CN101010450A - Black steel sheet excellent in electromagnetic wave shielding property, electromagnetic wave shielding member and electromagnetic wave shielding case - Google Patents
Black steel sheet excellent in electromagnetic wave shielding property, electromagnetic wave shielding member and electromagnetic wave shielding case Download PDFInfo
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Abstract
A black steel sheet which has a Zn-Ni plated steel sheet having a blackening treatment layer and a coating layer formed on the surface thereof, characterized in that said blackening treatment layer has a thickness of 0.01 to 1.0 mum, and said Zn-Ni plated steel sheet having a blackening treatment layer has a surface roughness wherein the arithmetic average roughness (Ra) is 0.7 to 20 mum and the number of peaks per inch (PPI) is 180 or more.
Description
Technical field
The present invention relates to the black steel sheet of excellent in electromagnetic wave shielding property, particularly not only have appearance of black and erosion resistance, and can advantageously improve the steel plate of electromagnetic wave shielding performance.
In addition, the present invention relates to use the electromagnetic wave shielding member and the electromagnetic wave shielding case of the black steel sheet of above-mentioned excellent in electromagnetic wave shielding property.
Background technology
In the past, the black steel sheet that handle through melanism on the surface was widely used for office equipment such as computer, duplicating machine, and household appliances such as air-conditioning are in trolley part and the inside fitting building materials etc.The common following manufacturing of above-mentioned black steel sheet: at the surface coated blackwash of galvanized steel plate, perhaps implementing melanism on the surfacing of plating Zn-Ni steel plate (for example handles, anode electrolysis, catholyte, alternately electrolysis, anodic oxidation) after, the coating more than 1 layer formed.In one method of back, the reason that forms coating is only to carry out the melanism processing can not obtain sufficient erosion resistance.
But, the former black steel sheet, in order with blackwash bottom to be covered fully, needing increases the thickness of filming, so have problems aspect electromagnetic wave shielding performance.
On the other hand, the latter's black steel sheet, owing to handle formation melanism processing layer by melanism after, form organic and/or the mineral-type coating, so certainly exist the problem that is difficult to obtain sufficient electromagnetic wave shielding performance.
But, black steel sheet about the latter, disclose when forming the coating that covers the melanism processing layer, added the coating composition of metal ion, water-soluble organic resin, water dispersible organic resin, glycoluril resin and acid by utilization, thereby can filming improve electromagnetic wave shielding performance and when obtaining film, can access good appearance of black and the method for erosion resistance (for example, patent documentation 1: TOHKEMY 2004-188976 communique).
In addition, also disclose in surface treated steel plate with organic and/or mineral-type tunicle, by the centre of surface line average roughness Ra after the combination tunicle forms in suitable scope with by film thickness, (for example, patent documentation 2: TOHKEMY 2004-156081 communique) to obtain the method for the surface treated steel plate of electromagnetic wave shielding performance and excellent corrosion resistance.
In recent years, in electronics, machine field, the unwanted electromagnetic wave that is leaked out by machine enters other machine, and electromagnetic interference (EMI:Electricmagnetic Interference) problem that causes some dysfunction, mal-operation is come to the surface.In addition, except influential to machine, hertzian wave is also influential to human body.
As its countermeasure, the method that useful metal plate (conductor) is surrounded noise-producing source.But, on the basket that surrounds noise-producing source, there are interface or junction surface, hertzian wave leaks out from its gap portion.Therefore, when surface treated steel plate was used for basket, interface or junction surface needed sufficient electromagnetic wave shielding performance.Therefore, be necessary a large amount of contact conducting regions that cover entire contact surface that form between the surface treated steel plate that is contacted with interface or junction surface.
In patent documentation 1, the black steel sheet of appearance of black, erosion resistance and excellent in electromagnetic wave shielding property is disclosed.It improves electromagnetic wave shielding performance by making the coating filming on the plating Zn-Ni steel plate of handling through melanism.
