Metallic coating—Determination of porosity in gold coatings on metal substrates—Nitric acid vapour test
Some standard content:
GB/T19351-2Q03/1S014647.2000 This standard is equivalent to TS ()14617:20) <Determination of the porosity of gold-coated layers on metal substrates - Acetic acid hot
steam or other test version>.
This standard is revised in accordance with the editorial requirements of CR/T1.1 for IS14647:
: - The foreword of TS14647 is cancelled, and the foreword of this standard is newly added; "this standard" is used instead of "international standard"; "this standard" is used as "international standard"; Chinese standards that adopt international standards are quoted. This standard is approved by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Surfaces, and the drafting unit of this standard is the Quality Supervision and Inspection Planning Center of Surface Products of Machinery Industry. The drafters of this standard are Yao Xinhua, Zhong Jingchang, and Ran Zhihao. H
GB/T19351.—2003/E50 14647.200C International Standard
The gold coating layer is used for the contacts of the separable gas contact parts and other parts. The contacts should be in the form of electrodeposited gold. The gold coating and soldering metal are also deep under the contact surface: the metal can prevent the formation of an oxide film that will affect the contact effect.
In order to ensure the inherent properties of the enterprise, the surface of the deposited layer should be treated with anti-corrosion treatment, otherwise the holes, cracks and other defects on the substrate and the bottom layer should be extremely small. The sufficient rate of the layer should also be taken from the strict separation of the layer or the method, so as to avoid tight contact. The design of the matching plan, the parameters of the road, the reliability of the problem must be maintained: if there is a support, the hole is also in the upper part of the surface, and the protection effect is very small, and it should be outside the matching surface before the fusion area, then it is recommended to abandon it. The methods used can specifically determine the properties and effectiveness of the hole. These methods are applicable to the contact surface, and the contact surface type is also different. If the surface is not a surface or a shape, these methods should be used for this situation. In addition, the severity of the test for determining the hole may be different. The test method specified in this standard can be considered as a product consulting method. Special test conditions should be determined by the user through actual test results and judgment of the most important test results. For example, The absence of obstructions in the housing can be a requirement for some applications, but for other applications the presence of a hole in the housing may be acceptable. Such a criterion for passing or not passing the product standard or requirement shall be fulfilled as part of the product porosity test. The test method described in this standard is of particular interest and can detect all holes or other defects in the metal layer without physical properties. It can also be used for geometric shapes such as pin-out contacts. In this case, the block shall be opened before testing to allow the surface to be mixed. The test method described in this standard is considered to be destructive and is generally considered to be effective only through the use of microbial contamination and slight drying. The test method described in this standard involves the removal of corrosion products in the presence of relatively low-intensity acid vapors. The gas mixture may produce a product in the presence of a substrate metal and the product may not be continuous in the presence of high-intensity acid vapors. The ...
This standard describes the test force for the determination of the actual porosity density, such as the porosity per unit area, or the number of holes per contact, and the measurement object is limited to those layers with sufficiently low porosity, and the test is easy to determine at a very low distance. As a general guide, for layers with a porosity density of 100 holes per meter or 100 contacts per meter, this method is the maximum porosity test that can be carried out: above this value, the method is suitable for qualitative inspection and comparison of porosity. F
GB/T I93512003/ISO 14647:2000 Gold coatings Determination of the porosity of gold coatings on metal substrates Nitric acid vapour test
Warning: This standard does not claim all safety precautions associated with its use. If these problems exist, the user of this standard has the responsibility to establish relevant safety and health measures before using this standard and to determine the applicability of regulatory restrictions. Special precautions are given in 6 and 7.4. 2.
1 Scope
This standard specifies equipment and methods for the determination of the porosity of gold covering layers, especially inner and outer layers of electric vessels, by nitric acid vapor hot stamping.
