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1、 November 15, 2002 SUBJECT: Standards Proposal No. 4942, Proposed Revision of ANSI/EIA- 364- 60, TP- 60 “General Methods for Porosity Testing of Contact Finishes for Electrical Connectors and Sockets” (if approved, to be published as ANSI/EIA- 364- 60A, TP- 60A) BACKGROUND: At its November 6- 7, 200
2、2 meeting, the CE- 2.0 National Connector Standards Committee authorized circulation of the document for SP balloting and public review comment. SP- 4942 is herewith submitted to the CE- 2.0 membership for voting, and for ANSI public review and other interested parties for comment as steps towards s
3、tandardization. NOTE Please provide the following information whether voting or commenting via public review. Number each comment whether it is either editorial and/or technical. Company Name - Comment No. Type of Comment - Technical or Editorial Reference - Page No., Clause No., Line Suggested Chan
4、ge - Change From:. To:. Add:, Delete: Rationale for Technical Change FOR PURPOSE OF COMMITTEE VOTE: VOTING PERIOD EXPIRES JANUARY 15, 2003 FOR PURPOSE OF PUBLIC REVIEW: COMMENT PERIOD EXPIRES: JANUARY 15, 2003 Prior to this date, you may forward your comments to the designated EIA contact noted belo
5、w. Following the expiration of the comment period, this Standards Proposal will be submitted to the EIA Technology Strategy OR; 2. Fax your comments, prior to the deadline, to: 703 907 7549. Include this form with your signature Fax 703 907 7549; Email cyateseia.org COMMENT PERIOD EXPIRES: JANUARY 1
6、5, 2003 Each comment submission should indicate either: _ I am providing the attached technical comments concerning standardization of the contents of SP-4942 as an American National Standard, and recommend that the attached, along with the reason(s) for making the recommendation, be considered by t
7、he CE- 2.0 Committee. _ I am providing the attached editorial comments concerning standardization of the contents of SP-4942 as an American National Standard, and recommend that the attached, along with the reason(s) for making the recommendation, be considered by the CE- 2.0 Committee. DATE:_ NAME:
8、_ Please Print TEL:_ NAME:_ Signature E- MAIL_ COMPANY_ _ ADDRESS_ _ - ii Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networking permitted without license
9、 from IHS -,-,- Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE This document is an EIA Engineering
10、 Standards Proposal, rather than an interim or final Standard. It is published for purposes of comment and is subject to further review and modification by the EIA Engineering Department Executive Committee (EDEC), which may accept or reject the Standards Proposal. Accordingly, readers of this Stand
11、ards Proposal are cautioned against relying on information contained therein prior to the adoption of a final standard. EIA disclaims any liability or responsibility for the consequences of such reliance. Published by ELECTRONIC INDUSTRIES ALLIANCE 2002 Technology Strategy see Figure 8. In case of m
12、ultiple tine contacts. the number of adjacent tines opened or removed shall be as specified in Table 2. Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networ
13、king permitted without license from IHS -,-,- TP 60A 12nov02 DRAFT REVISION EIA SP- 4942, REV O 12 NOV 02 7 PRELIMINARY - Subject to Revision. Do not specify or claim conformance to this document. Table 2 - Multiple tine contacts Number of tines per contact Number of tines to be opened or removed an
14、d disregarded 2 1 3 1 4 2 5 2 6 3 NOTE Care should he taken to remove different tines from contact samples. This will avoid missing bad sections of tines. 3.2 Cleaning 3.2.1 Omit the cleaning steps for samples having corrosion- inhibiting or lubricating coatings, or both, if it is desirable to deter
15、mine the efficacy of the coating in the test exposure. 3.2.2 All peripheral hardware, housings and wires shall be removed prior to cleaning. Plated parts shall be removed from plastic housings whenever possible, prior to cleaning. Material that absorbs vapors (e.g., paper tags, string, tape) shall b
16、e removed from the samples prior to cleaning, taking care to maintain sample identity. 3.2.3 Keep individual contacts separated if there is a possibility of damage to measurement area during the various cleaning steps below. 3.2.4 Equipment for cleaning 3.2.4 1 Ultrasonic cleaning apparatus, prefera