But, owing to consider surfaceness through the plating Zn-Ni steel plate of melanism processing, when so surfaceness changes, even form the coating of identical adhesion amount, also be difficult to form the conducting region at interface or junction surface, and the minimizing of conducting region number, the problem of electromagnetic wave shielding performance variation appears in the result.In addition, because the thickness of melanism processing layer is not stipulated yet, so there is the poor more problem of the thick more electromagnetic wave shielding performance of this thickness.
In addition, in patent documentation 2, disclose, the method for the surface treated steel plate of electromagnetic wave shielding performance and excellent corrosion resistance is provided by the centre of surface line average roughness Ra after the combination coating forms in suitable scope with by film thickness.But, in the method, owing to do not consider the concavo-convex of surface of steel plate, the peak number PPI of per unit length just, so when PPI was low, the conducting region number at interface and junction surface must reduce, result's appearance can not obtain the problem of sufficient electromagnetic wave shielding performance.
Summary of the invention
In order to address the above problem effectively, the objective of the invention is to, by the interface of the basket that suppresses effectively to constitute or the electromagnetic-wave leakage at junction surface by surface treated steel plate, provide to show good electromagnetic wave shielding performance, and the black steel sheet that appearance of black is good, erosion resistance is also good.
In addition, the object of the present invention is to provide the electromagnetic wave shielding member that uses above-mentioned black steel sheet, and the electromagnetic wave shielding case that forms by above-mentioned black steel sheet.
The inventor is in order to solve above-mentioned problem, carried out deep research repeatedly, the result obtains following opinion: in the past, when when improving electromagnetic wave shielding performance and be the surfaceness of the plating Zn-Ni steel plate of purpose regulation with melanism processing layer, use common roughness standards such as arithmetic average roughness Ra, but, electromagnetic wave shielding performance is improved effectively, only the surfaceness with common roughness standards regulation steel plate such as arithmetic average roughness is not enough, and the peak number PPI of per unit length also has great importance.And, find that also the thickness of melanism processing layer also can influence electromagnetic wave shielding performance.
The present invention is a foundation with above-mentioned opinion.
That is, main composition of the present invention is as follows.
(1) a kind of black steel sheet of excellent in electromagnetic wave shielding property, it is characterized in that, on the surface of plating Zn-Ni steel plate, have in the black steel sheet of coating with melanism processing layer, the thickness of this melanism processing layer is 0.01～1.0 μ m, and the surfaceness with plating Zn-Ni steel plate of this melanism processing layer is 0.7～2.0 μ m with arithmetic average roughness Ra, and the peak number PPI of per inch is more than 180.
According to the black steel sheet of above-mentioned (1) described excellent in electromagnetic wave shielding property, it is characterized in that (2) the peak number PPI of per inch is 200～400.
(3) according to the black steel sheet of above-mentioned (1) or (2) described excellent in electromagnetic wave shielding property, it is characterized in that, when the peak number PPI that with arithmetic average roughness Ra is x (μ m), per inch is that the adhesion amount of y, each face of coating is z (g/m
2) time, x, y, z satisfy following formula.
z≤(0.010x-0.0077)y-1.05x+2.16
(4) a kind of electromagnetic wave shielding member is characterized in that, each described black steel sheet in all or part of use above-mentioned (1)～(3) of parts.
(5) a kind of electromagnetic wave shielding case is characterized in that, basket uses each described black steel sheet formation in above-mentioned (1)～(3).
According to the present invention, can control the interface of the basket that constitutes by surface treated steel plate or the electromagnetic-wave leakage at junction surface effectively, provide to show good electromagnetic wave shielding performance, and appearance of black and the also good black steel sheet of erosion resistance.
In addition, the present invention can provide the electromagnetic wave shielding member of excellent in electromagnetic wave shielding property by above-mentioned black steel sheet being used for all or part of of parts.
And the present invention can provide the electromagnetic wave shielding case of excellent in electromagnetic wave shielding property by forming basket with above-mentioned black steel sheet.
Description of drawings
Fig. 1 be expression Ra (x) be 2.0 μ m, PPI (y) be 200～400 o'clock PPI (y) with the adhesion amount z (g/m of coating
2) the mode chart of preferable range.
