Cr-free dacromet coating prepared through mechanical alloying and preparation method thereof

A mechanical alloying and coating technology, applied in anti-corrosion coatings, coatings, etc., can solve the problems affecting the anti-corrosion ability of the coating, the effect of the corrosion potential of the coating, and dangerous environmental pollutants, etc., to achieve high density, smooth surface, Good corrosion resistance

Inactive Publication Date: 2016-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The self-corrosion potentials of zinc and aluminum are -0.762V and -1.667V respectively. The zinc-aluminum coating formed by the combination of the two has a self-corrosion potential of about -1.1V, while the self-corrosion potential of general steel is 0.6 ~ -0.7V , in electrochemical protection, the more negative the potential of the coating, the more obvious the protective effect of the sacrificial anode, so when the workpiece is in a corrosive medium, the primary battery composed of coating and steel, the coating will act as an anode to lose electrons slowly Corrosion to protect the steel, but the Dacromet coating liquid prepared at present, flake zinc powder and aluminum powder are directly mixed in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of chrome-free dacromet paint is prepared by the following method:

[0030] (1) Preparation of metal alloy slurry: take 200g metal powder, wherein the mass ratio of zinc powder and aluminum powder is 5:1, add the mixed powder to the ball mill jar, and add stearin with a mass ratio of 4% to the metal powder at the same time Acid is used as a process control agent, and then the ball mill jar is sealed and then evacuated, and argon is introduced for protection. After ball milling for 6 hours, a scaly metal alloy powder is obtained, and then a wetting agent (polyethylene glycol) of the same quality as the metal powder is added. 400), ball milling under the same conditions for 6 hours, the milling temperature should be kept at normal temperature; the ball-to-material ratio of the ball milling is 10:1, the ball milling speed is 400r / min, and the metal alloy slurry is obtained after the ball milling ends. Considering that the friction between the tank body and the balls...

Embodiment 2

[0037] A kind of chrome-free dacromet coating is prepared by the following method:

[0038](1) Preparation of metal alloy slurry: take 180g of metal powder, wherein the mass ratio of zinc powder and aluminum powder is 6:1, add the mixed powder to the ball mill jar, and add stearin with a mass ratio of 4% to the metal powder at the same time Acid is used as a process control agent, and then the ball mill jar is sealed and then evacuated, and argon is introduced for protection. After ball milling for 6 hours, a scaly metal alloy powder is obtained, and then a wetting agent (polyethylene glycol) of the same quality as the metal powder is added. 400), ball milling under the same conditions for 6 hours, the milling temperature should be kept at normal temperature; the ball-to-material ratio of the ball milling is 11:1, the ball milling speed is 450r / min, and the metal alloy slurry is obtained after the ball milling finishes. Considering that the friction between the tank body and t...

Embodiment 3

[0045] A kind of chrome-free dacromet coating is prepared by the following method:

[0046] (1) Preparation of metal alloy slurry: take 150g of metal powder, wherein the mass ratio of zinc powder and aluminum powder is 7:1, add the mixed powder to the ball mill jar, and add stearin with a mass ratio of 4% to the metal powder at the same time Acid is used as a process control agent, and then the ball mill jar is sealed and then evacuated, and argon is introduced for protection. After ball milling for 6 hours, a scaly metal alloy powder is obtained, and then a wetting agent (polyethylene glycol) of the same quality as the metal powder is added. 400), ball milling under the same conditions for 6.5h, the ball milling temperature should be kept at normal temperature; the ball-to-material ratio of the ball milling is 12:1, the ball milling speed is 500r / min, and the metal alloy slurry is obtained after the ball milling ends. Considering that the friction between the tank body and th...

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PUM

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Abstract

The invention belongs to the field of coatings and particularly relates to a Cr-free dacromet coating prepared through mechanical alloying and a preparation method thereof.The Cr-free dacromet coating is prepared from, by mass, 50-55% of metal alloy slurry, 40-45% of a Cr-free passivation solution and 3-6% of a related auxiliary agent.The metal alloy slurry is prepared from metal alloyed powder and a wetting agent through a ball milling technology.The metal alloyed powder is prepared from sheet zinc powder and sheet aluminum powder through ball milling mechanical alloying.The mass ratio of the zinc powder to the aluminum powder is (5:1)-(9:1).The total mass of the zinc powder and the aluminum powder is the same as the mass of the wetting agent.The obtained Cr-free dacromet coating is more stable in performance and low in porosity, few microscopic cracks and holes of the coating exist, the compactness of the coating is high, the corrosion resistance of the coating is good, and the environmental requirement is met on the premise that the performance requirement is met.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a chromium-free dacromet coating prepared by mechanical alloying and a preparation method thereof. Background technique [0002] Dacromet coating, also known as zinc-chromium coating or zinc-aluminum coating, is a kind of anti-corrosion coating with simple process but excellent corrosion resistance. This technology comes from the western automobile industry. Dacromet technology is to apply the coating solution made of flake zinc powder, flake aluminum powder, chromic anhydride, wetting agent, dispersant, reducing agent, deionized water and other additives on the surface of steel and other substrates. Dry at about 330°C, and form a coating with excellent corrosion resistance on the surface of the metal substrate after curing and sintering. During the sintering process of Dacromet coating, chromic acid will undergo complex chemical reactions with the flake zinc-aluminum powder ...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/10C09D7/12
CPCC09D1/00C09D5/103C09D5/106C09D7/63C09D7/65
Inventor 程旭东刘彬李邦
Owner WUHAN UNIV OF TECH
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