JPH02255286A - Production of copper composite steel sheet - Google Patents

Abstract

PURPOSE:To produce the copper composite steel sheet which is excellent in corrosion resistance, weatherability, durability, installation characteristic, etc., is inexpensive and has a high-grade feel by subjecting the surface of a base steel sheet to an Ni alloy plating, then to a Cu plating and rolling and applying a copper plate on this plating layer. CONSTITUTION:The base steel sheet, such as stainless steel sheet, is subjected to required pretreatments, such as degreasing and pickling and thereafter, at least one surface thereof is subjected to the Ni alloy plating. This plating is preferably uniformly executed on the steel sheet surface to about 1.5g/m<2> deposition in a manner as not to allow a slight base exposed part to remain. The Ni plating layer is in succession subjected to the Cu plating. The Cu plating is executed as to uniformly coat the above- mentioned Ni alloy plating surface at about 10g/m<2>. The copper plate is thereafter rolled and applied on this plating layer. The rolling conditions are regulated to allow the selection of such an optimum cold draft as to expose the fresh surfaces at all times at the joint boundary of the copper plate and the Cu plating layer. The above- mentioned copper plate is securely jointed in this way and the copper composite steel sheet having the outdoor weatherability, etc., stable over a long period of time is obtd.

Description

[Detailed description of the invention] (Industrial field of application) The present invention has #4 excellent corrosion resistance, especially outdoor weather resistance!!
The present invention relates to a method for producing a composite steel plate, and the copper composite steel plate can be used stably over a long period of time as various construction members.

(Conventional technology) Steel plates have been used for many years as roofing materials, wall materials, etc. However, in order to use steel plates alone, it is necessary to maintain the rigidity and strength of the metal material. This required a certain thickness, making it a fairly expensive material, and the material itself was hard, requiring special skill and ingenuity in the processing method.For this reason, steel plated steel sheets were proposed, but under normal corrosive environments. So, if scratches that reach the substrate occur during construction or use,
The plating layer did not function as a sacrificial anode, and instead had a defect that promoted pitting corrosion of the substrate.

This problem can be considerably improved by using a stainless steel plate as the substrate, but it does not solve the problem of being easily scratched.In this respect, it would be better to make the plating layer thicker, but it would reduce the productivity of the plating line. Therefore, an effective solution cannot be reached.

As described above, the #i-based materials that have traditionally been used as roofing and wall materials each have their own drawbacks, and there is a need for materials that are cheaper, easier to construct, and have higher quality reliability. .

(Problems to be Solved by the Invention) In view of the above, the present invention seeks to provide a method for manufacturing #II composite steel plate as a material that is cheaper than steel plate, has a longer life than steel plated steel plate, and is easier to construct.

(Means for Solving the Problems) The present invention includes a first step of applying nickel plating to at least one surface of a base steel plate, a second step of applying steel plating on the nickel plating layer, and a second step of applying nickel plating on at least one surface of a base steel plate, and a second step of applying nickel plating on the nickel plating layer. This is a method for manufacturing a copper composite steel plate through the third step of rolling and coating.Here, the base steel plate includes stainless steel plates, ordinary steel plates,
(Hot-rolled steel sheets, cold-rolled steel sheets, or other materials are hot-dipped or coated with a known plating layer such as aluminum plating, zinc plating, chrome plating, tin plating, zinc-aluminum alloy plating, iron-zinc alloy plating, etc. on at least one side. This also includes steel sheets that have been coated with electroplating, etc. ◎If the base steel sheet is a regular steel sheet, a copper plating layer with better layer density can be obtained compared to a stainless steel sheet, so nickel can serve as a base. A plating layer may not always be necessary.Furthermore, in the case of a single-sided plated steel sheet, the non-plated surface is used as a composite treatment surface.

(Function 2) The base steel plate can obtain a steel plating layer with good adhesion through the nickel plating layer, and the steel plating layer generates a new surface on top of the steel plate to be rolled and composited, thereby strengthening the steel plate. Join.