Fig. 2 is the mode chart that is used to estimate the leakage noise determinator of electromagnetic wave shielding performance.
Fig. 3 is the mode chart that is used to estimate the basket of electromagnetic wave shielding performance.
The figure of the strength of electric field of Fig. 4 leakage noise that is the expression plating Zn-Ni steel plate (reference example) that will not have a coating as the time and the relation of frequency for the examination material.
Fig. 5 is expression with example 7 serve as the figure of the relation of the strength of electric field of leakage noise when trying material and frequency.
Fig. 6 does not place on the aluminum basket of presentation graphs 2 shown devices for the examination material, the figure of the relation of the strength of electric field of leakage noise and frequency when measuring under open state.
Fig. 7 does not place on the aluminum basket of presentation graphs 2 shown devices for the examination material, in open state and do not launch the figure of the relation of the strength of electric field of leakage noise when measuring extraneous noise under the electromagnetic situation of output and frequency.
Embodiment
Specifically describe the present invention below.
At first, illustrate that the thickness that will plate the melanism processing layer that forms on the Zn-Ni steel plate among the present invention is limited to the interior reason of scope of 0.01～1.0 μ m.
The melanism processing layer that forms on the plating Zn-Ni steel plate be by anodic oxidation etc. forms layer, owing to be not good conductor, so if bed thickness surpasses 1.0 μ m, even then under the state that does not form coating, also variation of the electromagnetic wave shielding performance at interface or junction surface on the basket is so should make thickness below 1.0 μ m.On the other hand, if the thickness of melanism processing layer then can not obtain sufficient appearance of black, so should make thickness more than 0.01 μ m less than 0.01 μ m.
Then, illustrate, arithmetic average roughness Ra is limited to 0.7～2.0 μ m, and the peak number PPI of qualification per inch is in the reason more than 180 for the surfaceness of the plating Zn-Ni steel plate of handling through melanism.
The Ra that in the past passed through the plating Zn-Ni steel plate of common melanism processing is about 0.5～1.5 μ m, and the peak number PPI of per inch is about 120～160.
In the present invention, from make on the plating Zn-Ni steel plate of handling through melanism coating partly filming, form the viewpoint of conducting region, should make Ra higher.If this Ra is less than 0.7 μ m, then concavo-convex diminishing, partial film zone becomes and is difficult to form when forming coating.Therefore, the surface roughness characteristics for the plating Zn-Ni steel plate of handling through melanism should make Ra more than 0.7 μ m.
On the other hand, surpass 2.0 μ m as if Ra, though then effective to electromagnetic wave shielding performance, for the surface 100% that makes the plating Zn-Ni steel plate of handling through melanism covers and show erosion resistance by coating, the necessary adhesion amount that increases coating is so cost improves.Therefore, the surface roughness characteristics for the plating Zn-Ni steel plate of handling through melanism should make Ra below 2.0 μ m.
In addition, in the present invention,, should make PPI higher from a large amount of viewpoints that form the partial thin film zone of coating on the plating Zn-Ni steel plate of handling through melanism on the whole surface.That is, if the PPI of per inch is less than 180, then partial film number of regions is few, is difficult to obtain sufficient electromagnetic wave shielding performance.Therefore, the surface roughness characteristics for the plating Zn-Ni steel plate of handling through melanism should make PPI more than 180.More preferably PPI is more than 200.
On the other hand, there is no particular limitation for the upper limit of PPI value, but if PPI surpasses 400, a large amount of formation in then partial film zone, erosion resistance might descend as a result.Therefore, preferably make PPI below 400.
And in order to ensure superior corrosion resistance and coating adaptation, the thickness that preferably makes plating Zn-Ni layer is about 1～5 μ m.
In addition, there is no need to make the full depth of this plating Zn-Ni layer is the melanism processing layer, and only need make the thickness of 0.01～1.0 μ m of skin section as mentioned above is the melanism processing layer.
And there is no particular limitation for the melanism treatment process, and the anode electrolysis in treatment solution of Shi Yonging, catholyte, alternately electrolysis, anodic oxidation etc. in the past all are suitable for.
