TW200404916A - Composition for controlling spangle size, a coated steel product, and a coating method - Google Patents

Abstract

A method of coating of steel products such as plate and sheet using an aluminum-zinc coating alloy includes modifying the coating bath with a particulate compound constituent in effective amounts to control the spangle facet size of the coated product, improve tension bend rust stain performance, improve coated surface appearance when brushed, and coated product paintability. Constituents includes borides such as titanium boride and aluminum borides, carbides such as titanium carbide, and aluminides such as titanium aluminide. The method produces a coated steel product that does not require temper rolling for painting.

Description

200404916 说明 Description of the invention (The description of the invention shall state: the technical field to which the invention belongs, the prior art, the content, the embodiments, and a brief description of the drawings) This case is the application number 09 / 978,794 (which It is part of the continuation application of application serial number 09 / 414,766, which was filed on October 7, 1999 but has been abandoned. [Technical Fields of Inventive Households 3 5 Fields of Invention

The invention relates to a coating composition, a coated steel product, and a manufacturing method, and in particular, to a Ming-zinc coating composition, which uses an effective amount of a particulate compound component for coating. Promote the tensile bending rust spot performance and appearance of the sheet and reduce the size of zinc cross section when painting. 10 [Prior Art] Background of the Invention Coating steel components (commonly referred to as hot dip coating) with a coating alloy mainly composed of aluminum is known in the art. A special type of coating is under the trade name Galvalume®, which is owned by BIEC International, Inc. 15 and is a representative of aluminum-zinc coated alloys.

These materials can be advantageously used as building materials, especially walls and roof structures, due to their corrosion resistance, durability, heat reflection and paintability. These materials are typically manufactured by passing a steel product such as a sheet or plate through a bath of a molten alloy coating composition containing aluminum, zinc, and silicon. The content of the coating applied to the steel 20 product is controlled by wiping, and then the product is cooled. One of the characteristics of the coating applied to steel is its particle size or zinc cross-section size. U.S. Pat. Nos. 3,343,930 (Borzillo et al.), 5,049,202 (Willis et al.), And 5,789,089 (Maki et al.) Disclose that manufacturing to These 0 continuation pages (note that the pages of the invention are not enough, please note and use the continuation page) 200404916 Invention Description 发明, the method and technology of aluminum-zinc alloy coated steel sheet. All three references are incorporated herein for reference. European Patent Application No. 0 905270 A2 (Komatsu et al.) Discloses another coating method using zinc, aluminum and magnesium. This application concerns the resolution of corrosion problems related to baths containing magnesium as an alloying element. Furthermore, it is revealed that unwanted band patterns occurring in magnesium-containing baths do not occur in magnesium-free baths. US Patent No. 5,571,566 (Cho) discloses another coating made of aluminum_zinc_silicon alloy. Method of covering steel sheet. The purpose of the Cho patent is to provide 10 more efficient manufacturing methods for coated steel sheets. Cho is to make the size of the zinc flower uniform by incorporating a large number of zinc flower particles into the coating (which limits the subsequent growth of the zinc flower because these particles interfere with their individual growth and cause a smaller zinc flower section size). Minimal and serves this purpose. This seeding effect is achieved by using titanium as part of the melt coating composition. 15 The similarity with regard to the use of titanium in the coating bath to minimize the size of the zinc flower section is not disclosed in the article entitled, "Adding titanium to the coating bath to minimize the size of the zinc flower section" ( Ch〇, published at the 1994 Canadian INTERZAC 94 conference.) In this article, the author points out that elements such as chains, boron, and chromium produce finer zinc flowers in Galvalume coatings. 20 This disclosure is related to the Cho patent case. The disclosed content is consistent. Although the improvements suggested by Cho, the coated steel products used today still have disadvantages. One disadvantage is that when the coated steel products are painted, #the tempering and drying are required to make the products prepared. Flattened for painting. Another problem is that the product is a sheet and it is broken by the 4th curve. When this sheet product is bent, the coating will break. (Please note and make dirty pages) 200404916 玖, description of the invention Description of the continuation sheet cracking, cracking exposes the steel to the environment and prematurely corrodes. By now available, coated steel sheets, a large number of cracks will form, As a result, the endurance of the sheet product to the gamma rot name is endangered. Due to the lack of know-how, there has been a need to provide 5 aluminum-zinc-coated steel products with improved bending properties, reduced zinc cross-section size, and improved top coat surface appearance. The present invention is This demand is addressed by providing a method for coating steel products, a coating composition, and a coated steel object, which still have a wealthy name when encountering surface cracks during the front and the bend. The coated steel is not required to be tempered and rolled when it is painted. The coating composition is modified by one or more particulate compound components (such as titanium oxide, rotten inscription, etc.). In addition, it is related to consumption Discussions have led to an understanding of the long-term need to develop an application that provides for architectural applications (eg, indoor functional / decorative applications such as metal shields at the bottom of doors, counter back splashes, cabinets, homes,倶) high cost aluminum, stainless steel and other similar metal materials with less expensive metal appearance. The invention can be used to paint a 55% A1 and Zri alloy coated steel object (which provides a Stucco stainless The appearance of the painted object or the painted aluminum object) to address this need. Prior to the present invention, the appearance of this painted metal could not be obtained in 55% a1 and Zn alloy coated 20 steel sheet products. [Summary of the Invention] Summary of the Invention Therefore The first object of the present invention is to provide an improved hot-dip coating composition for steel products. 0 Continued pages (When the description page of the invention is insufficient, please note and use the continued page) 200404916 说明 Description of the invention Another object is a method for coating steel products using an improved aluminum-zinc-coated alloy. Another object of the present invention is to provide a coated steel product with improved tensile bending rust spot performance and painted appearance. Another object of the invention is a coated steel article using an improved coated alloy composition. Another object of the present invention is a method for coating and subsequent painting of steel products, whereby the coated steel products need not be tempered and rolled before being painted. ίο 15

