JPS609590B2 - Manufacturing method for corrosion-resistant plated steel materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plating method with excellent corrosion resistance.

In the natural environment, ordinary steel corrodes and wears out due to the action of oxygen, water, and ions. Therefore, various plating methods are widely used to prevent corrosion of steel materials. Anti-corrosion plating can be roughly divided into plating that utilizes the anti-corrosive action of zinc, cadmium, etc. (aluminum and tin are also included in special environments), and passivation action of nickel, chromium, lead, copper, etc. It can be divided into periods using . The present invention relates to a method for improving the corrosion resistance of sacrificial anti-corrosion plating mainly used for durable consumable materials, and provides an extremely high level of plating that goes beyond conventional wisdom. The present invention will be described in detail below, focusing mainly on galvanizing. The lifespan of galvanized steel sheets can be determined by the corrosion rate of the plating in the environment and the thickness of the plating.

In the natural environment, zinc produces white corrosion products when it corrodes. The corrosion rate of zinc is greatly influenced by the properties of this corrosion product, such as its fineness, insulation, and solubility. For example, the reason why zinc is severely corroded in an atmosphere containing sulfur dioxide gas is that the corrosion products are easily dissolved in water and cannot exert a protective effect. The formation of coarse conductive corrosion products is a major reason why corrosion occurs quickly in high-temperature water and salt water. In addition to these, the presence of pinholes is a major factor that determines the corrosion rate. In other words, all corrosion of metals in the natural environment can be explained electrochemically, and pinholes in galvanized steel sheets facilitate cathode reactions, significantly increasing corrosion of surrounding zinc. As mentioned above, corrosion products and pinholes are the main causes of corrosion of plating, and many studies and patents have been published so far.

The disclosed corrosion-resistant leech lead plating method involves alloying corrosion-resistant metals such as chromium, nickel, aluminum, magnesium, and cobalt with zinc.

The present invention is basically similar to the above-mentioned improvements, but instead of using a t-alloying method, it uses silica, silicates, metasilicates, silicate compounds of glasses, metal oxides, and phosphates. This is an epoch-making compound in which a borate compound (hereinafter referred to as a composite compound) is combined with zinc. Examples of the application of these composite compounds to plating include chemical conversion treatment and chemical plating, and some examples of surface treatment include dew plating. This is an enamel coating.

The composite galvanized steel sheet formed by this method has characteristics that cannot be considered from common knowledge, and the characteristics will be described below and the novelty of this method will be explained in detail.

The composite compound used in the present invention is an electrically insulating material, and when it is composited with metals such as zinc, the conductivity of the fitting itself decreases,
Cathodic protection ability for steel decreases.

In zinc-rich vents, etc., the amount of binder has to be limited due to this problem, and even with a high concentration zinc coating, the effective amount of zinc useful for cathodic protection is small and the duration is short. Pure zinc plating has a fast corrosion rate and has a short useful life. Figure 1 shows an electrogalvanized steel plate, a steel plate coated with a commercially available zinc-rich paint, and a composite galvanized steel plate according to the present invention, each cut into 10 x 2 pieces, and a single scratch reaching the base material is made with a knife on the test surface. A sample whose back and end surfaces were sealed with beeswax was immersed in a 3% NaCI aqueous solution 200'.
This is a record of each corrosion potential change.

After 20 days only for composite plating materials (potential: -0.8V)
) Furthermore, I added scratches that reach the base material to make it look new. Since the corrosion potential of iron is around 10.6 V, it can be seen that the plating of the present invention protects iron from corrosion over a long period of time, and causes little elution of itself. On the other hand, with electrogalvanizing, zinc dissolves in a short period of time, and with zinc rich venting, iron begins to dissolve in 15 days and becomes rust. FIG. 2 shows the relationship between the silica content and the electrical resistance value for the plating of the present invention. As is clear from FIG. 2, in the present invention as well, when zinc is combined with silica, the electrical conductivity becomes low and plating occurs. However, when the bond is immersed in a corrosive aqueous solution, such as a sodium chloride aqueous solution, it contains an unusually large amount of silica, and despite the poor conductor plating, the sacrificial leaching properties of zinc are effectively suppressed. It was found that it works.

Figure 3 shows the results of evaluating the sacrificial anticorrosion ability of plating by changing the area ratio of iron and plating.