This method is intended to indicate whether the porosity is less than or greater than that proposed by the user based on experience, and only describes the objects to be subjected to some bias
This standard is intended for gold-containing and active layers or gold-containing layers, although the current accumulation of 95% of the gold content is often used in electrical contacts, and the formation of metal layers,
The steam test is too strong: it is suitable for gold layers with a thickness of Um: for layers with a thickness greater than that of gold and platinum, such as targets and their alloys of ferrite or flash gold. Other test methods (positive/T:7720 and clauses (negative, such as, reference documents or [door and) 2 Normative references || tt || The clauses in the following documents become clauses of this standard through reference to the relevant standards. The applicable text of the month and all subsequent amendments (excluding active identification spaces) are not applicable to this standard. However, it is encouraged to report to the relevant parties whether the new version of the document can be used. For any un-dated applicable text, the latest version shall apply to this standard. T/T38 Metal Chemistry and Related Test Techniques (Refer to IS207! and TSO28 0: B/T233/-2001 Metallic and other non-organic materials - Definitions and general rules for quality control (IS02) 6419965
GB/T11/20 Gold temperature layer test evaluation (1%10508) 3 Definitions of terms
T313 Agent K123342001 The following technical definitions are applicable to this standard. 3.1
Erosion production errnsinnpronlur1s
Evaporation test After the test, the surface of the cover layer is exposed to the precipitation of the anti-substances. 3. 2
Main surface sigrifieanfsrac
BeiG5: T 12331—2G1 3.1, Let: The surface of the test part shall be measured by the machine or by raising the mark on the bridge or by proving that the mark has been old. 3. 3
Measurement surface meurinyare
See Gn/T12854-2313.2
GB/T19351-2003/1S04547.2000
Metallic coating
Present metallization layer
Present metallization layer, coating or other metallization layer on the base. Note: The product can be a combination of single metallization layer for the purpose of total metallization3.5
Positive shield
Present metallization layer can be used to remove any discontinuity, effect or luster of the base metal,3.6
Base coating Doderplate
Used for The metal flow accumulation layer between the single chamber or multiple layers. The thickness of the layer should be less than 0.m
4.1 The test chamber should be a glass container with a size of 120 mm and can be sealed with a cover. For example, the chamber should have a volume of 1200 VL. The ratio of the air space in the chamber (m3) to the surface area of the sample (m2) should not be greater than 2:1:4.2 The sample holder should be made of a support or a bottom made of a uniform, oxygen-friendly material or other materials. The design of the sample should ensure that the placement of the sample is not affected by the cycle of the sample. The surface of the sample should be less than 5 m. The flux surface of each sample should also be less than 2 mm.
Do not use porcelain or other structures that block the wave surface to ensure that the air and hot steam in the device are not restricted during the test.
4.3 Stereoscopic microscope
Pore counting should be in a position with a 10-fold control efficiency. In addition, a movable real-time illumination source that can be tilted to illuminate the sample can also be used.
4.4 Oven
The operating frequency can reach 3
4.5 Dry oven
Used to cool the test expansion:
5 Reagents
5.1 nitric acid evening
station agent level, book dimension is 6912) times, relative rate (20) is 2.39--1.42, 6 safety
in the chemical delay mist rejection test, let the main reason is: at the end of each test, open the container to verify the new gas absorption of its corrosion and set,
of course, it must be noted that the flow rate in the device mentioned in the safety guarantee plan exceeds the general product cold cutting device science, because the cold exhaust of the device will lead to the relative humidity and the speed test shows 73, the combination is usually done as much as possible, the reaction container is placed in a pen with a loose fitting cover,
when transporting acid, it is necessary to stimulate the positive belt to prevent the spread of travel: especially when the source of acid is transported, the safety account can completely protect the eye from abnormal surface rate, and make the eye of the lecture hall in the carving time. Usable state 2
7 Procedure
GB/T19351—2003/014647:2000
7.1 The sample should be handled without any unnecessary effort and can only contact the test group with the microscope, eyepiece and cloth, disinfectant or nylon hand plugs. In the test range, use a stereo microscope (4.3) to check the sample for any visible material. If there is any, use clean air to remove cloud particles, shake it, and then gently rinse it with a degrading agent or melt that does not contain chlorine (FLs), chlorinated hydrocarbons or other known cyclohexane compounds to thoroughly clean the sample from which the particles have been removed, and then dry it with clean air. Hot methanol, ethanol, ethanol or isocyanate are often used for analytical tests to increase the drying.
Note that there are large areas of the most protected non-SARS gold, which can be attributed to the sudden reduction of these areas; when the tape is acidic, be careful not to inhibit the movement of acid vapor to the source of the anesthetic.
7.2 The ambient temperature at the beginning of the test, the temperature of the sample is set to 23%, 3℃ and remain unchanged during the test. 7.3 The test solvent (4.1) should be in the range of 40% to 55%. It should not be allowed to drop below 4% or rise to more than 3%. If the RHC, the test is terminated.
7.4CcL new IIN(（5.1）under inactivation, the lower end of the tester seat, and the seal on the benefit, after 3mir±5mit, take the experience and the clamp (,2) put the sample, and change the new benefit. During the period of using IN), and putting the sample in, the environmental RIT is not higher than 6%, the maximum reference is between 40 and 5. 1[15C%. The gold product is subjected to a layer of hillock stimulation, the thickness of the water layer (1m) will be slightly increased near the sample []. Note: If dryness is used, the three edges of the device and its use cannot be used. The ring can be burned ten times and exploded at least three times. The four B marriage belt (including the unified side downward:
7.5 is the right side of the system. The time for steam drop is 60m-5min: the thickness of the metal is 2m--2.5m. The time for use is also usually 75ai 5min. The maximum time is enough. See Appendix A for each time of the push part. Note: The recommended exposure time varies with the thickness of the matter. , the fourth is relatively, the most different in the ritual courtyard [relatively and the 1 layer in the deeper, the lower the average size of the acid medium is, the longer the average pore opening time is than the average time required for penetration. If the time is too long, the peaks of the products will overlap, and the removal of the m melt will be damaged. For details on this effect, please refer to the author's book account 17.6. After the test, take the sample and put it in the oven (4.4) for less than 12 minutes to dry for 30 minutes, then After that, take the sample out of the oven and place it directly into the rack containing the active agent (4.5). Cool to room temperature. Note: In a safe and legal manner, store the sample in the desiccator until the inspection begins. Then, slowly open the desiccator to create an incomplete vacuum for the cooling process.
