ml/L
(NH4)
2SO
4 80-100g/L
Xitix 0.1-0.2g/L
D
k 2-5A/dm
2
T 10-30
PH 2.2-3.5
Anode 0
#Zine plate
Although the content of brightening agent TF is few, quality of coating there is very big influence.When content hanged down, the coating obfuscation presented gray purple, and crystallization is thick not fine and close; Additive can decompose when content was high, and some can be mixed in the coating, made coating embrittlement, foaming, influenced the quality of coating, and consumption is within the 12-18ml/l scope usually.Neat with TF as light, can in sulfate system, obtain the Zn-Fe alloy coating that iron-holder is low, light is fine and close.
Embodiment four:
Gear is earlier with table 1 technology electro-galvanizing-iron (＜1%) alloy layer 10-15 μ m, and plating is after the certain temperature dehydrogenation is handled, and then activated back is with table 2 technology electroplating zn-fe alloy 5 μ m, black passivation again, and workpiece surface black is polished bright, and has hydrophobic nature.Coating is anti-corrosion and polarity.Plating back sample soaks in the 5%NaCl solution makes discoloration test, the not variable color of 2000h coating surface, and the time that white rust occurs is made neutral salt spray test greater than 2000h by GB6458-86, tests 7 weeks (168h), and passive film is variable color not, does not also have white rust and occurs.
Claims (5)
1. electroplate zn-fe alloy and black inactivation process thereof for one kind, comprise the plating zn-fe alloy, the Zn-Fe-P alloy, it is characterized in that this iron plating process carries out in two steps, the first step is that plating piece is heat-treated at a certain temperature after electroplating zn-fe alloy, the hydrogen embrittlement that causes with the internal stress of eliminating coating with because of the electroplating process liberation of hydrogen, second step was to handle the back in dehydrogenation to continue to electroplate zn-fe alloy.
2. as claim 1 described plating zn-fe alloy and black inactivation process, it is characterized in that: this process application anticorrosion after Gear Processing, particularly anticorrosion after automobile gear processing.
3. as claim 1 described plating zn-fe alloy and black inactivation process, it is characterized in that: comprise alkaline zincate solution plating zn-fe alloy technology, neutral chloride soln is electroplated zn-fe alloy technology, and hydrosulphate solution is electroplated zn-fe alloy technology.
4. as claim 1 described plating zn-fe alloy and black inactivation process, it is characterized in that: the iron level in the Zn-Fe alloy coating is less than 1%.
5, as claim 1 described plating zn-fe alloy and black inactivation process, it is characterized in that: comprise that also gear only electroplates one deck zinc-iron alloys and black passivation treatment process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00113304 CN1312401A (en) | 2000-03-06 | 2000-03-06 | Technological process of gear electroplating with Zn-Fe alloy and gear blockening deactivation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00113304 CN1312401A (en) | 2000-03-06 | 2000-03-06 | Technological process of gear electroplating with Zn-Fe alloy and gear blockening deactivation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1312401A true CN1312401A (en) | 2001-09-12 |
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ID=4583103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00113304 Pending CN1312401A (en) | 2000-03-06 | 2000-03-06 | Technological process of gear electroplating with Zn-Fe alloy and gear blockening deactivation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133651A (en) * | 2013-03-13 | 2013-06-05 | 苏州优金金属成型科技有限公司 | Corrosion-resisting gear |
| CN104499014A (en) * | 2014-12-15 | 2015-04-08 | 钢铁研究总院 | Neodymium-iron-boron electrogalvanizing iron weakly-acidic chloride system additive and preparation thereof |
-
2000
- 2000-03-06 CN CN 00113304 patent/CN1312401A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133651A (en) * | 2013-03-13 | 2013-06-05 | 苏州优金金属成型科技有限公司 | Corrosion-resisting gear |
| CN104499014A (en) * | 2014-12-15 | 2015-04-08 | 钢铁研究总院 | Neodymium-iron-boron electrogalvanizing iron weakly-acidic chloride system additive and preparation thereof |
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