It shows the area of iron that can be cathodic protected against plating area 1, and the couple potential is the corrosion potential of iron (approximately 0.6V)
If it is lower, it will prevent corrosion. In the case of a zinc-rich coating, the upper limit is coating:iron=1:0.5. The sample used was one with a size of 10 x 20 ribs, the surface of which was coated with a clear insulating coating, and then scratched by an amount corresponding to the area ratio. The plating according to the present invention has the ability to cathodically protect about 2 pi of moss of iron in area.

Moreover, as shown in Fig. 1, the potential of the plated steel plate immersed in a 3% NaCI aqueous solution for 20 days was -0.8V (3%N
The corrosion potential of iron in aCI aqueous solution is stable at -0.66 V (cathodic protection is provided by sacrificial elution of the metal), but as shown by the arrow, when a new artificial scratch is made, the potential becomes pure. It reaches -1.0V, which is close to that of zinc, and maintains its ability to cathodically protect iron. In other words, the plating according to the present invention dissolves only a small amount of zinc necessary for cathodic protection of iron, and does not cause excessive corrosion protection more than necessary as seen in pure zinc plating. It is an extremely ideal plating that has the performance of zinc. This composite plating containing silicic acid compounds, etc. also has the characteristic of reducing pinholes in the plating.

That is, normally galvanizing produces plate-like crystals and pinholes are likely to form, but in this method, a plating that looks amorphous at first glance is formed, which is completely different from the normal state. (Zinc crystals are observed in the X-ray view.) FIG. 71 shows a scanning electron micrograph of electrogalvanizing, and FIG. 72 shows a scanning electron micrograph of vacuum-deposited galvanizing using only zinc. FIG. 7 is a photograph showing the appearance of vacuum-deposited zinc-silica plating according to the present invention. The photograph shown in FIG. 73 is difficult to obtain a clear photograph due to a decrease in electrical conductivity, but it is smooth and amorphous. Therefore, it is clear that according to the present invention, a plating without holes can be obtained even with a low plating amount. The mechanism of improved corrosion resistance and cathodic corrosion protection of the coating of the present invention can be explained as follows.

As described later, this method belongs to physical vapor deposition plating, and since all the plating components are evaporated, diffused and condensed, the resulting Enoki plating is a combination of the metal and the composite compound that are continuous from the iron base to the plating surface. A uniform semiconductor layer is formed. That is, although the insulation of the entire plating layer increases, it does not lose its metallic properties, and once scratched, its metallic properties appear. The plating itself is difficult to corrode due to its semiconductor nature. Furthermore, Figure 4 shows the results of measuring anodic polarization curves in a degassed 3% NaCI aqueous solution using a platinum plate as a counter electrode for the plating and electrogalvanizing of the present invention. It can be seen that this is suppressed.

As is clear from the polarization curve diagram in Figure 4, the eluted metal ions simultaneously react with the free silicate ions, borate ions, phosphate ions, or their sol, forming water-insoluble insulating inorganic salts. Forms a corrosion product whose main component is to inhibit further corrosion. The corrosion products are delicate and completely different from conventional zinc mirrors, and there is no apparent rust. Such properties can only be obtained by physical vapor deposition and interlocking. As stated above, we believe that the composite plating according to the present invention is a new plated steel material that does not exist in conventional plated materials due to its plating characteristics and plating shape.

A specific method for achieving the present invention will be described below. The method of the present invention can be obtained by all methods generally referred to as physical vapor deposition methods introduced in known literature.

That is, a vacuum deposition method in which the plating raw material is evaporated under reduced pressure and condensed on the substrate, an ion plating method in which the evaporated plating raw material vapor is ionized under glow discharge and actively deposited on the substrate, and/or an inert gas. A sputtering method has been developed in which a glow discharge is generated in the atmosphere, and the plating raw material is immediately ionized by the impact of ionized gas, and is attracted to the substrate and exposed. Chemical nickel plating, electrolytic nickel plating, etc. are known methods of compounding silicic acid compounds, etc., but their purpose is to increase the hardness of plating, which is completely different from the steel material for durable consumable materials of the present invention. The plating characteristics are also different. The process of the present invention is basically the method shown in FIG. 5, and is common to both batch type and coil type.

Pretreatment includes degreasing, pickling, polishing, etc. performed in the atmosphere, heating in a cyclic atmosphere, polishing in vacuum, dehydration, heating, and ion etching by glow discharge. The plating process is a process in which so-called composite compounds and metals are evaporated, ionized, and precipitated, all of which are carried out under reduced pressure in a multistage system as required.
Post-treatment is not necessarily necessary in this method, but depending on the purpose of the steel material (
For example, for white rust resistance, paint adhesion, scratch prevention, coloring, chromate treatment, phosphate treatment, oiling process, or heating process for the purpose of improving adhesion and alloying, which is partially done in vacuum. There are cases. The pre-treatment and post-treatment in this step have no particular characteristics, and methods similar to ordinary vacuum plating and other plating methods can be employed. The present invention has a pressure of 10
-2Ton to 10-6Torr vacuum.

