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Hole sealant free molten zinc-aluminum corrosion resisting coating material and preparation method thereof

A technique for corroding coatings and coating materials, applied in the field of molten zinc-aluminum corrosion-resistant coating materials and their preparation

Active Publication Date: 2018-04-13
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of the thermal spraying process itself, it is difficult to ensure that all the flattened powders are completely superimposed, so there must be pores in the thermal spraying coating prepared under the current process conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The embodiment of the present invention provides a preparation method of a molten zinc-aluminum corrosion-resistant coating material free of sealing agent, which is used to prepare the coating material of the present invention, comprising the following steps:

[0024] Step 1: Using the material for preparing cermet powder and the whiskers of the melting-zinc erosion-resistant material as raw materials, wherein the whiskers of the melting-zinc erosion-resistant material account for 0.5-2% of the total weight of the raw materials, and the rest is used to prepare the cermet Raw material for powder;

[0025] Step 2: Add deionized water to the raw materials in the above step 1 to make a wet grinding medium, add polyvinyl alcohol or polyethylene glycol accounting for 1 to 6% of the total weight of the raw materials as a binder, and ball mill for 12 to 48 hours to prepare get mixed slurry;

[0026] Step 3: The mixed slurry prepared in the above step 2 is spray-dried to obtain...

Embodiment 1

[0036] The embodiment of the present invention provides a method for preparing a molten zinc-aluminum corrosion-resistant coating material without a sealing agent. The prepared cermet powder is WC-12Co thermal spray powder, which includes the following steps:

[0037] 1) Take 87kg of WC powder, 1kg of aluminum borate whiskers, 12kg of cobalt powder, the particle size of WC powder is 1-3μm, the diameter of aluminum borate whiskers is 0.5-1μm, the length is 3-8μm, and the particle size of cobalt powder is 1.5μm;

[0038] 2) Add deionized water to the above raw materials to make a wet grinding medium, add 2 kg of polyvinyl alcohol as a binder, and ball mill for 24 hours to prepare a mixed slurry;

[0039] 3) Agglomerated particles were obtained by spray-drying the above-mentioned mixed slurry; wherein, the inlet temperature of the centrifugal spray drying equipment was 220°C, the outlet temperature was 110°C, the rotation speed of the atomizing disc was 10000r / min, and the feeding...

Embodiment 2

[0043] The embodiment of the present invention provides a method for preparing a molten zinc-aluminum corrosion-resistant coating material without a sealing agent. The prepared cermet powder is WC-WB-Co thermal spray powder, which includes the following steps:

[0044]1) Take WC powder 59.5kg, WB powder 29.5kg, aluminum borate whisker 1kg, cobalt powder 10kg, WC powder particle size is 1-3μm, WB powder particle size is 1-5μm, aluminum borate whisker diameter is 1-2μm, length 5-15μm, the particle size of cobalt powder is 1.5μm;

[0045] 2) Add deionized water to the above raw materials to make a wet grinding medium, add 2.4 kg of polyethylene glycol as a binder, and ball mill for 30 hours to prepare a mixed slurry;

[0046] 3) Agglomerated particles were obtained by spray-drying the above-mentioned mixed slurry; wherein, the inlet temperature of the centrifugal spray drying equipment was 220°C, the outlet temperature was 110°C, the rotation speed of the atomizing disc was 12000...

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Abstract

The invention discloses a hole sealant free molten zinc-aluminum corrosion resisting coating material and a preparation method thereof. According to the material, whiskers of a molten zinc corrosion resisting material are added to the surface of metal ceramic thermal spraying powder, and the whiskers of the molten zinc corrosion resisting material can exist on the surfaces of flattened thermal spraying particles after spraying. By means of the coating material, on one hand, a layer of molten zinc corrosion resisting material is attached to the surfaces of holes formed by the coating, wettability of molten zinc-aluminum or molten aluminum-zinc to a coating is reduced, and the situation that molten metal liquid corrodes the coating along the holes of the coating is reduced; and on the otherhand, whisker reinforcement is achieved between well-overlapped flattened particles, and the strength and thermal shock resistance of the coating are improved.

Description

technical field [0001] The invention relates to the field of preparation of corrosion coating materials, in particular to a molten zinc-aluminum corrosion-resistant coating material without a sealing agent and a preparation method thereof. Background technique [0002] Hot-dip galvanizing technology is the most economical and effective method to prevent steel materials from corroding in the natural environment. Steel components treated by hot-dip galvanizing have excellent corrosion resistance in corrosive environments such as atmosphere, seawater, and soil. At present, most steel strip hot-dip coating units in iron and steel enterprises use sinking roll devices. The sinking rolls completely immersed in molten zinc and aluminum are strongly corroded by the zinc liquid, which directly affects the surface quality of galvanized steel sheets and reduces the cost of the enterprise. Production efficiency, increase production cost. It is the most common practice in the iron and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/126B22F9/04
CPCB22F9/04B22F2009/043C23C4/06C23C4/126
Inventor 高峰沈婕李杰王玉卢晓亮邓霞
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY