CN211170931U - Iron casting zinc-plating and hydroxyl graphene closed plating structure - Google Patents
Iron casting zinc-plating and hydroxyl graphene closed plating structure Download PDFInfo
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- CN211170931U CN211170931U CN201920602123.0U CN201920602123U CN211170931U CN 211170931 U CN211170931 U CN 211170931U CN 201920602123 U CN201920602123 U CN 201920602123U CN 211170931 U CN211170931 U CN 211170931U
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Abstract
The utility model discloses an iron casting zinc-plating and hydroxyl graphite alkene confined cladding layer structure, including the iron casting base member and the acid galvanizing coat, alkaline galvanizing coat, trivalent chromium passivation layer and the nanometer graphite alkene confined layer that prepare in proper order from inside to outside on the iron casting base member. The utility model discloses an iron casting zinc-plating and hydroxyl graphite alkene confined cladding material structure carries out neutral salt fog test 276 hours according to GB/T10125 + 2012 "artificial atmosphere corrosion test salt fog test", and the piece surface that plates does not have white corrosive substance and generates, has good corrosion resistance.
Description
Technical Field
The utility model belongs to the metal plating field, concretely relates to ironcasting zinc-plating and hydroxyl graphene closed cladding material structure.
Background
The surface of the iron casting contains more carbon particles, water molecules have a strong tendency to generate electrolytic reaction on the surface of the carbon particles when the iron casting is electroplated, and if the cyanide-free alkaline galvanizing process is adopted for galvanizing, the electrolytic reaction of the water molecules is dominant, so that the zinc cannot be deposited. Although zinc can be deposited on the iron casting by adopting the traditional acid galvanizing, a large amount of hydrogen bubbles generated by electrolysis of water molecules on the surface of carbon particles at the beginning of electroplating float above the plating solution, and explosion is easy to occur. The corrosion resistance of the acid zinc coating is generally lower than that of cyanide-free alkaline zinc coating, and the iron casting adopting the acid zinc coating as a protective layer often cannot meet the technical requirements of automobile parts.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of low zinc plating corrosion resistance of the iron casting and a large amount of bubbles generated during acid zinc plating, the utility model provides a zinc plating and hydroxyl graphene closed plating layer structure of the iron casting. In order to achieve the purpose, the utility model adopts the following technical scheme:
a zinc-plated and hydroxyl graphene-sealed coating structure for an iron casting comprises an iron casting base body, and an acid zinc-plated layer, an alkaline zinc-plated layer, a trivalent chromium passivation layer and a nano graphene sealing layer which are sequentially prepared on the iron casting base body from inside to outside.
Preferably, the nano graphene sealing layer is prepared by adopting a novel hydroxyl graphene sealing agent.
Preferably, the novel hydroxyl graphene sealing agent is a hydroxyl graphene sealing agent developed by Guangzhou ultra-Pont chemical Co.
Preferably, the hydroxyl graphene sealing agent comprises, by weight, 20-30 parts of silica sol, 20-30 parts of PU 113 water-soluble silane polymer produced by Taiwan Dajin chemical industry, 4-8 parts of hydroxyl graphene with the mass fraction of 3.8%, 0.4-0.6 part of TANAOAMS organic silicon defoaming agent produced by Dutch Tuona, 0.8-1.5 parts of L A13-863 organic silicon leveling agent produced by Dutch Turkel and 30-50 parts of deionized water.
Preferably, the hydroxy graphene sealant is diluted by 3 times with water to prepare a sealant solution.
Preferably, the plated part after zinc plating passivation is immersed in a sealing liquid to prepare the nano graphene sealing layer.
Preferably, the thickness of the nano graphene sealing layer is 0.2-1 μm.
Preferably, the acid zinc coating is prepared by adopting a low-foam potassium chloride zinc coating process, and the thickness of the coating is 5-12 μm.