Another object of the present invention is to provide a whitewashed Al-Zn alloy coating which has an improved visual appearance compared to a whitewashed conventional Galvalume coating. Another object of the present invention is to provide a painted Al-Zn alloy coated product having an improved visual appearance that can provide additional material application to more expensive painted aluminum or painted stainless steel materials. . Other objects and advantages of the present invention will become apparent as the description proceeds.

In order to meet the foregoing objectives and advantages, the present invention is an improvement of the hot dip coating technology of steel products using aluminum-zinc coated alloys. The composition of Ming-Zinc alloy is composed by adding an effective amount of one or more side compounds selected from titanium and titanium, aluminum compounds containing titanium 20 and iron, and carbon compounds containing titanium, vanadium, tungsten and iron. The components of the particulate compounds of the Zigzag group are modified. Preferably, this component is one of TiC, TiB2, A1B2, A1B12, and TiAl3. This component can be prepared in various ways as part of the improvement step, for example, as a precursor containing mainly aluminum or as a part of the main alloy ingot or bath. 0 Continued pages (when the invention description page is insufficient, please Note and use the continuation sheet) 〇〇〇〇〇 04１６ 6, the description of the invention Description of the continuation sheet injury, then, the main alloy is added to the aluminum_zinc bath in the required ratio to achieve suitable coating and coating due to the modifier component. A final bath composition that provides the benefits of the present invention. This component can be added to the master alloy as a particulate compound, or it can be formed in situ within the master alloy added to the actual coating bath. 5 More specifically, the composition of the coating bath can be modified by: (1) directly adding particles (powder) to the coating bath or a pre-melt pot supplied to the coating bath; (2) adding The ingot of the required granules; this ingot can be granular aluminum, granular zinc, granular zinc-aluminum alloy, etc .; this ingot can be added to the main coating pot or pre-melt pot; The melting bath of the required particles, where the 10 liquid can be aluminum with particles, zinc with particles, zinc-aluminum alloy with particles, etc. (4) react in situ in the main pot or pre-melt pot For example, particles are generated by reaction of elemental species, such as titanium and boron in the aluminum feed melt, or salts on the melt feed. The particle size of the components in the coating bath can vary, but a preferred range is about 15 0.01 to 25 microns. When implementing the present invention, the zinc cross-section size range of the coated product is as low as (K0mm and up to 20mm.) The effective amount of this component is considered to reduce the zinc break of the coated product. The face size increases the number of cracks while maintaining a smaller crack size than traditional aluminum-zinc coated products, and the amount of temper rolling is not required when painting. This component is mainly based on alloy bath 20 (boron, carbonization) Material or aluminide) is considered to be in the range of about 0.005 to 3.5% of the total weight. When this component is a butterfly, the preferred weight of this component as part of the coating bath The percentage range may be between about 0.001 and 05%. When this component is a carbide, a preferred weight percentage range may be between about 0.005 and 0.001❶ / 〇. 0 Continued pages When you face, remember the face and face) 玖, Description of the invention Description of the leaflet The present invention also provides a coated steel object using a coating containing a particulate compound component, and a coating applied to the steel Composition. This product is preferably a steel sheet or plate used for structural purposes. Reference is now made to the drawings of the present invention, where: Figure 1 is a comparison of the use of titanium boride and titanium as the melting additive for hot dip coating in terms of the size of the zinc cross section and the titanium content. In terms of the size of the zinc flower section and the content of the butterfly, a comparison is made using decayed titanium and aluminum alloy as the hot dip coating melt additive. Figure 3 compares the use of carbonization with the size of the zinc flower section and carbon content Titanium as a hot-dip coating melt additive. Figure 4 shows a comparison of the bending test results of coating compositions modified with titanium and titanium boride. Figure 5 shows a comparison of coatings containing titanium carbide. Mapping of rupture area and rupture number of coating composition and traditional coated steel products. Figures 6a-6c are photomicrographs showing the size of the zinc cross section of traditional coated products and products modified with TiB2. Figures 7a-7c are photomicrographs showing the cross-section dimensions of the zinc flower of traditional coated products with and without titanium. Figures 8a-8c are the traditional coated products and modified TiC Photomicrograph of zinc cross-section dimensions of the product. Figures 9a-9c show the traditional coating Micrographs of the zinc flower cross-section dimensions of the products and products modified with A1B2-A1B12. L Embodiment 30 0 Continued page (when the description page of the invention is insufficient, please note and use the continued page) 10 ^ 200404916 Invention Description fSale page, description of the preferred embodiment of the invention description