7.8 The inspection should be carried out within two hours after the sample is taken out of the oven. 7.9 Use parallel incandescent light to illuminate the sample. When the beam is inclined at an angle of 15, 10. When counting the pores, the erosion products that protrude from the pores will block the location of the pores. Because these solid erosion products are transparent in the metal or glass, special care should be taken, especially on the main surface or curved surface. 7. When less than one erosion product falls into the side area, it should be counted. In addition, the erosion products that originate outside the measurement area but extend into the measurement area and the irregularly shaped erosion products (see Figure 1) The corrosion product count is not counted. CB/T19351--2003/1S014647:20007.1 The chain layer on the bottom layer may appear bubbles, which may occur in the hole. It may be the dense product under the coating. Count these bubbles as pores. 12 It is recommended to take two readings for each measurement area and then take the average of the two readings. 7.13 Define the longest diameter of the product as the pore size. Products smaller than 100 mm cannot be distinguished at 10 times magnification. Even if they can be observed with high magnification, do not count them as pores. Note that if the product is to be listed, one size smaller than the other is to lose three sizes to make the original classification group list. The accuracy of this test method is being investigated using a metal cell head with a bottom layer. Four tests were carried out by three independent laboratories under the same rigorous conditions. The results obtained for each experiment showed a coefficient of variation of less than 20 (see the full text [4]. However, the results of the different laboratories were different. If the accuracy obtained by this comparison is different, the test report shall contain the following information: a) This standard is numbered GB/T1351: 1) Characteristics of the substrate and any intermediate layers; 2) Characteristics of the infill layer, also known as the filler layer or infill layer; 3) Composition of the components; 4) Relative sensitivity of the test container (see 7.3); 5) Relative sensitivity of the environment (see 7.4).
The time for test opening (see 7.)
) The results obtained. I-The number, location, color and size of pore corrosion products; ) The acceptable amount, location, color and size of pore corrosion products specified in the relevant product standards are attached
(Normative Appendix)
The time recorded in the nitric acid vapor exposure
GA/1:19351-2053/ISO14647.2700 The length of time for each product exposure to nitric acid vapor is appropriate, it is sufficient to produce natural products with a diameter greater than 0.0m, but it is sufficient to prevent these products from being significantly damaged. If the season is too short, the corrosion products of many holes may be too small and difficult to find; if the season is too long, the corrosion products will overlap or collect together, which will damage the energy of the parts where the gaps are located (see the second section of the test paper): Table A.1 helps to define the exposure time of the cover layer in the title. Table A.1 Gold cover layer exposure time
Gold degree /
0. 6~- 2. u
2, 0 -- 2, 5
440D: This length is m, hereby produced, seasonal dry production time: r1z
GR/T19351-2003/ES>14647:2Q00 Appendix B
(Normative time record.
Avoid the use of chlorinated hydrocarbons
It has been found that the use of particle sequence helps to avoid the use of chlorinated hydrocarbons:) If there is a possibility of damage to the test area during the cleaning process, separate the test pieces; in the entire ultrasonic cleaner with weak alkaline (H7.5~H10) decontamination prepared with hot (65%:~85)%% water solution b)
Clean the sample: min
Cultivate the sound and wash it After that, rinse the sample thoroughly in fresh deionized water for 2 hours, and then ultrasonically rinse the sample in fresh deionized water for 3 hours to remove the detergent residues. Prepare fresh test methyl ether and acetaldehyde, denature the sample in propylene glycol, and ultrasonically drive for at least 105 to remove the water on the sample. Then air dry the sample until the alcohol is completely evaporated. If compressed air is used to assist drying, ensure that the air is dried in a clean room. Do not touch the sample test surface with your fingers after washing. GB/T19351-2Q03/1SO12647:2300[1I NUBl.E:I, J. .OSTROW, Is, D. and I'HOMPSkON.J>, W, , Pnrosily 1esiing of go.d depos:1sPla..o].
[27 KRIJMEIN,Sj- pn:asily teetinR f alacl. nl-Jints, Pneliuz--tum ecinrs :d I:lrrnectian Tsekroigy Sytugosium.Uctober 1987.p. 47._3_ HOLIEN.C,A. and 1.tIK,R Critical nitric acia.vapar test pararveiers aice.ng :2 apparta p>rnsily uf -hin .ul seleulivily rlairil gld aluling:1982,6srNay)+y. l-3.[4 KRhiBEIN,S. j. and HOi.DEN, CA Ir. .Poravity :ezlim f melalile coalir.gi. In;IIAR-UlAG, W. E, and )KARi.G, A, eds. Nev Yotk ,AY,Macrtllen: 1966bZxz.net
?_ GI'TTMAN.H. art SFRAIA.PJ: VHlal .ost i the alUItr. ASTM STP Nd35. I'hi.adc.phia.PA, American Society tor Texling and n:1erials.: as7,pp. R2ri Hs.
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