TWI308184B - - Google Patents

Description

1308184 IX. Description of invention:

[Technical Field of the Invention] The present invention relates to a hot dip plating method of a key alloy steel sheet excellent in silver resistance and workability. [Prior Art] Since the corrosion resistance and heat resistance of the aluminum alloy plated steel sheet are superior to those of the galvanized steel sheet, it is mostly used in automobile mufflers, home electric appliances, and heat resistant materials. For example, Sakamoto Kaikai No. 57-47861 discloses that an aluminized steel sheet contains iron and titanium, etc. 'Japanese Unexamined No. 63-184043 discloses that the mining sheet contains iron, carbon, dream, copper, nickel and a small amount of chromium; Zha 60_243258 discloses that the ore-aluminum steel plate contains 0.01 to 4.0% of manganese, 1⁄15% of titanium, 〇〇1 to 15%, and 矽3 to 15%. - The mine mineral steel plate is heated in a non-oxidizing environment or a weak oxidizing environment, first heated, cold rolled, to remove the grease stain attached to the surface, and then heated in a reducing environment and impregnated with her fire_fire In addition to the method of doping the mixed surface, the growth of the iron-and-melting alloy layer is inhibited by the reaction of the domain iron, or

It can be added to suppress the growth of the alloy layer (4), which will damage the surface of the steel sheet and is mostly applied to the heat-resistant parts of automobile silencers. View, creating an unclear appearance problem. 1308184

The parts used in the exhaust of the car are still developing a steel plate containing chromium. For example, the plated bath steel plate containing chromium 1.8 to 3.0% in the special opening of Japan No. 63_18〇43 or the chromium plate 2 in the special opening No. 83474456 3% of steel plates, etc. SUMMARY OF THE INVENTION The present invention relates to a hot dip coating method for a plated aluminum alloy steel sheet, which provides a method of adding chromium and magnesium to a plating bath containing bismuth to suppress the growth of an alloy layer which impairs workability and surface appearance. The hot dip key method of the key alloy steel plate which is resistant to the surname and heat resistance. Therefore, the object of the present invention is to provide a hot-green green coated aluminum alloy which is excellent in both workability and resistance to the button, and to increase the age of the gold, so as to accelerate the formation of the age, and to have the outer body, the record and the _ sex. Extremely Good 0 In order to achieve the above object, the present invention is characterized in that hot dip plating is performed in a bath bath having a weight of 5 to 15 parts by weight, a weight of G.1 to 〇, and a weight of magnesium to 3.3. [Embodiment] Hereinafter, the present invention will be described in more detail. In the aspect of the invention, the miscellaneous tank contains 5 to 15 parts by weight. At the same time as the growth effect of the alloy layer of Shishi, it also has the effect of improving the fluidity of the mineral bath and obtaining the effect of the gloss. The amount of addition exceeds the ^ _ __ plate-like fine phase, and the workability of _ is deteriorated. Therefore, the amount of (4) added is preferably 5 to 15 parts by weight. 1308184