The present invention advances the technique of hot dipping or coating steel products (especially plate and sheet products) using an aluminum-zinc molten alloy bath (eg, a Galvalume bath). According to the present invention, the coating bath is modified with particulate compound components to reduce the zinc cross-section size of the coated steel. By adding a particle component and bending rust spots under tension, the improvement can also be achieved in the performance of the coated steel. Tensile flexural rust spots are individual cosmetic red rust patterns that travel along the ribs of a pre-painted, roll-formed building board caused by metal coatings and paint rupture. ίο The surface of the coated steel also produces an appearance that is superior to that of traditional Galvalume products. This is believed to enable the production of smooth coated steel sheet products without temper rolling. Eliminating this additional processing step for quenching and rolling also reduces energy consumption, removes possible waste streams associated with quenching and rolling, and simplifies manufacturing methods.

In its broadest embodiment, the present invention requires a novel composition for a steel coating, a method for manufacturing the coating, and an article made therefrom. When the steel product is coated with an aluminum-zinc coating bath, the processing steps for forming the bath to a desired composition and passing the steel product to be coated through the bath are known. Therefore, further descriptions of conventional techniques and devices for performing this conventional coating are not considered necessary for an understanding of the present invention. The inscription of the know-how-the composition of the zinc alloy bath is known in the patent case of Borzillo et al. And Cho, and in the published literature of Cho as shown above. Typically, this bath contains about 55% aluminum, a content of silicon (typically about 1.6% by weight), and the rest of zinc. Other changes to this composition are due to familiarity with this technique. 0 Continued pages (When the description page of the invention is not enough, please note and use the continued page) 11 200404916 玖, description of the invention, description of the invention, continued _ Traditionally known by the artist It is within the scope of this method. According to the present invention, the aluminum-zinc molten bath is modified with particulate compound components to achieve improvements in reducing the size of zinc flower sections, improving surface processing, reducing cracking, size, and possible improvements in tension bending rust spots. . The granulated pentoxide component may be a boride, carbide or aluminide. Preferably, the boride compound includes titanium boride (TiB2) and aluminum boride (A1B2 and A1B12). The particulate compound component based on the carbide may be titanium carbide, vanadium carbide, tungsten carbide, and iron carbide, and the aluminide may be titanium alumina (TiAl3) and iron aluminide. The content of the particulate compound Φ component is determined to effectively reduce the size of the zinc flower section to an amount superior to that of conventional coatings (with or without elemental titanium). Although this effective amount may vary depending on the selected compound, it is expected that the content range is from about 0.0005 wt% to about 3.5 wt% of carbon, boron or aluminide of the composition of the coating bath. For carbon, a more preferred range is between about 0.005 wt% and 0.10 wt% of this bath. In terms of titanium concentration, a coating melt bath containing titanium can have a bath weight of about 0.001%. And a titanium concentration between 0.1% by weight. For boride compounds, the weight percentage of boron in this bath can range