The optimum range is determined based on the plating method, plating speed, quality level, and economic efficiency. That is, in the case of ion plating or sputtering, it is carried out at a pressure of 10-2 to 10-3 Ton below 10-ITorr, which causes glow discharge, and the gas introduced is nitrogen, helium, argon, or the like. Nitrogen has disadvantages such as the tendency to form nitrides during discharge, and helium has disadvantages such as weak ionizing power, so argon gas is most preferred in the present invention. In the case of vacuum deposition, the pressure can be operated over a wide range from 10-torr to 10-6 torr. It is preferably carried out at a pressure below 10-4 Ton (ie in the range of 10-4 Ton to 10-orr). In the case of vacuum evaporation 1
At a pressure of 0-4T or higher, the deposition rate is slow, and the quality of plating, especially workability and adhesion, deteriorates, and 10-6T
If it is less than 1.5 oz, the line will be extended in actual operation, which is not economical. For ion plating and sputtering, g. - Plating with good adhesion can be obtained by carrying out the process from 10-3Ton where electric discharge occurs to 10-Ton Om. As the evaporation source, the metal and the composite compound can be evaporated separately, or if the evaporation temperatures and vapor pressures are similar, a composite metal source that has been mixed or melted in advance can be used. As the heating source, a resistance heating method, an induction heating method, an electron beam method, or a combination thereof can be used.

Rubbo can be water-cooled steel Rubbo, ceramic, etc. for electron beam, and carbon boat, tungsten boat, tantalum boat, ceramic boat can be used for other heating. In the case of the sputtering method, sputtering is performed using a composite metal or a single metal as a target. The evaporation rate varies depending on the type of metal and composite compound, degree of vacuum, and heating temperature, but is not particularly limited in the case of the present invention. However, unnecessarily high-temperature, high-speed plating under high pressure is not desirable in terms of quality. It is preferable for the temperature of the material to be high in terms of quality, especially adhesion. However, considering the deterioration of yield due to re-evaporation of the metal, the possible temperature is 20 to 30,000, preferably t.
Loo to 200o0 has good adhesion and good yield. The present invention has several combination methods depending on its purpose.

■ A composite method that performs composite plating of a composite compound and metal on the surface of a steel material that has undergone a pretreatment process. ■ A composite method that deposits only metal on the surface of a steel material that has undergone a pretreatment process, and then immediately applies composite plating of a composite compound and metal. Composite method to do.

■ A method in which composite plating of metal and composite compound is applied to the surface of steel material that has gone through a pretreatment process, and then metal is immediately plated.

■ Conventional electroplating: A composite method in which the composite method (■) is applied to the surface of a hot-dipped steel material. Each of these four composite methods provides a plated steel material with its own characteristics. In other words,
In terms of adhesion, methods ■ and ■ are the best. In addition, all methods are good in terms of corrosion resistance, but the method (■) in which the entire plating layer is composite plated is the best, and in the methods (■) and (2), "the underlying metal layer tends to selectively elute." This improves the plating appearance (i.e., silicic acid composite plating changes to a black appearance in proportion to the silicic acid content), or facilitates post-treatment, improves plating, or improves cathodic protection. It is effective when the purpose is to improve the plating of the lower layer. Also, the method (①) can obtain thick plating with excellent corrosion resistance in a short time. It exhibits the same cathodic corrosion protection as conventional plating, and is effective in sealing pinholes in the underlying plating. A composite system is obtained that prevents white rust on the plating surface.The steel material used in the present invention, the metal and the composite compound used in composite plating will be described in detail below.

The steel materials used in the present invention are durable consumable materials such as steel plates, wire rods, and pipes, and are used as they are or after being painted or lined. Plated metals include zinc, cadmium, magnesium, which provide cathodic protection for iron in most natural environments, and alloys containing these metals as main components, or aluminum, which provides cathodic protection for steel in saltwater atmospheres, seawater, and S○2-containing atmospheres. , manganese, and alloys containing these metals as main components.The most effective material according to the purpose of the present invention is zinc, which requires port exit speed control and is widely used as a durable material. The complexing compounds used are silicic acid compounds, metal oxides, phosphate compounds, and borate compounds.