Preferably, the alkaline zinc coating is prepared by a cyanide-free alkaline zinc plating process, and the thickness of the coating is 5-12 μm.
Preferably, the passivation layer is prepared by adopting a three-chromium passivation process.
Preferably, the trivalent chromium passivation process comprises a trivalent chromium blue passivation process, a trivalent chromium color passivation process and a trivalent chromium black passivation process.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a galvanized and hydroxyl graphene closed plating layer structure of an iron casting, which adopts a hydroxyl graphene sealant to replace the traditional sealant, thus obviously improving the corrosion resistance of the plating layer;
2. the acid zinc coating is prepared by adopting a low-foam potassium chloride galvanizing process, so that the technical defect that a large amount of bubbles are generated in the acid galvanizing of the iron casting is overcome;
3. the alkaline zinc coating is prepared on the acid zinc coating by a cyanide-free alkaline zinc coating process, so that the corrosion resistance of the zinc coating can be improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is a schematic diagram of the structure of the plating layers of examples 1, 2 and 3 of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
as shown in fig. 1, the coating structure for zinc plating and hydroxyl graphene sealing of an iron casting comprises an iron casting base body 1, and an acid zinc plating layer 2, an alkaline zinc plating layer 3, a trivalent chromium blue passivation layer 4 and a nano graphene sealing layer 5 which are sequentially prepared from inside to outside on the iron casting base body 1.
The acid zinc coating 2 is prepared by a ZIN L ITE 406 low-foam potassium chloride zinc plating process of ultra-high chemical engineering, and the thickness of the coating is 6-8 mu m.
The alkaline zinc coating 3 is prepared by a Detron 2699 cyanide-free alkaline zinc plating process in the ultra-high chemical industry, and the thickness of the coating is 6-8 mu m.
The trivalent chromium blue passivation layer 4 is prepared by TRIROS TCP-185 trivalent chromium blue passivator in the super-bonding chemical industry.
The nano graphene sealing layer 5 is prepared from a hydroxyl graphene sealing agent in the ultra-bonding chemical industry.
The hydroxyl graphene modified sealing agent comprises, by weight, 20 parts of silica sol, 30 parts of PU 113 water-soluble silane polymer, 5 parts of hydroxyl graphene with the mass fraction of 3.8%, 0.5 part of TANAOAMS organic silicon defoamer, 1 part of L A13-863 organic silicon leveling agent and 40 parts of deionized water.
And diluting the hydroxyl graphene sealant by 3 times with water to prepare a sealant.
And dipping the galvanized and passivated plated part in a sealing liquid to prepare the nano graphene sealing layer.
The thickness of the prepared nano graphene sealing layer is 0.4-0.6 mu m.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the cast iron component substrate 1 is subjected to the steps of "alkaline chemical degreasing → washing with water → washing with acid → washing with water → alkaline cathodic electrolytic degreasing → washing with water → alkaline anodic electrolytic degreasing → washing with water → activation → washing with water".
2. Acid zinc coating 2: after pretreatment of the plated part, acid galvanizing → water washing is carried out to prepare an acid galvanized layer 2.
3. Alkaline zinc plating layer 3: after acid galvanizing, alkaline galvanizing → water washing is carried out to prepare an alkaline galvanizing layer 3.
4. Trivalent chromium blue passivation layer 4: and (3) preparing a trivalent chromium blue passivation layer 4 on the alkaline zinc coating by 'light extraction with dilute nitric acid with the volume fraction of 1% → water washing → trivalent chromium blue passivation → water washing'.
5. Nano graphene sealing layer 5: passivating the plated part, and then carrying out' dipping graphene sealing liquid → discharging from a tank → dripping → blowing off the sealing liquid left at the bottom of the plated part by high-pressure air → 70ｏC～100ｏAnd C, baking to prepare the nano graphene sealing layer 5.