from 0.001% by weight to 0.5% by weight. Table 1 shows the wide range of requirements when only a single type of particle is added. Particles are added: 2 Table 1 Coating bath composition (wt%) is generally 55% Al_1.6% Si- the remaining amount of Zn melt Weight% of internal particles Ti B c _TiB2 0.002-1.0 0.001-0.5-0.007-3.5 _aib2 1-0.001-0.5-0.010-5.0 -_Aib12-0.001-0.5-0.005-2.5 _TiC 0.0019-1.9- 0.0005-0.5 0.0025-2.5 0 Continued pages (When the invention description page is not enough, please note and use the continuation page) 玖. Turn the description page of the invention description. For example, for 100 grams of molten material, the amount of TiB2 particles needs to be 0.007. _3.5 grams. The values in Table 1 assume a stoichiometric addition. Excessive Ti (in the case of Tic or TiB2) is allowed but not required. Table 2 shows the preferred or optimal range for particle addition: _ Table 2 The particle type coating is generally 55 ° / bath composition (wt%) 4Al-1.6% Si- balance of the particles in the Zn melt % By weight Ti BC TiB2 0.01-0.05 0.002-0.1-0.014-0.7 AIB2-0.02-0.05-0.2-0.5 A1B12-0.02-0.05-0.2-0.5 TiC 0.011-0.38-0.003-0.1 「0.015- The particle size range of the 0.5 particle component needs to be between about 0.01 and about 25 microns. By coating the steel product using the method of the present invention, the zinc cross-section size is generated, and its range is as low as 0.05 and as high as 2.0 mm. The molten bath containing the modified aluminum-zinc alloy used to coat the steel can be made in several ways. In one method, the main alloy of aluminum is made and modified with particulate compound components The bath is then added to an aluminum-zinc coating bath, and the ratio of the two baths is calculated to achieve the target bath composition containing an effective amount of the particulate compound component. The modified alloy bath is suitable for this type of coating The bath system still follows the traditional weight percentages of aluminum, zinc, and silicon, for example, about 55% aluminum, 1-2% silicon, and the rest The amount of zinc, because the effective amount of the particulate compound is relatively low by weight percentage for the overall bath content. The method of making the master alloy is taught in US Patent Nos. 5,415,708 (Young et al.) And 3,785,807, all of which are incorporated herein For reference. Secondly, the master alloy containing particles can be added to the coated sheet in the form of a solid ingot. (When the description sheet is not enough, please note and use the next sheet.) 200404916 发明, the description sheet. This ingot It can be mainly A1, mainly Zη, or alloys containing Zη, A1, and / or Si, and fine zinc flower particles. In addition, the particulate compound component can be directly added to the aluminum-zinc bath before coating steel products. When aluminum boride is used as a bath modifier, boron particles can be added to the aluminum master alloy to promote the incorporation of the particles into the melt and improve the uniform distribution of the particles throughout the melt. In addition, the aluminum boride particles can be added in an appropriate amount. To the aluminum-zinc bath. Ίο When manufacturing an aluminum master alloy with particulate compound components such as titanium boride, some excess titanium may be present in the bath. This excess range is relative to the total boron added 0.01% to 10%. In terms of stoichiometry, an excess of titanium added to 2 mol of 1 mol titanium can range from 0.002 to 4.5 mol of excess mol. Titanium excess is not considered (regardless of the use of boronization The presence of titanium or another titanium-containing compound (such as titanium carbide, etc.) is necessary to obtain the zinc fines related to the present invention. 15

