Hot-dip galvanizing method for obtaining colored plating on flat steel

A hot-dip galvanizing and coating technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve the problems of easy occurrence of variegation, narrow process window range, and difficult control of coating color.

Active Publication Date: 2019-10-11
NORTHEASTERN UNIV
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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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  • Hot-dip galvanizing method for obtaining colored plating on flat steel
  • Hot-dip galvanizing method for obtaining colored plating on flat steel
  • Hot-dip galvanizing method for obtaining colored plating 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 invention discloses a hot-dip galvanizing method for obtaining colored plating on flat steel. The method comprises the following steps of preparing alloy plating solution with special element proportion, placing the flat steel subjected to the surface pre-treatment in the hot plating solution at the rate of 0.01 m/s-0.03 m/s, carrying out immersion plating at the temperature of 430-560 DEG C for 0.5 min-10 min, taking out the flat steel from zinc liquid at the same rate, and carrying out air cooling and water cooling so as to obtain the colored coating which is uniform and single in color,good in surface smoothness and free of mixed color. According to the method, the steel can be divided into thin flat steel and thick flat steel according to the thickness of the steel, characteristics of a steel structure are fully analyzed, and technological parameters such as the immersion and leaching rate and the immersion plating temperature are regulated and controlled; the colored platingobtained through the colored hot-dip galvanizing carried out on the flat steep with different thickness and width is uniform in thickness, is stronger than that obtained through colored coating technology in terms of corrosion resistance and weather resistance, is stronger than that obtained through colored passivation technology in terms of adhesion and wear resistance, and is far higher than that obtained through original colored hot-dip galvanizing technology in terms of color uniformity; and the method is simple in process, easy to control, high in manufacturability, low in cost and wide in industrial popularization prospect.

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 Applications(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
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