The iron casting galvanized and hydroxyl graphene closed plating structure prepared in the embodiment 1 is subjected to a neutral salt spray test for 300 hours according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no white corrosive substance is generated on the surface of the plated part.
Example 2:
as shown in fig. 1, the coating structure for zinc plating and hydroxyl graphene sealing of an iron casting comprises an iron casting base body 1, and an acid zinc plating layer 2, an alkaline zinc plating layer 3, a trivalent chromium color passivation layer 4 and a nano graphene sealing layer 5 which are sequentially prepared from inside to outside on the iron casting base body 1.
The acid zinc coating 2 is prepared by a ZIN L ITE 406 low-foam potassium chloride zinc plating process of ultra-high chemical engineering, and the thickness of the coating is 8-10 mu m.
The alkaline zinc coating 3 is prepared by a Detron 2699 cyanide-free alkaline zinc plating process in the ultra-high chemical industry, and the thickness of the coating is 5-7 mu m.
The trivalent chromium color passivation layer 4 is prepared by TRIROS TYP-161 trivalent chromium color passivator in the super-nation chemical industry.
The nano graphene sealing layer 5 is prepared from a hydroxyl graphene sealing agent in the ultra-bonding chemical industry.
The hydroxyl graphene modified sealing agent comprises, by weight, 30 parts of silica sol, 20 parts of PU 113 water-soluble silane polymer, 6 parts of hydroxyl graphene with the mass fraction of 3.8%, 0.5 part of TANAOAMS organic silicon defoamer, 1 part of L A13-863 organic silicon leveling agent and 40 parts of deionized water.
And diluting the hydroxyl graphene sealant by 3 times with water to prepare a sealant.
And dipping the galvanized and passivated plated part in a sealing liquid to prepare the nano graphene sealing layer.
The thickness of the prepared nano graphene sealing layer is 0.4-0.6 mu m.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the cast iron component substrate 1 is subjected to the steps of "alkaline chemical degreasing → washing with water → washing with acid → washing with water → alkaline cathodic electrolytic degreasing → washing with water → alkaline anodic electrolytic degreasing → washing with water → activation → washing with water".
2. Acid zinc coating 2: after pretreatment of the plated part, acid galvanizing → water washing is carried out to prepare an acid galvanized layer 2.
3. Alkaline zinc plating layer 3: after acid galvanizing, alkaline galvanizing → water washing is carried out to prepare an alkaline galvanizing layer 3.
4. Trivalent chromium color passivation layer 4: the trivalent chromium color passivation layer 4 is prepared by performing ' light extraction by dilute nitric acid with volume fraction of 1% > ' washing with water → trivalent chromium color passivation → washing with water ' on the alkaline zinc plating layer.
5. Nano graphene sealing layer 5: passivating the plated part, and then carrying out' dipping graphene sealing liquid → discharging from a tank → dripping → blowing off the sealing liquid left at the bottom of the plated part by high-pressure air → 70ｏC～100ｏAnd C, baking to prepare the nano graphene sealing layer 5.
The iron casting galvanized and hydroxyl graphene closed plating structure prepared in the embodiment 2 is subjected to a neutral salt spray test for 336 hours according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no white corrosive substance is generated on the surface of the plated part.
Example 3:
as shown in fig. 1, the coating structure for zinc plating and hydroxyl graphene sealing of an iron casting comprises an iron casting base body 1, and an acid zinc plating layer 2, an alkaline zinc plating layer 3, a trivalent chromium black passivation layer 4 and a nano graphene sealing layer 5 which are sequentially prepared from inside to outside on the iron casting base body 1.
The acid zinc coating 2 is prepared by a ZIN L ITE 406 low-foam potassium chloride zinc plating process of ultra-high chemical engineering, and the thickness of the coating is 5-7 mu m.
The alkaline zinc coating 3 is prepared by a Detron 2699 cyanide-free alkaline zinc plating process in the ultra-high chemical industry, and the thickness of the coating is 8-10 mu m.