In preparing the alloy bath for coating, the particulate compound component can be introduced into the powder or formed in the bath itself. For example, titanium boride powder may be added to the bath in an appropriate weight percentage. In addition, elemental titanium and boron can be added to the melt, and heated at a sufficiently high temperature to form titanium boride particles therein. Preferably, compound particles are added to the master alloy because this treatment is more efficient in terms of energy consumption. Similar processing techniques can be used for carbides and aluminides. It is believed that the presence of titanium and boron alone in the bath will not produce the particle refining benefits demonstrated above, compared to the addition of compound particles (such as titanium boride). It has been reported in aluminum casting that when added at temperatures below 1000 ° C (1832 ° F), the individual addition of titanium and boron to the aluminum melt did not produce titanium boride particles. Substitute 0 Continued pages (Please note and use the continuation page when the description page of the invention is not enough.) 14 20 200404916 玖, description of the invention Turn over page continued. Titanium reacts with aluminum to form TiAl3 particles. Because the coating method is generally performed at a lower temperature (i.e., 593 ° C (100 ° F)), adding titanium and boron in elemental form to the A1_Z coating bath produces similar behavior. In addition, the kinetics of titanium and boron dissolution are very slow at low temperatures associated with the coating method. Therefore, when titanium boride is formed in the body of the bath, it needs to exceed the traditional melting parameters to achieve the necessary particles for the present invention. The coating method of the present invention results in a coated article in which the coating has a coating composition containing an additive particulate compound component as described above. The coated product can then be painted as is known in the art, without the need for temper rolling or skin pass rolling. Although titanium and titanium alloys and titanium alloys have been exemplified as fine zinc fines, other broken compounds (such as broken hunger, broken tungsten, iron carbide) and aluminum compounds (such as iron aluminide) have also been exemplified. It is considered to be within the scope of the present invention.

To demonstrate the unpredictable benefits associated with the present invention, the study used aluminum 15 titanium master alloys and aluminum titanium boron compound master alloys to compare coated steel products. These master alloys are added to an aluminum-zinc coating alloy to form a coating bath for the steel material to be tested. Figure 1 compares the two curves, which are dominated by the main alloy, as shown above. These curves are the relationship between the size of the zinc flower section and the titanium content in the melt as a percentage by weight. It is apparent from Fig. 1 that the use of a master alloy with titanium boride 20 significantly refines the size of the zinc flower section, especially at a lower additional content of titanium. For example, compared with the zinc cross section size of 1.4 mm when titanium is used alone, the reported zinc cross section size is about 0.3 mm at a titanium content of 0.02% by weight. Therefore, not only does the boride modifier reduce the size of the zinc flower section, it also reduces the cost by reducing the required titanium content. 0 Continued pages (note that the invention description page is not enough, please note and use the continuation page) 15 200404916 玖, the description of the invention turned over the continuation page The second picture shows the main alloy containing titanium boride and the main alloy between aluminum and boron Similar comparison. Fig. 2 shows that when compared with the main alloy of aluminum and boron only, titanium boride and the refining agent achieve a relatively small cross-section size up to which content is up to about 0.003% by weight. However, when comparing Figures 1 and 2, the use of aluminum boride particles to reduce the size of the zinc flower section was more effective than that of titanium alone. Fig. 3 shows a drawing showing the behavior of the coating composition modified with titanium carbide ', which is similar to the coating modified with TiB2 in Fig. 1. In addition to minimizing the size of the zinc cross section, the use of the particles according to the present invention as a compound component also allows the coated steel to tolerate more severe bending without cracking 10. Referring now to FIG. 4, a comparison is made between products coated with a coating bath alloy composition using only titanium and those coated with 0.050 / 0% by weight titanium boride. When boron chloride was used, the 'zinc cross section size was reduced from 1.5 mm to 0.1 mm. When the coated product is subjected to the conical bending test, the coating thickness of the product is plotted against the radius when no cracking occurs. The conical bending test is generally based on the test of astm 15 D522-93a. The use of titanium boride as the particulate compound component in the coating bath reduced the unruptured radius by 23%. • Compared to conventional sheet aluminum-zinc alloy coatings, another unexpected result related to the present invention is the formation of a greater number of smaller cracks during bending. Referring to Fig. 5, it can be seen that the aluminum-zinc-coated steel 20 modified with titanium boride has a significantly higher number of cracks than the conventional zinc zinc. However, compared with the deteriorated titanium modified products, the traditional products have a significantly increased fracture area. The smaller but more evenly distributed cracks of the present invention promote crack bridging by the paint film. This bridge then promotes choking off of the product faster than the larger fractures associated with conventional zinc coatings. Therefore, the 0 continuation page coated with titanium boride (if the invention description page is not enough, please note and use the continuation page) 16 200404916 16, invention description invention description $ Selling stomach ί 15 products can show superior skills The improvement of the product's wealth rot # sex. Figure 5 is a drawing based on bending a coated sample on a 1/6 "cylindrical elbow. The fracture size is measured after bending, and the number of fractures and the size of the surface portion of 19.71 square millimeters are detected. The maximum fracture size of the product of the present invention is less than one-half (41%) of the maximum fracture size of the traditional product. This behavior is advantageous to avoid or reduce tension. Bending rust spots are beneficial, and the worst fracture size is considered to control the tension of the coating Actors of curved rust spots. Another equally important benefit of the present invention is the surface quality of the coated steel of the present invention and its improved stability to painting. Table 3 shows several traditional aluminum-zinc coated Topography results of products and products coated with titanium-boride-modified aluminum-zinc alloy. Traditional products are shown in Figure 3 as Galvalume coatings. This table shows the surface waves of the coated products of the invention Degree (Wca) is substantially lower than that of conventional Galvalume products coated and tempered and rolled. The average wave of coated and modified with titanium boride is compared with the As coating manufactured under the same conditions. Covered by General Galvalume 67% better. The minimum zinc flower Galvalume waviness of the product of the present invention is 50% better than the tempered rolled Galvalume made by large zinc flower grinding tools. The smallest zinc flower Galvalume modified with butterfly titanium does not require tempered rolling Reduced waviness, and it is ideal for high-speed coil coating applications. The appearance of the painted product is better than Galvalume of large zinc flower coated with As and coated skin.

