CN218642830U - Coating structure for passivation of zinc-plated trivalent chromium and silane chromium-free passivation - Google Patents
Coating structure for passivation of zinc-plated trivalent chromium and silane chromium-free passivation Download PDFInfo
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- CN218642830U CN218642830U CN202122944159.7U CN202122944159U CN218642830U CN 218642830 U CN218642830 U CN 218642830U CN 202122944159 U CN202122944159 U CN 202122944159U CN 218642830 U CN218642830 U CN 218642830U
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Abstract
The utility model discloses a zinc-plating trivalent chromium passivation adds coating structure of silane chromium-free passivation, including cast iron, steel and zinc alloy base member and galvanizing coat, trivalent chromium passivation layer and the silane chromium-free passivation layer of preparing in proper order from inside to outside on the metal base member. The utility model discloses a cladding material structure has good corrosion resistance to overcome the technical defect that the trivalent chromium passivation layer does not possess self-repairing nature.
Description
Technical Field
The utility model belongs to the field of metal plating, in particular to a plating layer structure of zinc-plating trivalent chromium passivation and silane chromium-free passivation.
Background
Trivalent chromium passivation instead of hexavalent chromium passivation is widely applied to mass production, and good environmental benefits are obtained. However, the trivalent chromium passivation layer does not have the self-repairing property of the hexavalent chromium passivation layer, and the trivalent chromium passivation layer becomes a short plate in the existing corrosion prevention technology. How to solve the problem that trivalent chromium passivation does not have self-repairing property is a hot spot of current research in the industry.
Disclosure of Invention
In order to overcome the technical defect that the trivalent chromium passivation of the zinc coating does not have self-repairability, the utility model provides a plating layer structure of the passivation of the trivalent chromium of galvanization and the silane chromium-free passivation. In order to achieve the purpose, the utility model adopts the following technical scheme:
A coating structure for passivation of trivalent chromium in zinc plating and silane chromium-free passivation comprises a metal matrix, and a zinc coating, a trivalent chromium passivation layer and a silane chromium-free passivation layer which are sequentially prepared on the metal matrix from inside to outside;
the silane chromium-free passivation layer is prepared by adopting a solvent type silane passivating agent.
In some embodiments, the thickness of the silane chromium-free passivation layer is 0.5-1.0 μm.
In some of these embodiments, the zinc coating is prepared using a potassium chloride galvanizing process.
In some of these embodiments, the galvanized layer has a thickness of 5 to 17 μm.
In some of these embodiments, the metal matrix is cast iron.
In some of these embodiments, the metal matrix is steel.
In some of these embodiments, the metal matrix is a zinc alloy.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a plating layer structure of zinc-plating trivalent chromium passivation and silane chromium-free passivation, which adopts trivalent chromium passivation and then carries out silane chromium-free passivation, and the silane chromium-free passivation layer has self-repairability and can overcome the technical defect that the trivalent chromium passivation layer does not have self-repairability;
2. The coating structure of the passivation of the galvanized trivalent chromium and the silane chromium-free passivation has excellent corrosion resistance.
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 layer in 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.
The workpiece substrate is subjected to oil removal, wax removal, rust removal and activation according to the existing pretreatment process.
After the pretreatment of the workpiece, the workpiece is galvanized according to the current potassium chloride galvanizing process.
Preferably, the zinc is plated by using a DETRONZIN 406 low-foam potassium chloride galvanizing process developed by Guangzhou ultra-Pont chemical company Limited, and the galvanizing process is as follows:
50-70 g/L of zinc chloride, 180-220 g/L of potassium chloride, 25-35 g/L of boric acid, 0.8-1.5 mL/L of DETRONZIN 406 brightener, 25-35 mL/L of DETRONZIN 406 softener, 15-30 ℃, 4.8-5.6 of pH and 1-4A/dm of cathode current density 2 。
After the workpiece is galvanized, the trivalent chromium passivation layer is prepared by adopting the existing trivalent chromium passivation process.
Preferably, the trivalent chromium passivation layer is prepared by TRIROS 341 trivalent chromium passivating agent produced by ultra-high chemical industry:
TRIROS 341 trivalent chromium passivator 40-60 mL/L, the pH value of the passivating solution is 3.8-4.2, the passivating temperature is 20-30 ℃, the plated part is stirred or swung by air, and the passivating time is 15-30 s.
And (3) drying the passivated workpiece, and passivating the passivated workpiece by using a silane chromium-free passivating agent.