Among these compounds, silicates have a high vapor pressure at a relatively low temperature and are easy to control by evaporation. The silicic acid compound of the present invention includes silicon monoxide, silicon dioxide (silica) oxides and M2
0/Si02 (M is a monovalent metal as an example) ratio is 0 to 2
These are silicic acid, metasilicic acid, and orthosilicates.

M is ``In the above case, the monovalent alkali metal Lj+,N is K
+, Cu+, and other alkali metals and metals e2
Ten? These are metal oxides such as Mg20, Ca20, Sr20, Ba20, Zn20, Fe20, Ni20, Co20, etc. It also includes other materials commonly called glasses, such as borosilicates and aluminosilicates. Metal oxides are oxides of metals baser than metals, such as alumina, titanium oxide, zirconium oxide, and alkaline earth metal oxides. Borate compounds include boron oxide and borate compounds. Phosphates The compounds are primary phosphates, secondary phosphates, and tertiary phosphate compounds.5 These compounding agents lower the electrical resistance of the plating film, reduce the melting of the metal, and reduce the amount of eluted metal ions. Therefore, complexing agents of metal oxides, such as those that provide metal ions more noble than the plating metal, such as Nj30, Co, and Fe20, are effective in the melting of the plating metal. It is undesirable because it promotes
Add 0.1-80% (by weight) of complexing compound.

Corrosion resistance improves in proportion to the composite compound content, and the relationship is as shown in FIG. 6 in the case of silicic acid. In the case of Zn plating, 0.5% silicic acid content provides approximately twice the corrosion resistance, and 20% silicic acid content provides a corrosion resistance of 1M sound and 60% corrosion resistance of several 10M sound. In order to be applicable to materials that are to be post-processed, such as current metal-plated steel plates, it is necessary to consider the adhesion of plating, and in practical terms, 0.
A silicic acid content of 1 to 20% is preferred. Examples of the present invention will be shown below. Example 1 A steel plate after cold rolling, annealing, and temper rolling was subjected to alkaline degreasing, scratch cleaning,
It was washed with water, pickled, dried, placed in a vacuum chamber, and subjected to ion bombardment in an argon stream, followed by vacuum composite plating.

The bombardment conditions were a pressure of 10-3Ton and a bias voltage of 3. Song V was performed for 60 seconds at 5 hA. The plating conditions were as follows: Zinc with a purity of 99.9% was heated and evaporated in a tungsten resistance boat, and at the same time, quartz was placed in a copper rubbo and heated with an electron beam (hereinafter abbreviated as EB) output of 1 to 2 KW. The pressure during plating was 2 x 10-5 Torr. The distance between the substrate and the evaporation source is 150 cm. The plating thickness was controlled by changing the time using a shutter and the Si02 content was controlled by changing the EB output, and was deposited simultaneously with zinc. The temperature of the steel plate during plating is heated from the back side with a tantalum sheathed heater to 50~1.
I went with 00oo. The eutectoid stain composition was determined by chemical analysis. The appearance of the resulting glaze changes from white (0-5%) to blue (10-20%) as the silica content increases.
) → black (40%), and when observed using a scanning exposure microscope (hereinafter abbreviated as SEM), it appears smooth and blurred as shown in the photograph shown in FIG. 7.

Zinc crystals were observed by X-ray diffraction, and the silica was amorphous. In order to investigate corrosion resistance, a salt water fog test (hereinafter abbreviated as S.S.T.) as specified in JIS-Z-2371 was conducted, and after a certain period of time, the white rust was removed with concentrated chromium acid, and the corrosion loss was measured. The amount of corrosion per unit area was calculated and the results are shown in FIG.

Plating containing 60% silica (plating amount 10 days/final) did not generate white rust, and no red rust occurred even after 40 feeding hours. In addition, the same plating material was artificially scratched and 3%
The results of measuring the time-corrosion potential curve in an aqueous NaCI solution are shown in FIG. The results of measuring the electrical conductivity of the plating of the present invention are shown in FIG.

In order to investigate the cathodic corrosion protection ability of the obtained silica composite plating against iron, the area ratio of the iron and plating containing 60% SiO2 was changed and the sample was immersed in a 3% NaCI aqueous solution, and the couple potential at that time was measured. The results are shown in Figure 3. Indicated. Figure 4 shows the results of composite galvanizing and electrogalvanizing when anodic polarization was performed in a 3% NaCI aqueous solution.

As shown by the various tests conducted above, the silica-zinc composite plating obtained in this example exhibited excellent corrosion resistance.