0 Continued pages (Please note and use the continuation page when the invention description page is not enough.) 17 20 200404916 Invention description / 1 Sell; M 玖, invention description Table 3 several traditional Galvalume coatings and modified TiB2 Minimal zinc flower

Galvalume topography results coating method / line surface ID / condition Ra (/ zin) Rt (// in) Wca (// in) PC (ppi) Galvalume w / TiB2 master alloy As-coating 24.3 273.4 15.9 167 Preliminary small-scale traditional Galvalume As-coated 16.7 196.1 48.4 58.0 Galvalume As-coated 21.6 271.2 61.3 97.5 quenched and tempered 47.3 354.9 39.6 153.5 Figure 6A-9C compares the present invention with conventional techniques and is proven in Zinc flower section

5 Size reduction. Figures 6A-6C show the effect of TiB2 added in the form of Al_5% Ti-1% B master alloy. Among them, compared with the traditional Galvalume coating, significant fine crushing of the zinc flower section size is achieved. When titanium carbide and aluminum boride are used as modifiers, the similar reduction in the size of the zinc flower section is shown in Figures 8A-8C and 9A-9C. Most importantly, when comparing Figures 6A-6C and Figures 10A-7C, especially Figures 6C and 7C, the addition of titanium alone did not produce the same reduction in the size of the zinc flower section. In fact, compared to TiB2, the presence of titanium alone only minimizes the zinc cross-section size. If the addition of boride falls within a specific concentration range, the appearance of the zinc flower size in the hot-dip coating becomes non-uniform and varies within the same coil or from coil to coil. On the other hand, when the boride is added above a certain range, the zinc flower size is no longer visible to the naked eye. In addition, at a lower boride concentration content, below a certain range, it is difficult to measure and control the small addition of the hot dip bath, which increases the problem of inconsistent size of the zinc flower. 0 Continued pages (please note and use the continuation pages when the invention description page is not enough) 18〆200404916 The invention description is in some examples. The zinc flower can be seen. The ume of the product is what you want. This visible zinc flower product is widely used in a large number of structural applications, such as large jade and architectural style roofs and siding. However, consumers do not consider the size of the zinc flower to be a problem of coating quality and a reduction problem. The change in the size of the zinc flower indicates that it has an uneven appearance with the slabs on the roof or siding of the building, which will make the building owner unhappy. More uniform-induced zinc flower size can be produced by adding a small amount of TiB2 particles 胄 φ crushing agent to a hot dip coating bath. Adding to this bath a bath of boron in the form of boride particles of about 10% by weight between about 10% and about 10% can produce between about 400 and 5000 microns (using the average interception described in ASTM E112). Length method measurement) consistent zinc cross section size. Producers and consumers believe that compared to traditional zinc-aluminum-zinc-coated products where the addition of boride falls outside a specific range, these controlled zinc-size products are superior in visual appearance. 15 Therefore, the present invention has been disclosed in its preferred embodiment, which satisfies each object of the present invention as described above, and provides a novel and improved coated steel product manufacturing method and coating composition. . Of course, various changes, improvements, and changes from the teaching of the present invention can be considered by those skilled in the art without departing from the spirit and scope of the present invention. 20 The present invention is limited only by the scope of the appended patent applications. 0 Continued pages (Please note and use continuation pages when the invention description page is not enough.) 19 200404916 The last page of the description of the invention, the description of the invention [Simplified illustration of the drawing] Figure 1 is based on the size of the zinc flower section and the titanium content. The comparison uses titanium boride and titanium as a melting additive for hot dip coating. Figure 2 is a comparison of the size of the zinc flower section and the boron content using titanium boride and aluminum boride as hot-dip coating melt additives.

