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A hot-dip galvanizing method for obtaining colored coating on flat steel

A hot-dip galvanizing and coating technology, which is applied in the direction of metal material coating process, coating, hot-dip coating process, etc., can solve the problems of narrow process window range, easy to appear variegated, narrow process window, etc.

Active Publication Date: 2020-09-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although predecessors have already carried out experimental research on color hot-dip galvanizing technology, it is still in the initial stage of experimentation, and many technical problems have not been resolved: the range of process windows for various colors is narrow, the color of the coating is not easy to control, and the types of coating colors obtained are relatively large. Among them, the color process window of grass green and sandstone color is extremely narrow, and the uniformity of the obtained grass green and sandstone color coating is low, and it is easy to appear variegated colors, mostly presenting various mixed colors such as red green, yellow green, purple green, etc.

Method used

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  • A hot-dip galvanizing method for obtaining colored coating on flat steel
  • A hot-dip galvanizing method for obtaining colored coating on flat steel
  • A hot-dip galvanizing method for obtaining colored coating on flat steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] The color hot-dip galvanizing process is carried out on the cold-rolled steel plate with a thickness of 0.1mm. The size of the steel plate is 50mm×40mm×0.1mm. First, a special colored hot-dip galvanizing bath is prepared, and the surface of the plated parts is pretreated, and finally hot-dip galvanized Operation, the specific operation steps are as follows:

[0168] Step 1, prepare the plating solution

[0169] (1) After melting the zinc ingot, add the pre-prepared master alloy;

[0170] (2) Make the ratio of elements in the zinc solution satisfy Zn content of 98.75%, Mn content of 1%, Y content of 0.1%, Ce content of 0.08%, Cu content of 0.05%, and the balance is impurities.

[0171] Step 2, surface pretreatment of plated parts

[0172] (1) Soak the plated piece in 4wt.% NaOH solution at 70°C for 20 minutes to carry out alkali cleaning and degreasing, take it out after soaking, and clean it with clear water;

[0173] (2) Soak the plated piece in 15wt.% hydrochloric ...

Embodiment 2

[0205] The color hot-dip galvanizing process is carried out on a steel plate with a thickness of 5mm. The size of the steel plate is 50mm×40mm×5mm. First, a special color hot-dip galvanizing bath is prepared, and the surface of the plated part is pretreated, and finally the hot-dip galvanizing operation is performed. The specific operation Proceed as follows:

[0206] Step 1, prepare the plating solution

[0207] (1) After melting the zinc ingot, add the pre-prepared master alloy;

[0208] (2) Make the ratio of elements in the zinc solution meet the Zn content of 99.3%, the Mn content of 0.6%, the Y content of 0%, the Ce content of 0%, and the Cu content of 0.03%. The balance is impurities.

[0209] Step 2, surface pretreatment of plated parts

[0210] (1) Soak the plated parts in 5wt.% NaOH solution at 60°C for 25 minutes to carry out alkali cleaning and degreasing, take out after soaking, and clean with water;

[0211] (2) Soak the plated piece in 18wt.% hydrochloric aci...

Embodiment 3

[0234] The color hot-dip galvanizing process is carried out on a steel plate with a thickness of 10mm. The size of the steel plate is 70mm×50mm×10mm. First, a special color hot-dip galvanizing bath is prepared, and the surface of the plated part is pretreated, and finally the hot-dip galvanizing operation is performed. The specific operation Proceed as follows:

[0235] Step 1, prepare the plating solution

[0236] (1) After melting the zinc ingot, add the pre-prepared master alloy,

[0237] (2) Make the ratio of elements in the zinc solution meet the Zn content of 99.5%, the Mn content of 0.4%, the Y content of 0.05%, the Ce content of 0%, and the Cu content of 0.05%. The balance is impurities.

[0238] Step 2, surface pretreatment of plated parts

[0239] (1) Soak the plated parts in 6wt.% NaOH solution at 50°C for 35 minutes to carry out alkaline cleaning and degreasing, take out after soaking, and clean with water

[0240] (2) Soak the plated parts in 20wt.% hydrochlor...

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Abstract

The present invention is a hot-dip galvanizing method for obtaining colored coatings on flat steel materials. The steps are: preparing a special element ratio alloy plating bath, and placing the surface-pretreated flat steel materials into the hot-dip galvanizing bath at a rate of 0.01 to 0.03m / s. Medium, dip plating at 430~560°C for 0.5~10 minutes, take it out from the zinc liquid at the same rate, and stop air and water cooling to obtain a colored coating with uniform and single color, good surface finish, and no variegation. This method is divided into flat thin steel and thick steel according to the thickness of the steel. It fully analyzes the structural characteristics of the steel, controls the immersion and leaching rate, immersion plating temperature and other process parameters, and performs color hot plating on flat steel with different thicknesses and widths to obtain uniform coating thickness. The corrosion resistance and weather resistance of the coating are stronger than those of color coating technology, the adhesion and wear resistance of the coating are stronger than those of color passivation technology, and the color uniformity is much higher than that of the color coating of the original color hot-dip galvanizing technology. The process is simple, easy to control, strong in craftsmanship, low in cost, and has broad industrial promotion prospects.

Description

Technical field: [0001] The invention belongs to the technical field of material surface treatment, and in particular relates to a hot-dip galvanizing method for obtaining colored coatings on flat steel materials. Background technique: [0002] Hot-dip galvanizing is the most widely used and most economical and effective steel anticorrosion measure in the world. It involves many industries such as electric power construction, transportation, home appliances and furniture. Due to the diversity of its application fields, the corrosion resistance and weather resistance of the galvanized layer and its good decorative properties are the focus of people's attention and research. [0003] Existing steel plate coloring technologies mainly include color paint coating, color passivation technology, etc., and color coating technology is the most widely used industrially for steel plate coloring technology. For some steel products with various specifications, color passivation technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C22C18/00C22C1/03C23C2/02C23C2/40
CPCC22C1/03C22C18/00C23C2/02C23C2/06C23C2/40
Inventor 乐启炽胡成路赵大志廖启宇程春龙李小强郭瑞臻
Owner NORTHEASTERN UNIV LIAONING
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