Example 2 A steel plate pretreated according to the procedure of Example 1 was subjected to ion plating under the following conditions.

Argon gas pressure 5×10-3 to 7×10-3 Ton, bias voltage 4. By discharging it with VI and hA, the zinc with a purity of 99.9% was evaporated and ionized from the resistance boat, and at the same time, the quartz in the Mizuboko Rubbo was evaporated and ionized by EB heating, and the amount of light was approximately 20 minutes per side. The silica content was controlled by the plating time so that the EB output was 0.8KW, 0.
．． Change to 7KW, 1.0KW, 1.9KW and 0 respectively.
．． It was controlled at 6, 5%, 15%, and 25%. The corrosion resistance of the obtained stain was measured by S. S. T. When evaluated, the improvement was proportional to the silica content, and the time until red rust appeared was 2 feeding hours for pure zinc, 30 hours for zinc containing 0.5% silica, and 7 feeding hours for zinc containing 5% silica.
Field time, silica 15% zinc 20 Haterama, silica 25
% Zinc was 30 Hataterama. Also, the adhesion of the plating was evaluated by bending it 90 degrees, but no peeling was observed. Example 3 Zinc was melted and homogenized in an argon inert gas onto a steel plate that had been pretreated according to the procedure of Example 1. Silica was placed in a water-cooled tube as an evaporation source, and the pressure was 2 x 10-5 To.
rr, I evaporated it with EB2KW and created a composite plating of 3 Buddhas.

The resulting flask contained about 40% silica and had a black appearance as in Example 1. S. T. No red rust was observed even after 40 hours had passed. In addition, when we applied 20 coats of commercially available baking type melamine alkyd resin paint and examined its adhesion, it passed the JIS standard grid test (JIS-G-133).
), no peeling was observed in the bending test (JIS-K-5400). Example 4 First, 6.5×l of zinc was applied from a resistance boat to a steel plate pretreated according to the procedure of Example 1.
Ion plating was performed by glow discharge at o-tsubo orr, bias voltage low V2 hA, and argon gas pressure 2 x 10-2 Torr. Do another and open the shutter to E from the water-cooled steel Rubbo.
BIKW heated silica is evaporated and composite galvanized 1
I went to Buddha.

The corrosion resistance of the obtained stain is S. S. T. After 40 feeding hours, no red rust was observed and 3R bending process (JIS-G-331
2), and did not peel off. Example 5 A steel plate pretreated according to the procedure of Example 1 was heated with EB from a zinc water-cooled steel rubbo from a resistance boat to simultaneously evaporate silica.
After folding the French joint, close the shutter on the steel Rubbo and remove only the zinc. Or the car got sticky.

The corrosion resistance of the obtained stain is S. ST. White rust occurred after 1 hour, but red rust did not occur even after 400 hours. Furthermore, when a commercially available zinc phosphate treatment was applied, phosphate treatment using the same machine as electrogalvanizing was possible. Example 6 In the same manner as in Example 1, commercially available soda glass was placed in a water-cooled copper rubbo and co-evaporated and eutectoided with zinc to produce a composite galvanized steel sheet with a thickness of 3 mm.

The corrosion resistance of the obtained stain is S. S. T. No red rust was observed even after 300 hours. Example 7 Instead of the soda glass in Example 6, potassium glass,
Composite zinc plating was similarly created using magnesium silicate, calcium silicate, strontium silicate, L barium silicate, zinc silicate, iron silicate, nickel silicate, and cobalt silicate.

The corrosion resistance of plating is S. S. T. No red rust was observed after 10 legs. Example 8 Using the method of Example 1, aluminum was placed in a resistance boat and evaporated to form a composite aluminum plating containing 10% silica (
A steel plate (3mm thick) was prepared.

The plating pinholes are determined by the ferrooxyl test (JIS-
H-0402) gave a score of 0 per 1, which was significantly improved compared to 10 points for single aluminum plating, and the corrosion resistance also improved to S. S. T
．． No red rust was observed after 50 hours. . Example
9 In place of the soda glass in Example 6, zinc phosphate and zinc borate were evaporated from water-cooled steel Rubbo using an EB heating chick W to create a composite plating.

The content of phosphorus and boron in the plating is approximately 5% and 2%.
% and the thickness of the lining was 2 microns. The corrosion resistance of plating is S. S. T. Some red rust had occurred during the 5-year period. Example 10 Put aluminum into a resistance boat according to the procedure of Example 2, first suppress Si02-Zn evaporation with a shutter, and after 0.1 degrees of aluminum plating, open the shutter and start Zn-AI-Si02 composite plating. I went to IM.