Preferably, silane chromium-free passivator produced by ultra-bond chemical industry is adopted for passivation: the zinc PRODICO Z-Caot 888 FL silane chromium-free passivating agent is prepared by the following passivating process:
passivating agent: the zinc can be PRODICO Z-Caot 888 FL is solvent type, and is used as stock solution,
operating temperature: at the room temperature, the reaction solution is mixed,
passivation time: the time of the reaction is 30 to 90 seconds,
and (3) drying: baking for 18-25 min at 80-100 ℃.
Example 1:
as shown in figure 1, the coating structure of the passivation of the galvanized trivalent chromium and the silane chromium-free passivation comprises a cast iron base body 1, and a zinc coating layer 2, a trivalent chromium passivation layer 3 and a silane chromium-free passivation layer 4 which are sequentially prepared on the cast iron base body 1 from inside to outside.
The zinc coating 2 is prepared by adopting a DETRONZIN 406 low-foam potassium chloride zinc plating process, and the thickness of the coating is 12-14 mu m.
60g/L of zinc chloride, 200g/L of potassium chloride, 30g/L of boric acid, 1mL/L of DETRONZIN 406 brightener, 30mL/L of DETRONZIN 406 softener, 22 ℃ of temperature, 5.2 of pH and 2.5A/dm of cathode current density 2 。
The trivalent chromium passivation layer 3 is passivated by adopting a TRIROS 341 trivalent chromium passivation process:
50mL/L of TRIROS 341 trivalent chromium passivator, 4 pH value of passivation solution, 22 ℃ of passivation temperature, stirring or swinging the plated part in air, and passivating for 30s.
The silane chromium-free passivation layer 4 is prepared by adopting a zinc Cuctite PRODICO Z-Caot 888 FL silane chromium-free passivator, and the passivation process is as follows:
passivating agent: the zinc can be PRODICO Z-Caot 888 FL is solvent type, and is used as stock solution,
operating temperature: at the room temperature, the reaction solution is mixed,
passivation time: for 80s of the time period of the first time period,
drying: baking at 90 deg.C for 20min.
The specific operation of this 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. Galvanizing: after pretreatment of the plated part, the zinc coating 2 is prepared according to the DETRONZIN 406 low-foam potassium chloride galvanizing process.
3. Passivation of trivalent chromium: the plating piece is subjected to light extraction by nitric acid with the volume fraction of 1% for 2-4 s → washing → trivalent chromium passivation → washing → drying to prepare the trivalent chromium passivation layer 3.
4. Silane chromium-free passivation: and performing 'silane chromium-free passivation on the trivalent chromium passivation layer 3 → blowing off the residual liquid drops at the bottom of the rack plating part by using high-pressure air → drying and curing' to prepare the silane chromium-free passivation layer 4.
Example 2:
as shown in figure 1, the coating structure for passivation of trivalent chromium in zinc plating and silane chromium-free passivation comprises a steel substrate 1, and a zinc coating 2, a trivalent chromium passivation layer 3 and a silane chromium-free passivation layer 4 which are sequentially prepared on the steel substrate 1 from inside to outside.
The zinc coating 2 is prepared by adopting a DETRONZIN 406 low-foam potassium chloride zinc plating process, and the thickness of the coating is 10-12 mu m.
55g/L of zinc chloride, 190g/L of potassium chloride, 25g/L of boric acid, 1mL/L of DETRONZIN 406 brightener, 28mL/L of DETRONZIN 406 softener, 18 ℃ of temperature, 4.8 of pH and 2A/dm of cathode current density 2 。
The trivalent chromium passivation layer 3 is passivated by adopting a TRIROS 341 trivalent chromium passivation process:
the passivation method comprises the following steps of 40mL/L of TRIROS 341 trivalent chromium passivator, 3.8 of pH value of passivation solution, 25 ℃ of passivation temperature, and 22s of passivation time, wherein a plated part is stirred or swung in air.
The silane chromium-free passivation layer 4 is prepared by adopting a zinc Cuctite PRODICO Z-Caot 888 FL silane chromium-free passivator, and the passivation process is as follows:
passivating agent: the zinc can be used as solvent type PRODICO Z-Caot 888 FL, and stock solution,
Operating temperature: at the room temperature, the reaction solution is mixed,
passivation time: for 60s of the time period of the first time period,
and (3) drying: baking at 80 deg.C for 25min.
The specific operation of this embodiment is divided into the following steps:
1. pretreatment: the iron and steel 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. Galvanizing: after pretreatment of the plated part, the zinc coating 2 is prepared according to the DETRONZIN 406 low-foam potassium chloride galvanizing process.