The trivalent chromium black passivation layer 4 is prepared by TRIROS BP-889 trivalent chromium black passivator in the super-bonding chemical industry.
The nano graphene sealing layer 5 is prepared from a hydroxyl graphene sealing agent developed by ultra-bond chemical limited company.
The hydroxyl graphene modified sealing agent comprises, by weight, 25 parts of silica sol, 25 parts of PU 113 water-soluble silane polymer, 4 parts of hydroxyl graphene with the mass fraction of 3.8%, 0.5 part of TANAOAM S organic silicon defoamer, 1 part of L A13-863 organic silicon leveling agent and 40 parts of deionized water.
And diluting the hydroxyl graphene sealant by 3 times with water to prepare a sealant.
And dipping the galvanized and passivated plated part in a sealing liquid to prepare the nano graphene sealing layer.
The thickness of the nano graphene sealing layer is 0.4-0.6 mu m.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the cast iron component substrate 1 is subjected to the steps of "alkaline chemical degreasing → washing with water → washing with acid → washing with water → alkaline cathodic electrolytic degreasing → washing with water → alkaline anodic electrolytic degreasing → washing with water → activation → washing with water".
2. Acid zinc coating 2: after pretreatment of the plated part, acid galvanizing → water washing is carried out to prepare an acid galvanized layer 2.
3. Alkaline zinc plating layer 3: after acid galvanizing, alkaline galvanizing → water washing is carried out to prepare an alkaline galvanizing layer 3.
4. Trivalent chromium black passivation layer 4: the trivalent chromium black passivation layer 4 is prepared by 'light extraction by dilute nitric acid with volume fraction of 1% → water washing → trivalent chromium black passivation → water washing' on the alkaline zinc plating layer.
5. Nano graphene sealing layer 5: passivating the plated part, and then carrying out' dipping graphene sealing liquid → discharging from a tank → dripping → blowing off the sealing liquid left at the bottom of the plated part by high-pressure air → 70ｏC～100ｏAnd C, baking to prepare the nano graphene sealing layer 5.
The iron casting galvanized and hydroxyl graphene closed plating structure prepared in the embodiment 3 is subjected to a neutral salt spray test for 276 hours according to GB/T10125-2012 salt spray test for Artificial atmosphere Corrosion test, and no white corrosive substance is generated on the surface of the plated part.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (5)
1. A galvanized and hydroxyl graphene closed plating layer structure of an iron casting is characterized in that: the iron casting comprises an iron casting base body, and an acid zinc coating, an alkaline zinc coating, a trivalent chromium passivation layer and a nano graphene sealing layer which are sequentially prepared on the iron casting base body from inside to outside;
the nano graphene sealing layer is prepared from a hydroxyl graphene sealing agent.
2. The iron casting zinc-plated and hydroxyl graphene closed plating structure as claimed in claim 1, wherein: the thickness of the nano graphene sealing layer is 0.2-1 mu m.
3. The iron casting zinc-plated and hydroxyl graphene closed plating structure as claimed in claim 1, wherein: the acid zinc coating is a coating prepared by adopting a low-foam potassium chloride galvanizing process, and the thickness of the coating is 5-12 mu m.
4. The iron casting zinc-plated and hydroxyl graphene closed plating structure as claimed in claim 1, wherein: the thickness of the alkaline zinc coating is 5-12 μm.
5. The iron casting zinc-plated and hydroxyl graphene closed plating structure as claimed in claim 1, wherein: the passivation layer is prepared by adopting a three-chromium passivation process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113463141A (en) * | 2021-06-28 | 2021-10-01 | 成都飞机工业（集团）有限责任公司 | Method for improving acid-resistant salt spray corrosion resistance of zinc coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113463141A (en) * | 2021-06-28 | 2021-10-01 | 成都飞机工业（集团）有限责任公司 | Method for improving acid-resistant salt spray corrosion resistance of zinc coating |
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