The adhesion of the plating does not peel off even when bent, and the corrosion resistance is S. S.
T. Red rust did not occur even after 30 feeding hours had passed. Example 11 After the surface was treated in the same manner as in Example 1, the argon was stopped, zinc was evaporated from the resistance boat at a vacuum level of 1.4 x 10-5, and alumina was heated by EB (IKW) from a water-cooled steel rubbo.
Evaporated.

The plating amount is 70mm/(one side), and the alumina content is 0.5.
%Met. The corrosion resistance of plating was determined by S. S. T. When examined, red rust developed after 15 cycles, and the corrosion resistance was approximately twice that of pure zinc plating. Example 12 Titanium oxide and zirconium oxide, which were substituted for alumina in Example 11, were evaporated by EB heating to produce a composite zinc plating.

The content was 5% in each case. S. S. T. The corrosion rate of plating was 0.4 mm per hour using the method of Example 1. Example 13 After degreasing and pickling a cold rolled steel plate, plating with zinc sulfate (pH = 1.2) at a current density of 10 A/d and dew plating of about 3 degrees, followed by washing with water and forced drying. The pretreatment of Example 1 was carried out, and vacuum composite plating was performed at 1r (Sample E).

Similarly, a continuous hot-dip galvanized steel plate (with a plating thickness of 1) was subjected to vacuum composite plating (sample D). The composition of the composite plating was 90% zinc and 10% silica.

Corrosion resistance is S. S. T. As a result of the investigation, the time required for red rust to occur was 5 hours for sample E (approximately three times that of pure zinc), and 10 hours for sample D (one needle sound of pure zinc). Further, when the adhesion was evaluated by rainbow bending, no peeling was observed.

[Brief explanation of the drawing]

FIG. 1 shows the results of changes in corrosion potential over time in a 3% sodium chloride aqueous solution for various surface-treated steel sheets with artificial scratches. FIG. 2 shows the relationship between the silica content and the electrical resistance value for the plating of the present invention. FIG. 3 shows the cathodic corrosion protection ability against iron of various surface-treated steel sheets including plating according to the present invention, which was investigated by changing the area ratio of iron to plating. FIG. 4 is an anodic polarization curve diagram in a degassed 3% sodium chloride aqueous solution for plating and electrogalvanizing of the present invention. (A platinum electrode is used as the counter electrode.) FIG. 5 shows the basic steps of the manufacturing process of the present invention. FIG. 6 shows the silica content in the plating film of the present invention and the S.I. S. T. FIG. 3 is a diagram showing the relationship between the corrosion rate of FIG. 71 is a scanning electric microscope (SEM) photograph of zinc plating deposited from acidic sulfuric acid. Figure 7 2
This is an SEM photograph of three plating layers with a pressure of 2×10-5 Torr and a thickness of 3 platings with vacuum evaporation plating. Figure 7-3 is an SEM photograph of vacuum-deposited zinc-silica composite plating at a pressure of 2 x 10-5 Torr, plating thickness of 3 Torr, and binary evaporation. Kaya/Figure 2 Figures 3 Figures Traditional 4 Figures Many Figures Many Figures g' 7 Figures

Claims (1)

[Claims] 1. A compound consisting of one or more of silicic acid compounds, metal oxides, borate compounds, and phosphate compounds and a metal or alloy having a sacrificial anticorrosion effect on iron. A method for producing a corrosion-resistant plated steel material, comprising simultaneously plating the compound and a metal or alloy onto the plated steel material by vapor deposition. 2. After electroplating, hot-melting, or physical vapor deposition of a metal or alloy that has a sacrificial anticorrosion effect on iron,
Furthermore, a compound consisting of one or more of silicate compounds, metal oxide borate compounds, and phosphate compounds and a metal or alloy having a sacrificial anticorrosion effect on iron are simultaneously applied by physical vapor deposition. A method for producing corrosion-resistant plated steel material characterized by plating. 3 Coating steel materials by physical vapor deposition with one or more compounds of silicate compounds, metal oxides, borate compounds, and phosphate compounds, and metals or alloys that have a sacrificial anticorrosion effect on iron. After simultaneously plating the compound and the metal or alloy, a metal or alloy having a sacrificial anti-corrosion effect on iron is further plated by physical vapor deposition, electroplating, or hot-dip plating. A method for manufacturing corrosion-resistant plated steel materials.