(Example) To describe the specific means of the present invention below, when the base steel plate is a stainless steel plate, the plated surface is first degreased by cathodic electrolysis treatment in a caustic soda or sodium orthosilicate solution, and after washing with water, the plated surface is usually degreased. is subjected to cathodic electrolytic pickling, but in the case of stainless steel sheets, pickling properties may vary depending on the ferritic type or austenitic type, especially the content of 0r1N1, Sl, MOlo, etc. The surface of the steel sheet, whose water wettability has been ensured by pickling, is thoroughly washed with water so that no residue of the pickling solution remains attached, and then m′gIC=Tsukeru plating is performed.The role of this lower plating layer is as follows. The objective is to ensure sufficient adhesion between the subsequently treated upper steel plating layer and the base steel plate. Therefore, the nickel plating layer needs to cover the surface of the steel plate uniformly so that no minute exposed parts of the base material remain, but it does not need to be an excessive amount of plating.In the case of a stainless steel plate, it is 1.57 fr! Sufficient results were obtained with a small amount of plating. In addition, if steel plating is applied directly to the surface of the steel sheet without applying a nickel plating layer, it is not clear before the steel is combined, but the appropriate rolling rate range for the steel plate when combining the steel is narrow, and rolling rate management is required. It becomes necessary to carry out the process strictly at a higher rolling reduction rate. In other words, it is disadvantageous in terms of manufacturing conditions, and #! If the adhesion between the steel layer and the substrate after composite bonding is weak (particularly when the reduction rate when joining the steel by rolling is low (particularly noticeable when the rolling reduction is less than 35% of the initial value), the end face of the cut part If the steel layer is immersed in a 5% saline solution for 10 days at room temperature after a bending test, deterioration of the adhesion between the m layer and the substrate is easily observed.

Although the mechanism of action of the nickel plating layer is not clear, it eliminates stable oxidation on the stainless steel plate and forms a plating layer with good adhesion to the base, making the above-mentioned upper copper plating layer stronger against the base. It is extremely effective in adhering closely to the skin. As is clear from its purpose, it is sufficient to apply nickel plating to one side, and this purpose is easily achieved if the anode is not placed on the non-plated side during electrolytic treatment.

The nickel-plated steel plate is then subjected to steel plating. The nickel plating process and the steel plating process do not necessarily have to be continuous. From the viewpoint of adhesion between both layers, it is preferable to perform the plating process continuously as much as possible. If it is not possible to perform both plating processes continuously for unavoidable reasons, wet brushing or dilute hydrochloric acid treatment is applied to the nickel plated surface immediately before steel plating. ◇The role of the rope plating layer is between the composite layer and the nickel-plated base steel sheet! In order to maintain m strength, it is important that the underlying nickel-plated surface is uniformly covered with a steel plating layer.This point is ensured, and the plating is sufficient to generate a new surface at the interface when rolling jointed with the steel plate. The plating amount may be any amount, preferably a plating amount of 10/I or more.

Next, a steel plate (including in the form of a film) is cold-rolled and joined to the surface of the steel plating layer.There is no dirt on the surface of the plated base steel plate and the surface of the steel plate that would inhibit good adhesion between the two materials. It is especially important that a chemically stable fostering film does not exist, and if there is a possibility that such adhesion inhibiting factors remain, physical means (e.g. Scotchprite polishing or wire brushing) In addition, during cold rolling, important things are the rolling blades, rolling roll diameter,
The optimum cold rolling rate of 72 is selected depending on the rolling speed etc. so that a new surface constantly appears at the joint interface between the steel plate and the steel plating layer.

To specifically explain the present invention based on examples, the thickness 'gQ
, 4m stainless steel plate (5t7S 304, plate width 20
0) was electrolytically degreased in a 5% sodium orthosilicate solution at 45 degrees with the steel plate used as a cathode, thoroughly washed with water, then electrolytically deposited in a 0.15% sulfuric acid solution at 55 degrees, and then thoroughly degreased. After washing with water, a sample of a copper composite steel plate was obtained by electrolytic nickel plating, electrolytic steel plating, and rolling bonding of the copper plate according to the following steps.

