Low-aluminum low-magnesium zinc-aluminum-magnesium plated steel plate and method for producing same

A coated steel plate and production method technology, applied in coating, hot-dip coating process, metal material coating process, etc., can solve the problems of increased process complexity, increased cost, and decreased corrosion resistance of the coating

Active Publication Date: 2013-10-23
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The uniform distribution of aluminum and magnesium in the patented coating also cannot give full play to the role of aluminum and magnesium in improving the corrosion resistance of the coating, and the steel plate needs to be pre-plated with nickel before hot-dip plating, which not only increases the cost,

Method used

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  • Low-aluminum low-magnesium zinc-aluminum-magnesium plated steel plate and method for producing same
  • Low-aluminum low-magnesium zinc-aluminum-magnesium plated steel plate and method for producing same
  • Low-aluminum low-magnesium zinc-aluminum-magnesium plated steel plate and method for producing same

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Embodiment Construction

[0023] The chilled steel strip is continuously annealed and hot-dip galvanized aluminum-magnesium alloy in the continuous hot-dip galvanizing line to produce low-aluminum and low-magnesium zinc-aluminum-magnesium coated steel sheets. The main process parameters are shown in Table 1, and the composition of the plating solution is shown in Table 2. See Table 3, and see Table 4 for properties of coated steel sheets. No. 1 in Table 1 corresponds to No. 1 to 6 in Table 2; No. 2 in Table 1 corresponds to No. 7 to 12 in Table 2; No. 3 in Table 1 corresponds to No. 13 to 18 in Table 2; No. 4 in Table 1 Corresponds to serial numbers 19-24 in Table 2; serial number 5 in Table 1 corresponds to serial numbers 25-30 in Table 2.

[0024] Table 1 main process parameters

[0025]

[0026] Table 2 Chemical Composition of Plating Solution

[0027] serial number

Al，％

Mg, %

Al / Mg

Ti,%

RE,%

1

1.0

1.0

1.0

2

1.2

...

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Abstract

The invention provides a low-aluminum (Al) low-magnesium (Mg) zinc (Zn)-aluminum-magnesium plated steel plate and a method for producing the low-Al low-Mg Zn-Al-Mg plated steel plate. After a steel plate is annealed in nitrogen (N2) containing 0.5-30vol% of hydrogen (H2), the steel plate is impregnated with a plating solution, wherein the temperature of the plating solution is 40-120 DEG C above zero (the melting point of a zinc alloy); before the steel plate is impregnated with the plating solution, the temperature of the plating solution ranges from impregnating temperature to impregnating temperature + 50 DEG C above zero; the steel plate is impregnated with the plating solution for 2-10 seconds, and the steel plate is cooled at the speed of 10-50 DEG C per second after being impregnated with the plating solution; the plating solution comprises the following chemical components: 1.0-2.4% of Al and 1.0-2.0% of Mg, wherein the ratio of the Al to the Mg is more than or equal to 1; the plating comprises the following chemical components: 1.0-2.4% of Al and 1.0-2.0% of Mg, wherein the ratio of the Al to the Mg is more than or equal to 1, and Fe is less than or equal to 1%; the plating is formed by a Zn-rich phase, an Al-rich phase, MgZn2 and eutectic structures thereof; the thickness of an Fe-Al intermetallic compound between the plating and the steel-based interface is not more than 0.5mu m; and the content of Mg in the surface of the plating of every 1mu m is not less than 2%. The Zn-Al-Mg plated steel plate provided by the invention has good corrosion resistance, toughness and weldability, and the process for preparing the Zn-Al-Mg plated steel plate is simple and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanizing, and in particular relates to a production method of a low-aluminum and low-magnesium zinc-aluminum-magnesium coated steel sheet and the coated steel sheet. Background technique [0002] In the field of hot-dip galvanizing, in order to improve the corrosion resistance of galvanized steel, zinc 5% aluminum 0.06% rare earth alloy coated steel (trade name Galfan), zinc 55% aluminum 1.6% silicon alloy coated steel (trade name Galvalume), but the zinc 5% aluminum 0.06% rare earth alloy only improves the corrosion resistance by 2 to 3 times. Although the zinc 55% aluminum 1.6% silicon significantly improves the corrosion resistance, it loses the cathodic protection performance of zinc. ZL00811491.9, ZL01804732.7, CN101812653A, CN101812654A, US6235410B1, TW201114946A, ZL200310119444.9 and other zinc alloy coated steel sheets containing aluminum and magnesium with good comprehensive performance, not onl...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/40C22C18/04
Inventor 李锋吕家舜杨洪刚
Owner ANGANG STEEL CO LTD
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