Fig. 3 is a graph comparing the use of titanium carbide as a hot-dip coating melt additive in terms of the size of the zinc profile and the carbon content. Figure 4 is a graph showing a comparison of the bending test results of a coating composition modified with titanium and titanium boride. Fig. 5 is a graph comparing the cracked area and the number of cracks of a coating composition containing titanium carbide and a conventional coated steel. Figures 6a-6c are photomicrographs showing the cross-section dimensions of the zinc coating of traditional coated products and products modified with TiB2.

Figures 7a-7c are photomicrographs showing the cross-section dimensions of the zinc flower of conventional coated products with and without titanium. Figures 8a-8c are photomicrographs showing the cross-section dimensions of the zinc flower of traditional coated products and products modified with Tic. Figures 9a-9c are photomicrographs showing the zinc cross-section dimensions of traditional coated products and products modified with a1B2_A1B12. 20

Claims (1)

200404916 Patent Application Scope Application Patent Continued ^ A method for coating steel products using a melting ingot-zinc alloy bath, the improvement of which includes improving the inscription by adding one or more particulate compound ingredients Mouth-to-mouth, and formed on the substrate to produce a coated zinc flower size of about Gamma micron, the finely divided particle compound is selected from the private group consisting of decay compounds' content is about 0. ⑼8 to 0⑼η weight ❽ / 〇 'and has one of titanium and inscription. 2. The method according to item i of the patent application, wherein the particulate compound component is one of TiB2, A1B2, and A1B12. Spring 3. The method as described in item i of the monthly patent $ 巳 circle, wherein the granular compound and the size of the wound particle | circumference is between about G qi micrometers and about 25 micrometers. 4. The method according to item 2 of the scope of the patent application, wherein the particle size of the particulate compound is between about 0.01 micrometers and about 25 micrometers. 5. The method as described in item i of the scope of the patent application, further comprising manufacturing a master alloy of aluminum and adding a content of the particulate compound component thereto and thereafter cooling the master alloy to an effective amount of the The amount of the particle 4 dextrose component is added to the step of a ming-zinc coating bath. Lu ·· a coated steel object, including a steel substrate; and an inscription coating thereon, which is improved and includes the aluminum · zinc coating in an effective amount of one or more options The particulate compound component of the group 0 composed of a boride compound having one of titanium and aluminum is modified. Thus, the aluminum-zinc coating has a zinc flower size of about 400 to 500 microns. 7. The article as described in item 6 of the scope of the application for printing patent, wherein the aluminum-zinc coating is modified with the boride compound at a content of about 0.00000 to 0.00000% by weight. 21 200404916 The last page of the scope of patent application, the scope of patent application 8. The article as described in item 7 of the scope of patent application, wherein the particulate compound component is one of TiB2, A1B2 and A1B12. 5 10 15 9. The article according to item 7 of the scope of patent application, wherein the particle size of the particulate compound component in the coating is between about 0.01 micrometers and about 25 micrometers. 10 · —An aluminum-zinc steel coating composition capable of producing a coated steel substrate having a coated zinc flower size of about 400 to 500 microns, which is improved to include particles containing one or more of an effective amount The aluminum-zinc alloy of the compound component, the particulate compound component is selected from the group consisting of boride compounds, and its content is about 0.0008-0.0012% by weight and has one of titanium and aluminum. 1 1. The composition as described in item 10 of the Shine patent, wherein the particulate compound component is one of TiB2, A1B2, and A1B12. 12. The composition according to item 10 of the scope of the patent application, wherein the particle size of the particulate compound component in the coating is in the range of about 0.01 micrometers to about 25 micrometers. 13. The composition according to item 10 of the scope of application for a patent, wherein the particulate compound component is a boride compound, and the content range of the particulate compound component in the alloy bath is about 0.0008_ 0.0012% by weight of boron. 14. The method as described in item 丨 of the scope of patent application, further comprising varnishing the coated steel product before the skin-rolling of the coated steel product under 20 The article of item further comprises a painted surface on the coated steel. twenty two