In addition,, adjust kind, concentration and the pH of the oxygenant of treatment solution, and the method for the treatment condition of current density, electrolysis time, electric quantity density is very effective as the method for control melanism processing layer thickness.
Then, at the coating of the surface of the melanism processing layer that as above forms formation more than 1 layer.That is, only can not obtain sufficient erosion resistance through the surface after the melanism processing.
As above-mentioned coating, so long as erosion resistance after improving melanism and handling and the coating that do not damage appearance of black all be suitable for, especially preferably coating that constitutes by chromic salt and organic envelope or the coating that constitutes by organic and/or inorganic tunicle etc.
In order to obtain sufficient erosion resistance, the adhesion amount of above-mentioned coating is preferably at 0.6g/m
2More than.
In addition, for the higher limit of coating adhesion amount, when the Ra of the plating Zn-Ni surface of steel plate with melanism processing layer or the size of PPI, for example when Ra=2.0 μ m, PPI=180, in order to obtain good electromagnetic wave shielding performance, preferably each face is at 2.3g/m
2About following.
In addition, when Ra=2.0 μ m, PPI=200, preferably each face is at 2.5g/m
2About following.
And when Ra=2.0 μ m, PPI=400, preferred each face of the adhesion amount of coating is at 5.0g/m
2About following.
In addition, for the higher limit of coating adhesion amount, when the peak number PPI that with arithmetic average roughness Ra is x (μ m), per inch is that the adhesion amount of y, each face of coating is z (g/m
2) time, x, y, z preferably satisfy following formula (1).
z≤(0.010x-0.0077)y-1.05x+2.16 (1)
When adhesion amount z satisfied formula (1), from guaranteeing the viewpoint of firing point, it became the Ra of suitable Coated Steel and the adhesion amount of PPI, can obtain good especially electromagnetic wave shielding performance.In formula (1), during with Ra (x)=2.0 μ m substitution, the adhesion amount z (g/m of PPI (y) and coating
2) relation as shown in Figure 1.The adhesion amount that preferably makes coating is in scope shown in Figure 1.
Then, electromagnetic wave shielding member that uses above-mentioned black steel sheet and the electromagnetic wave shielding case that is formed by above-mentioned black steel sheet are described.
In the basket that uses surface treated steel plate, what electromagnetic wave shielding performance especially became problem is the clinch of surface treated steel plate.Therefore, black steel sheet of the present invention is applicable to this clinch at least, just can obtain good electromagnetic wave shielding performance.All or part of of Here it is parts uses the electromagnetic wave shielding member of black steel sheet of the present invention.
In addition, if clinch not only makes being made of black steel sheet of the present invention all of basket, then can obtain good especially electromagnetic wave shielding performance.Here it is electromagnetic wave shielding case that basket all forms by black steel sheet of the present invention.
The method of the surface roughness characteristics of the plating Zn-Ni steel plate after handling as control enforcement melanism of the present invention, can use the surfaceness of the cold-rolled steel sheet that adjustment uses as raw sheet method, adjust the surfaceness of the steel plate behind the plating Zn-Ni method, adjust the method etc. of the surfaceness of the steel plate after melanism is handled.Method as the surfaceness of adjusting the cold-rolled steel sheet that uses as raw sheet, the roller that can use the tandem of raw sheet is rolling or skin-pass is as with spraying the roller that processing method, electrodischarge machining(E.D.M.) method, laser processing method, etch and other surface working method are implemented passivation processing, thereby carries out the method etc. of the rolling or skin-pass of tandem.In addition, also can use raw sheet is carried out method for processing with the direct injection processing method.
That is, when when electroplating manufactured plating of the present invention Zn-Ni layer, the coating that makes surface of steel plate is roughly along the concavo-convex formation of surface of steel plate.In addition, when carrying out melanism with electrolysis treatment such as anodic oxidations when handling, the melanism processing layer that also makes surface of steel plate is roughly along the concavo-convex formation of surface of steel plate.Therefore, preferably undertaken through the surfaceness adjustment of the plating Zn-Ni steel plate after the melanism processing by the method for the steel plate roughness before these layers of control formation.