(1) In a plating bath consisting of nickel chloride 240/l and hydrochloric acid 100/l, the temperature was 40a1 and the current density was 10A.
/am', the nickel plating time was selected as shown in Table 1, and the amount of plating layer was confirmed.

(2) After thoroughly washing the surface of the nickel plated layer with water, sulfuric acid steel 500/l, sulfuric acid 100/7. In a bath consisting of 30 g of ammonia sulfate, at a temperature of 2500 and a current density of 2 OA/ad, the steel plating time was selected as shown in Table 1 and as in Examples 1 to 9, and the amount of plating deposited was adjusted and confirmed. After washing thoroughly with water, it was dried to obtain a copper composite steel plate.

(8) Rolling mill between two installations (work roll diameter is upper roll 80
A steel plate with a thickness of 1.0 g and 1 m is rolled on a stainless steel plate with steel plating on the upper layer using a rolling force of 20% 0) n/1.
It was cold rolled and joined at 0.

In the table, ratio -1 refers to Comparative Example 1, in which both nickel plating and steel plating were omitted, that is, only pickling was performed,
A rolling load of 20.0) n/10 steel composite was attempted.

Ratio-2 is one in which nickel plating is omitted, that is, only steel plating is applied, and then copper composite is applied at a rolling load of 20.0 mm/10-.

Ratio-6 is one in which only nickel plating is applied, copper plating is omitted, and copper composite is applied at a rolling load of 1!10.0) n/105 mm.

The following evaluation tests were conducted on each sample of the copper composite steel sheet described above.

(1) Peel test: Cut out the sample with a width of 25 mm, and evaluate the adhesion between the composite layer and the steel plate using a 180 peel test. (2) Adhesive bending test. alms,
The state of peeling between the composite layer and the base steel plate was observed.

(s) Salt water immersion test The closely bent test piece was immersed in 5% saline (40°0) for 6 weeks, and the progress of peeling at the end face was observed.

(4) Cold cycle test A 50 x 150 m test piece was immersed in a hot silicone oil bath of 1200 m for 5 minutes, then cooled to room temperature (cold air was blown using a vacuum cleaner) and held for 5 minutes.Cold heat cycle 15.
The test was repeated 00 times, and peeling at the end face, occurrence of blisters on the steel surface, occurrence of cracks in the steel layer, etc. were observed.

Table 1 shows the above samples and the test results for the samples.

In Table 1, ◎ in the peel test indicates that the adhesion strength is sufficient and the steel plate itself breaks. In other contact bending tests and salt water immersion tests, ◎ indicates that no abnormality or deterioration is observed compared to before the test.

Δ indicates slight peeling of the steel composite layer at the bending or other processing area. X indicates that the composite layer was only slightly peeled. ◎ in the cooling/heating cycle test means that no abnormality or deterioration is observed in the peeling test after applying the cooling/heating cycle, as in the initial stage. Δ indicates that the copper composite layer has slightly peeled off at the bending and other processing parts. × is ms of composite layer
is clearly recognized, and the O values in the peel test, adhesion bending test, and cooling/heating cycle are recognized as having almost no abnormality.

(Effects of the Invention) As described above, according to the present invention, as is clear from the test results, not only a durable material (copper composite steel plate) with excellent corrosion resistance and weather resistance is provided, but also a combination of steel material and steel plate. It has the characteristics of providing a luxurious feel with a combination of properties and easy construction.

Claims (2)

[Claims] (1) Copper consisting of a first step of applying nickel plating to at least one side of a base steel sheet, a second step of applying copper plating on the nickel plating layer, and a third step of rolling and coating the steel sheet on the plating layer. Method for manufacturing composite steel plates. (2) Claim (1) in which the base steel plate is a stainless steel plate.
The method for manufacturing the copper composite steel sheet described above.