The chrome 'Fengshi dip-bell layer added to the plating bath is known to form a fine non-dynamic oxide film, and the key name of the steel plate is improved, and the 7G element in the mineral bath sample is evenly distributed, thereby generating The effect of refining the crystal grains of the alloy layer. Further, the band form formed in the leaching layer has a function of improving workability and corrosion resistance of the fracture surface after processing. If the chromium content is 0.1 part by weight or less, the effect of uniform distribution in the plating bath is reduced. If the weight exceeds the L5 weight, the temperature of the plating bath must be increased with the increase of the chromium content. If the temperature of the bath is increased, the float will increase. The scum of the increase will adhere to the surface damage of the aluminum-plated steel sheet. Therefore, the amount of chromium added is preferably 〇·; [~1.5 parts by weight. The addition of magnesium causes the oxygen of the touched wire to combine to form a non-dynamic film. This prevents oxygen from diffusing into the interior of the alloy layer, prevents additional corrosion, and improves heat resistance. Magnesium also has the effect of reacting with aluminum to block oxygen diffusion, and can significantly improve the resistance to the surname of the cut section after processing. If the addition amount of the town is _weight, the effect of the dispersion is reduced. When the amount exceeds 3.0 parts, the plating bath is saturated, the county point is increased, and the amount of scum generation is increased. Therefore, the amount of magnesium added is preferably 〇.〇1~3 〇 by weight. The present invention is based on the simultaneous addition of chromium and magnesium in a plating bath containing 5 to 15 parts of the weight of the miscellaneous tree, which will provide many opportunities for nucleation, thereby making the zinc flower 1308184 96. 3. 19 fine (spangle) Chemical. Year/Month/___Supplement means that the added components are dispersed in the immersion bath after being treated by the hot mineral bath in the metal solution, and the amount is high. Therefore, in the process of solidifying the material, the crystal grain boundary Mutual interference occurs to control the growth of crystal grains. Therefore, the appearance of the surface can be exaggerated, the graininess of the granules can be enhanced, and the growth of the _ and _ alloy layers can be enhanced, and the immersion coating layer having excellent workability can be formed. On the one hand, when it is placed in a bath solution, it is preferable to set the temperature of the material steel sheet to (10) to 700. (:, metal miscellaneous temperature is set to 620 to 68 (rc.) If the human groove temperature of the material steel plate is (10) t or less, the appearance of the immersion film is poor, and the coating film adhesion is lowered, and if it is c or more, The thermal diffusion of the material steel plate causes the alloy layer to grow abnormally, which not only has poor workability, but also causes excessive oxide layer formation in the molten metal. The amount of leaching deposit is based on one side, preferably 2G~pass 2, if the amount of adhesion is less than the following, the control of the amount of air (four) force 増: more than will cause the deviation of the immersion plating I in the paste, the metal melt will increase due to the rapid increase in surface oxide When the film thickness is 3 〇〇g/m2 or more, the alloy layer is excessively formed, and the workability is remarkably lowered. However, the present invention is not limited to the following embodiments to more specifically explain the present invention. Example of 1308184 Steel plate thickness 0.8mm, width 3d〇mm^^iiL in the test type without oxidation, as shown in Table i, the composition of the bath is changed, (4) _ alloy steel plate. The amount of leaching is the job Jingjing, and manufactured alloy steel The results of the evaluation are shown in Table 1. In Table 1, 'the Xiesheng and the processing are used as the evaluation items, and the rice resistance is based on the KSD9504 test method, with 5%, 35% NaC1 in the salt water spray test atmosphere. In the case of the initial rust generation time (5%), the comparison is made. The processability is based on the KSD0006 method. After the 180 COT bending test, the stereo microscope is observed at a magnification of 30 to 50. The width of the crack (the width of the fracture surface) is generated, and the width dimension of the fracture surface is measured, thereby comparing and evaluating. 1308184 [Table 1]

Composition of the plating bath (weight portion) Classification 矽 (Si) Chromium (Cr) Magnesium (Mg) Single-sided adhesion (g/m2) Invention Example

5.0 0.1 0.01 10.0 12.0 5.0 12.0 5.0 10.0 15.0 10.0 12.0 5.0 5.0 10.0 12.0 0.3 0.5 1.0 1.5 1.5 1.2 0.7 0.9 0.5 1.0 0.01 0.01 0.001 0.01 0.01 0.5 0.01 0.01 1.0 0.1 2.0 3.0 1.0 0.005 0.007 0.003 Processability (void surface width) Ιιη) Flat Part (hr) Cut "Parts Record 40

Β,,Ι Ιϋ·ϋ I - 1 - 1 45 I 30-45 1200 ~~~ As shown in Table 1, the examples of the present invention are excellent in processability and corrosion resistance. That is, the invention example was that the crack (fracture surface) generated by the 180 〇C〇T bending test was about 10 to 15 μm, which was superior to the comparative example. In terms of resistance to the surname, the case of the inventive example showed that the flat portion was rusted for about 3 hours, the shear portion was cast for 1,000 hours, and the comparative example was about 12 hours for the small amount of milk, and the invention was invented. The examples are exceptionally good. As a result of visual observation, it was better to compare the surface appearance of the inventive examples with the comparative example, which is a result of miniaturization of the zinc flower size. As described above, according to the present invention, a small amount of chromium and magnesium are added to the aluminum shovel tank containing 5 to 15 parts by weight, which can control the nucleation between the grain boundaries, thereby improving the surface appearance and resistance. Sexual and processable money aluminum alloy steel sheet. 10 1308184 fiXis r " _ \ m3 Due to the excellent processability, the immersion clocks and the immersion skin cracks that occur during the forming process are reduced, and the excellent durability is also obtained after processing. By using a steel sheet having such a feature, it is possible to manufacture an automobile muffler and a heat-resistant home electric appliance having more excellent durability. [Simple description of the diagram] [Description of main component symbols]

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Claims (1)

1308184 X. Patent application scope: 1. A hot dip coating method for aluminum alloy plated steel plate, which is preheated to 650-700 °C as a good material steel plate 'immersed in a plating bath composed of aluminum, tantalum, chromium and magnesium. The internal temperature is preferably 620-680 ° C; wherein the added stone is 5 to 15 parts by weight, 0.1 to 1.5 parts by weight of chromium, and 0.01 to 3.0 parts by weight of magnesium. 2. The hot dip coating method of the mineral alloy steel plate according to item 1 of the patent application scope, wherein the material steel plate preheated to 650-70 CTC is immersed in 62 〇 _68 〇. (: The plating bath, the amount of immersion plating is preferably 20 to 300 g/m2 on one side. 12