A high-corrosion-resistant single-coated zinc-aluminum-magnesium rare earth protective coating and its preparation process

A preparation process, zinc-aluminum-magnesium technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of uneven coating surface, inability to form high-performance infiltration layer, and high process requirements, and achieve resistance to Excellent corrosion performance, overcoming difficulties in flux plating, and high bonding strength

Active Publication Date: 2018-05-29
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies and problems of hot-dip galvanized aluminum-magnesium in the prior art, such as high process requirements, uneven coating surface, and inability to form a high-performance infiltrated layer, the invention provides a high-content aluminum and magnesium coating suitable for metal materials. , The thickness of the coating conforms to the standard, high bonding strength, high corrosion resistance, high corrosion resistance single-coated zinc-aluminum-magnesium rare earth protective coating and preparation process suitable for industrial promotion and production

Method used

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  • A high-corrosion-resistant single-coated zinc-aluminum-magnesium rare earth protective coating and its preparation process
  • A high-corrosion-resistant single-coated zinc-aluminum-magnesium rare earth protective coating and its preparation process

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: A kind of highly corrosion-resistant single-plated zinc-aluminum-magnesium rare earth protective coating comprises the steps of:

[0031] 1) Decontaminate the dirt on the surface of the metal material, wash the metal material 3 times with NaOH solution and clear water at 85°C, and remove the grease on the surface of the metal material;

[0032] 2) Carry out grinding and derusting treatment on the metal material after the treatment in step 1), and the derusting level is not lower than Sa2 1 / 2 class;

[0033] 3) The single-plating flux is ZnCl 2 30%; NaF 1%; KHF 2 5%; PCl 3 0.5%; SnCl 2 2%; BeCl 2 1%; SiO 2 0.5%; ZnMnO 4 0.05%; composite surfactant 1%, the rest is water, of which ZnMnO 4 The function is to form hydrates with other components to promote the hot-dip plating process; the composite surfactant is a compound of alkyl sulfonate, fatty alcohol ether phosphate, and N-alkyl aminodipropionic acid. and step 2) place the treated metal material i...

Embodiment 2

[0038] Embodiment 2: A kind of highly corrosion-resistant single-plated zinc-aluminum-magnesium rare earth protective coating comprises the following steps:

[0039] 1) Decontaminate the dirt on the surface of the metal material, wash the metal material 3 times with NaOH solution and clear water at 80°C, and remove the grease on the surface of the metal material;

[0040] 2) Carry out grinding and derusting treatment on the metal material after the treatment in step 1), and the derusting level is not lower than Sa2 1 / 2 class;

[0041] 3) The single-plating flux is ZnCl 2 35%; NaF 2%; KHF 2 6.5%; PCl 3 0.75%; SnCl 2 2.5%; BeCl 2 1.2%; SiO 2 1%; ZnMnO 4 0.075%; composite surfactant 1%, the rest is water, of which ZnMnO 4 The function is to form hydrates with other components to promote the hot-dip plating process; the composite surfactant is a compound of alkyl sulfonate, fatty alcohol ether phosphate, and N-alkylaminodipropionic acid. and step 2) place the treated metal ...

Embodiment 3

[0046] Embodiment 3: A kind of highly corrosion-resistant single-plated zinc-aluminum-magnesium rare earth protective coating comprises the steps of:

[0047] 1) Decontaminate the dirt on the surface of the metal material, wash the metal material 3 times with NaOH solution and clear water at 85°C, and remove the grease on the surface of the metal material;

[0048] 2) Carry out grinding and derusting treatment on the metal material after the treatment in step 1), and the derusting level is not lower than Sa2 1 / 2 class;

[0049] 3) The single-plating flux is ZnCl 2 40%; NaF 3%; KHF 2 8%; PCl 3 1.0%; SnCl 2 3%; BeCl 2 1.5%; SiO 2 1.5%; ZnMnO 4 0.1%; composite surfactant 1%, the rest is water, of which ZnMnO 4 The function is to form hydrates with other components to promote the hot-dip plating process; the composite surfactant is a compound of alkyl sulfonate, fatty alcohol ether phosphate, and N-alkylaminodipropionic acid. and step 2) place the treated metal material i...

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Abstract

The invention discloses a highly corrosion-resistant single-coated zinc-aluminum-magnesium rare-earth protective coating and a preparation process thereof. The single-coated zinc-aluminum-magnesium rare-earth protective coating process of the present invention can utilize a single hot dipping method to obtain zinc and aluminum on the metal surface Magnesium alloy coating. The coating and the metal substrate each maintain their original performance, but have more than 99.9% of the metallurgical bonding interface. At the same time, the coating has a dense structure, stable composition, no missing plating, excellent corrosion resistance, and salt spray corrosion up to 2060h. The corrosion resistance of the alloy coating is better than that of ordinary hot-dip pure zinc coating, which improves the service life. The single-plating process can be reused and industrialized, and it overcomes the difficulties of metal and zinc-aluminum-magnesium alloy liquid electroplating. It is difficult to form an excellent bonding interface between the two, and it is easy to produce missing plating. It can be widely used in the preparation of metal surfaces. 5%-12% Al, 1%-6% Mg content of zinc-aluminum-magnesium alloy plating solution, the prepared co-permeation layer forms Zn / Al / MgZn2 ternary eutectic and various types of binary eutectic, which is eutectic The main reason for the high corrosion resistance of the seepage layer.

Description

Technical field: [0001] The invention relates to the technical field of steel material surface coating technology, in particular to a highly corrosion-resistant single-coated zinc-aluminum-magnesium rare earth protective coating and a preparation process. Background technique: [0002] The galvanized protective layer of the traditional metal substrate is affected by the deterioration of the natural environment and the electromagnetic environment of the transmission line, and the corrosion rate is accelerating, which greatly shortens its service life. In heavy corrosion environments (such as coastal areas, acid rain areas, industrial pollution areas, etc.), It has to be replaced as a whole, which greatly increases the maintenance cost and reduces the safety of the power grid. Especially in the electromagnetic field environment such as strong electric field and lightning strike, the electromagnetic effect will aggravate the corrosion of the coating. The zinc-aluminum-magnesiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/02
Inventor 郭凯李辛庚岳增武傅敏王晓明闫风洁王学刚曹建梅李晓宇
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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