And, as adjusting behind the plating Zn-Ni layer and the method for the surfaceness of the steel plate of melanism after handling, can use the method for carrying out skin-pass with the skin-pass roller of having adjusted roughness.
At this moment, even the roughness pattern skin-pass of skin-pass roller can not 100% directly is transferred on the steel plate, be that about 40～50% value of roller face value is transferred to the steel plate side with the Ra value, be that about 80% value of roller face value is transferred to the steel plate side with the PPI value.Therefore, in order to obtain having arithmetic average roughness Ra is the plating Zn-Ni steel plate that the peak number PPI of 0.7～2.0 μ m, per inch handles in the process melanism of the surface roughness characteristics more than 180, and preferably making Ra as the surfaceness of skin-pass roller is that 1.4～5.0 μ m, PPI are more than 220.
And electromagnetic wave shielding performance of the present invention is estimated by using device shown in Figure 2 to measure leakage noise.
In the profile of being made by the aluminium sheet of thickness of slab 2mm is in the aluminum basket 3 of 100mm * 100mm * 100mm, is provided as the clock 4 of the 20MHz of emissive source.The top of aluminum basket 3 is 80mm * 80mm open state, draws the frame 5 of 10mm to the inside, and the pad (with the reel object of the conductive fabric fiber of copper and mickel (plating) of polyurethane sponge) 6 of 10mm * 1mm is set on frame 5.Downcut 100mm * 100mm for examination material 1, with evaluation face 2 be below, it is contacted with the top pad 6 that is arranged on aluminum basket 3.And to apply the loading of 19.6N (2kgf) with vertical direction for examination material 1.Like this, the hertzian wave that leaks out from pad 6 and the architrave shape junction surface that contacts for examination material 1, the tours antenna 7 that by diameter is 30mm is receiving with the position of frame 5 at a distance of 50mm, after prime amplifier 8 amplifications with 25dB, (R3162 that ア De バ Application テ ス ト Co., Ltd. makes) analyzes with spectrum analyzer.
In addition, the electromagnetic wave shielding performance during as the basket material is estimated by the basket of making as shown in Figure 3 with the present invention.
The tower computer housing of the ATX specification of common commercial (OWL-PCR7 that オ ウ Le テ Star Network is made) is with housing parts 10 and the lid 11 of making basket for the examination material.In above-mentioned cabinet, assemble the parts of following specification, make desktop personal computer, the WindowsXP as OS is installed, start.
Power supply: the subsidiary product that directly use cabinet
Mainboard: A-Open company makes AX4SG MaxII
CPU: Intel company makes Pentium4 treater 3GHz
DDR internal memory: ノ one Block ラ Application De 250MB * 2
HDD: IBM Corporation of Hitachi makes HDS722516VLAT80 (capacity 160GB)
CD-ROM drive: パ イ オ ニ ア makes DVR-A08-J
Embodiment
Form or annealed cold-rolled steel sheet → injection processing operation that (surfaceness adjustment) → electroplating Zn-Ni → anodic oxidation (melanism processing) → coating forms according to annealed cold-rolled steel sheet → skin-pass (surfaceness adjustment) → electroplating Zn-Ni → anodic oxidation (melanism processing) → coating, change thickness, Ra, PPI after the melanism processing and the adhesion amount of coating of melanism processing layer, supplying shown in No.1～13 tried material in the manufacturing table 1.And the thickness of handling the plating Zn-Ni layer that forms by electroplating Zn-Ni is 2 μ m.In addition, the thickness of melanism processing layer is adjusted by electrolysis time and the pH that changes anodic oxidation treatment.
Added the coating composition of metal ion, water-soluble organic resin, water dispersible organic resin, glycoluril resin and acid with the scraping strip coating machine coating after, with oven heat so that the plate temperature after 21 seconds reaches 190 ℃, dry then, sclerosis are with its adhesion amount as the coating regulation.
As shown in table 1 to each the surface roughness characteristics that obtains like this, result that thickness, coating adhesion amount, planar portions erosion resistance, appearance of black and the electromagnetic wave shielding performance of melanism processing layer are studied for the examination material.