3. Passivation of trivalent chromium: and (3) preparing a trivalent chromium passivation layer 3 by the plating piece through brightening with 1% nitric acid for 2-4 s → washing → trivalent chromium passivation → washing → drying.
4. Silane chromium-free passivation: and (3) performing silane chromium-free passivation on the trivalent chromium passivation layer 3, blowing off the residual liquid drops at the bottom of the rack-plated part by using high-pressure air, drying and curing to prepare a silane chromium-free passivation layer 4.
Example 3:
as shown in figure 1, the coating structure for the passivation of trivalent chromium in zinc plating and the silane chromium-free passivation comprises a zinc alloy die casting base body 1, and a zinc plating layer 2, a trivalent chromium passivation layer 3 and a silane chromium-free passivation layer 4 which are sequentially prepared on the zinc alloy die casting base body 1 from inside to outside.
The zinc coating 2 is prepared by adopting a DETRONZIN 406 low-foam potassium chloride zinc plating process, and the thickness of the coating is 14-16 mu m.
65g/L of zinc chloride, 210g/L of potassium chloride, 32g/L of boric acid, 1mL/L of DETRONZIN 406 brightener, 32mL/L of DETRONZIN 406 softener, 25 ℃ of temperature, 5.4 of pH and 3A/dm of cathode current density 2 。
The trivalent chromium passivation layer 3 is passivated by adopting a TRIROS 341 trivalent chromium passivation process:
the TRIROS 341 trivalent chromium passivator is 40mL/L, the pH value of the passivation solution is 4.2, the passivation temperature is 30 ℃, the plated part is stirred or swung by air, and the passivation time is 30s.
The silane chromium-free passivation layer 4 is prepared by adopting a zinc Cuctite PRODICO Z-Caot 888 FL silane chromium-free passivator, and the passivation process is as follows:
passivating agent: the zinc can be PRODICO Z-Caot 888 FL is solvent type, and is used as stock solution,
operating temperature: at the room temperature, the reaction mixture is mixed,
passivation time: for 60s of the time period of the first time period,
drying: baking at 100 deg.C for 18min.
The specific operation of this embodiment is divided into the following steps:
1. pretreatment: the zinc alloy die casting base body 1 is subjected to the process of ultrasonic dewaxing → water washing → chemical degreasing → water washing → bleaching → water washing → acid salt activation → water washing.
2. Galvanizing: after pretreatment of the plated part, the zinc coating 2 is prepared according to the DETRONZIN 406 low-foam potassium chloride galvanizing process.
3. Passivation of trivalent chromium: and (3) preparing a trivalent chromium passivation layer 3 by the plating piece through brightening with 1% nitric acid for 2-4 s → washing → trivalent chromium passivation → washing → drying.
4. Silane chromium-free passivation: and (3) performing silane chromium-free passivation on the trivalent chromium passivation layer 3, blowing off the residual liquid drops at the bottom of the rack-plated part by using high-pressure air, drying and curing to prepare a silane chromium-free passivation layer 4.
The plating structures of the passivation of trivalent chromium in zinc plating and the silane chromium-free passivation prepared in the embodiments 1, 2 and 3 are subjected to a neutral salt spray test 384h according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no white corrosive substances are generated on the surface of a 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 (7)
1. A galvanized trivalent chromium passivation adds silane coating structure of chromium-free passivation, its characterized in that: the zinc-plated coating comprises a metal matrix, and a zinc-plated layer, a trivalent chromium passivation layer and a silane chromium-free passivation layer which are sequentially prepared on the metal matrix from inside to outside;
the silane chromium-free passivation layer is prepared by adopting a solvent type silane passivating agent.
2. The coating structure of trivalent chromium galvanised passivation plus silane chromium-free passivation as claimed in claim 1, characterized in that: the thickness of the silane chromium-free passivation layer is 0.5-1.0 mu m.
3. The coating structure of claim 1 having a trivalent chromium galvanization passivation plus silane chromium-free passivation, wherein: the zinc coating is prepared by adopting a potassium chloride galvanizing process.
4. The coating structure of claim 1 having a trivalent chromium galvanization passivation plus silane chromium-free passivation, wherein: the thickness of the zinc coating is 5-17 μm.
5. The coating structure of claim 1 having a trivalent chromium galvanization passivation plus silane chromium-free passivation, wherein: the metal matrix is cast iron.
6. The coating structure of claim 1 having a trivalent chromium galvanization passivation plus silane chromium-free passivation, wherein: the metal matrix is steel.
7. The coating structure of trivalent chromium galvanised passivation plus silane chromium-free passivation as claimed in claim 1, characterized in that: the metal matrix is zinc alloy.
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