The evaluation method of each characteristic is as follows.
＜surface roughness characteristics 〉
Try material for supplying after the melanism processing, front end radius-of-curvature with probe is the probe-type roughmeter (manufacturing of Tokyo Precision Co., Ltd) of 1 μ m, under the sweep velocity of 0.3mm/s, the cutoff that makes the arithmetic average roughness Ra that stipulates among the JIS B 0601-1994 is that the peak number PPI of 0.8mm and per inch measures greater than 0.635 μ m.
The thickness of＜melanism processing layer 〉
The thickness of the melanism processing layer of visual field central parts is measured with 90,000 times multiplying powers in the cross section for the examination material after handling with the transmission electron microscope observation melanism, obtains the mean value in 4 visuals field.
＜coating adhesion amount 〉
To be converted into unit surface for the quality change of trying material before and after the coating formation and try to achieve.
＜planar portions erosion resistance 〉
After coating formed cut into 50mm * 100mm size for the examination material after, sealed section portion, carry out 48 hours salt-fog test according to neutral salt spray test (JIS Z 2371-2000) after, measure the area occupation ratio that produces white rust, estimate according to following standard.
◎: below 5%
Zero: greater than 5%, below 10%
△: greater than 10%, below 20%
*: greater than 20%
＜appearance of black 〉
Tone (L after measuring coating and form with beam split colour-difference meter (SQ2000, Japanese electric look Co., Ltd. makes) for the examination material
*Value), estimate according to following standard.
Zero: L
*Value is below 25
*: L
*Value is greater than 25
＜electromagnetic wave shielding performance 〉
Relevant electromagnetic wave shielding performance uses device shown in Figure 2 to measure from for the evaluation face of examination material and the noise of the junction surface leakage of basket with spectrum analyzer, obtains the figure shown in Fig. 4～7.
The evaluation of example and comparative example is as follows: every 20Mhz reads a peak value from frequency 20Mhz to 1000Mhz, and the value that will convert with following formula (2) is as noise rating number(NRN (I).
I＝10×log(10
0.1d1+10
0.1d2+…+10
0.1dn) (2)
N: peak number
D1, d2 ... dn: peak value
As judgement criteria, consider that from the interface of basket or the excellent in electromagnetic wave shielding property at junction surface the mensuration when trying material with the plating Zn-Ni steel plate (reference example) that does not have coating as confession is for example shown in Figure 4, the mensuration of example 7 is for example shown in Figure 5.In addition, at the example that does not supply to measure under the state of examination material as shown in Figure 6, at the example of not launching the output hertzian wave and supplying to measure under the state of examination material as shown in Figure 7.Fig. 7 represents extraneous noise.Here, the peak value substitution following formula (2) that will read from Fig. 4～7 is I with the result who calculates.And, because the peak of add * locating in Fig. 4～7 is from extraneous noise shown in Figure 7, so outside the object of following formula (2).
Confession examination material for example, when respectively with measure noise rating number(NRN that leakage noise obtains be I, with by Fig. 6 (for the examination material, hertzian wave output is arranged) noise rating number(NRN that obtains be Ia, with by Fig. 7 (for the examination material, do not have hertzian wave output) when the noise rating number(NRN that obtains is Ib, estimate with following standard
(I-Ib)/(Ia-Ib)＞0.35 o'clock be *,
0.35 〉=(I-Ib)/(Ia-Ib)＞0.26 o'clock be △,
0.26 〉=(I-Ib)/(Ia-Ib)＞0.20 o'clock be zero,
0.20 〉=o'clock be zero (I-Ib)/(Ia-Ib)＞0.13
+,
0.13 〉=o'clock be ◎ (I-Ib)/(Ia-Ib) 〉=0.
Table 1
| For examination material NO. | Ra(x) (μm) | PPI (y) | (1) value of formula | The thickness of melanism processing layer (μ m) | Coating adhesion amount (z) (g/m 2) | The planar portions erosion resistance | Appearance of black | Electromagnetic wave shielding | Appendix | |
| 1 | 1.0 | 205 | 1.6 | 0.15 | 0.6 | ○ | ○ | ◎ | Example 1 | |
| 2 | 1.0 | 205 | 1.6 | 0.07 | 1.3 | ◎ | ○ | ◎ | Example 2 | |
| 3 | 1.0 | 205 | 1.6 | 0.3 | 1.3 | ◎ | ○ | ◎ | Example 3 | |
| 4 | 0.9 | 380 | 1.7 | 0.15 | 1.3 | ◎ | ○ | ◎ | Example 4 | |
| 5 | 1.0 | 180 | 1.5 | 0.15 | 1.3 | ◎ | ○ | ○ + | Example 5 | |
| 6 | 1.3 | 205 | 1.9 | 0.15 | 1.3 | ◎ | ○ | ◎ | Example 6 | |
| 7 | 1.3 | 260 | 2.2 | 0.15 | 1.3 | ◎ | ○ | ◎ | Example 7 | |
| 8 | 1.3 | 380 | 2.8 | 0.15 | 1.4 | ◎ | ○ | ◎ | Example 8 | |
| 9 | 1.8 | 380 | 4.2 | 0.15 | 1.5 | ◎ | ○ | ◎ | Example 9 | |
| 10 | 1.8 | 380 | 4.2 | 0.15 | 3.0 | ◎ | ○ | ◎ | Example 10 | |
| 11 | 1.0 | 205 | 1.6 | 0.15 | 1.8 | ◎ | ○ | ○ | Example 11 | |
| 12 | 1.3 | 380 | 2.8 | 0.15 | 3.0 | ◎ | ○ | ○ | Example 12 | |
| 13 | 1.0 | 120 | 1.4 | 0.15 | 1.3 | ○ | ○ | △ | Comparative example 1 | |
| 14 | 1.3 | 150 | 1.6 | 0.15 | 1.3 | ◎ | ○ | △ | Comparative example 2 | |
| 15 | 1.3 | 205 | 1.9 | 1.1 | 1.3 | ◎ | ○ | × | Comparative example 3 | |
| 16 | 1.0 | 205 | 1.6 | 0 | 0 | - | - | ◎ | Reference example |
As shown in Table 1, according to the present invention, the thickness of melanism processing layer adjusted to 0.01～1.0 μ m and adjust arithmetic average roughness Ra to the 0.7～2.0 μ m after melanism is handled, above any one of peak number PPI to 180 of per inch all can not only obtain good appearance of black and erosion resistance, and can access good electromagnetic wave shielding performance.
Particularly when the adhesion amount (z) of the peak number PPI of arithmetic average roughness Ra (x), per inch (y), each face of coating satisfies concerning of above-mentioned (1) formula, can obtain good especially electromagnetic wave shielding performance.
With shown in the table 1 various for the examination materials (No.5, No.6, No.8, No.13, No.15) be used for tower computer housing shown in Figure 3 shell 10, the lid 11 o'clock, as shown in table 2 to the result that electromagnetic wave shielding performance is studied.
And the evaluation method of the electromagnetic wave shielding performance of tower computer housing is as follows.
The electromagnetic wave shielding performance of＜electronics, motor product 〉
Use for the examination material and make the electronics of basket, the electromagnetic wave shielding performance of motor product, make the technological standard V-3/2005.04 of VCCI (the autonomous regulation consultation of wave interference such as Japanimation treatment unit), 4.3 the distance of the mensuration shown in the notes 2 of the table 4.6 of the permissible value of interference wave strength of electric field is 3m, in open testing ground, measure, with whether satisfy rank B judge whether qualified.
Zero: satisfy rank B
*: do not satisfy rank B
Table 2
| Basket NO. | Shell | Lid | Electromagnetic wave shielding | Appendix | |
| 1 | No.5 | No.6 | ○ | Example 13 | |
| 2 | No.6 | No.6 | ○ | Example 14 | |
| 3 | No.8 | No.6 | ○ | Example 15 | |
| 4 | No.13 | No.6 | × | Comparative example 4 | |
| 5 | No.15 | No.6 | × | Comparative example 5 |
As shown in table 2, when the shell of basket and lid also use black steel sheet of the present invention (basket No.1～3), the electromagnetic wave shielding performance of the basket that can attain full and complete satisfaction.
Claims (5)
1. the black steel sheet of an excellent in electromagnetic wave shielding property, it is characterized in that, on the surface of plating Zn-Ni steel plate, have in the black steel sheet of coating with melanism processing layer, the thickness of this melanism processing layer is 0.01～1.0 μ m, and the surfaceness with plating Zn-Ni steel plate of this melanism processing layer is that the peak number PPI of 0.7～2.0 μ m and per inch is more than 180 with arithmetic average roughness Ra.
2. the black steel sheet of excellent in electromagnetic wave shielding property according to claim 1 is characterized in that, the peak number PPI of per inch is 200～400.
3. the black steel sheet of excellent in electromagnetic wave shielding property according to claim 1 and 2 is characterized in that, is that the peak number PPI of x (μ m), per inch is that the adhesion amount of y, each face of coating is z (g/m when making with arithmetic average roughness Ra
2) time, x, y, z satisfy following formula (1),
z≤(0.010x-0.0077)y-1.05x+2.16 (1)。
4. an electromagnetic wave shielding member is characterized in that, all or part of of parts uses each described black steel sheet in the claim 1～3.
5. an electromagnetic wave shielding case is characterized in that, basket uses each described black steel sheet formation in the claim 1～3.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004252663 | 2004-08-31 | ||
| JP252663/2004 | 2004-08-31 | ||
| JP046694/2005 | 2005-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101010450A true CN101010450A (en) | 2007-08-01 |
Family
ID=38698103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580029102 Pending CN101010450A (en) | 2004-08-31 | 2005-08-24 | Black steel sheet excellent in electromagnetic wave shielding property, electromagnetic wave shielding member and electromagnetic wave shielding case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101010450A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274495B (en) * | 2007-03-30 | 2012-05-23 | 株式会社神户制钢所 | Resin-coated metal plate with excellent conductivity |
| CN101878325B (en) * | 2007-11-28 | 2012-07-18 | 杰富意钢铁株式会社 | Steel sheet for fuel tanks and process for manufacturing the sheet |
| CN105112982A (en) * | 2015-07-27 | 2015-12-02 | 电子科技大学 | Magnetic hole substrate for preparing flaky electromagnetic noise suppression material |
| CN106460219A (en) * | 2014-05-30 | 2017-02-22 | Ｊｘ金属株式会社 | Metal foil for electromagnetic wave shielding, electromagnetic wave shielding member, and shielded cable |
| CN107018648A (en) * | 2017-06-02 | 2017-08-04 | 深圳天珑无线科技有限公司 | Radome and preparation method thereof, electronic installation |
-
2005
- 2005-08-24 CN CN 200580029102 patent/CN101010450A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101274495B (en) * | 2007-03-30 | 2012-05-23 | 株式会社神户制钢所 | Resin-coated metal plate with excellent conductivity |
| CN101878325B (en) * | 2007-11-28 | 2012-07-18 | 杰富意钢铁株式会社 | Steel sheet for fuel tanks and process for manufacturing the sheet |
| CN106460219A (en) * | 2014-05-30 | 2017-02-22 | Ｊｘ金属株式会社 | Metal foil for electromagnetic wave shielding, electromagnetic wave shielding member, and shielded cable |
| CN106460219B (en) * | 2014-05-30 | 2019-11-19 | Ｊｘ金属株式会社 | Electromagnetic wave shielding metal foil, electromagnetic shielding material and shielded cable |
| CN105112982A (en) * | 2015-07-27 | 2015-12-02 | 电子科技大学 | Magnetic hole substrate for preparing flaky electromagnetic noise suppression material |
| CN105112982B (en) * | 2015-07-27 | 2017-09-26 | 电子科技大学 | A kind of magnetic hole substrate for being used to prepare sheet electromagnetic noise suppression material |
| CN107018648A (en) * | 2017-06-02 | 2017-08-04 | 深圳天珑无线科技有限公司 | Radome and preparation method thereof, electronic installation |
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