17、bly with an integrated heater 3.2.4 2 Tongs or forceps 3.2.4.3 Air, oil free, clean and dry (optional) 3.2.5 Materials for cleaning 3.2.5.1 Acetone, Optima grade 3.2.5.2 Detergent, Sparkleen or Micro or equivalent 3.2.5.3 Methanol, AR grade 3.2.5.4 2- propanol, 99.0% Min, certified ACS grade Copyrig
18、ht Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networking permitted without license from IHS -,-,- DRAFT REVISION EIA SP- 4942, REV O TP 60A 12nov02 12 NOV 02 8 PRE
19、LIMINARY - Subject to Revision. Do not specify or claim conformance to this document. 3.2.5.5 Distilled or deionized water 3.2.6 Cleaning Procedure 3.2.6.1 Clean samples for 5 minutes in an ultrasonic cleaner which contains a hot (65 - 85 C (149 - 183 F) aqueous solution of a mildly alkaline (pH 7.5
20、 10) detergent. NOTE If parts are straight off the plating line, one may use, instead of detergent, a 30 second ultrasonic degreasing in fresh, clean acetone followed directly by 3.2.5.3 to remove traces of inorganic contaminants, such as plating salts. 3.2.6.2 After ultrasonic cleaning, rinse sampl
21、es thoroughly under warm running tap water for at least 15 seconds. 3.2.6.3 Rinse samples ultrasonically for 2 minutes in fresh deionized water to remove the last detergent residues. 3.2.6.4 Immerse samples in fresh methanol, 2- propanol or acetone, and ultrasonically agitate for at least 30 seconds
22、 in order to remove the water from the samples. 3.2.6.5 Remove and air dry samples until the alcohol has completely evaporated. If an air blast is used as an aid to drying, the air shall be oil free, clean and dry. 3.2 6.6 Do not touch measurement area of samples with bare fingers after cleaning. 3.
23、2 6.7 After cleaning, samples shall be visually inspected under 10X magnification for evidence of particulate matter on the surface. If particulates remain on the surface, samples shall be recleaned per 3.2.6.1 through 3.2.6.5. 3.3 Masking of exposed basis metal is necessary for some tests prior to
24、porosity testing 3.3.1 For the nitric acid vapor test method remove or mask as much exposed non- noble metal as possible. Platers tape may be used or apply stop- off lacquer using a microscope and a fine artists brush. 3.3.2 For the electrographic gel bulk test method mask a minimal amount of non- n
25、oble metal using a microscope and a fine artists brush as necessary. Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networking permitted without license from
26、 IHS -,-,- TP 60A 12nov02 DRAFT REVISION EIA SP- 4942, REV O 12 NOV 02 9 PRELIMINARY - Subject to Revision. Do not specify or claim conformance to this document. 4 Test procedure 4.1 Porosity test methods 4.1.1 Method 1, nitric acid vapor RECOMMENDED APPLICATIONS: gold or gold alloys. Valid for gold
27、 or gold alloy (75% or more of gold) surfaces of 0.76 micrometer (30 microinches) thickness or greater applied to the nickel or nickel base alloy contacts. This method not valid for underplates that are inert to nitric acid vapors (e.g., 65- 35 tin nickel). This method shall not be used for less nob
28、le platings like palladium or palladium- nickel alloys. CAUTION Perform all work in an exhaust hood since the vapors given off are toxic. Chemical goggles completely enclosing eyes shall be worn. Normal precautions in handling corrosive acids should be observed. It is recommended that the exhaust ho
29、od be of such a design as to minimize transverse air currents to prevent purging of the desiccator of the acid fumes during the test. 4.1.1.1 Prior to each test, desiccators, sample chambers and other equipment shall be thoroughly cleaned and dried to remove any contaminant or residue remaining from
30、 past use. 4.1.1.2 The desiccator and test samples shall be in an environment with a relative humidity less than 60% and a temperature of 23 C 2 C (73 F 4 F) during desiccator equalization and during insertion and removal of the samples into the desiccator. If the humidity is greater than 60%, the t
31、est shall not be run. 4.1.1.3 Add 500 ml of fresh, (see paragraph 4.1.1.8), concentrated nitric acid to the bottom of the dry, 250 mm inside diameter desiccator. For other size desiccator calculate appropriate amounts per paragraph 2.1.1.1.2. Be careful not to splash. Wipe droplets off the sides wit
32、h a clean dry lint free towel. 4.1.1.4 Allow the desiccator to stand for 30 minutes 5 minutes at 23 C 2 C (73 F 4 F) (closed desiccator). Protect desiccator from drafts, cover desiccator or turn hood fan off. 4.1.1.5 Contacts shall then be placed in the desiccator with support plate and/or fixture w
33、ith samples on the inside rim of the desiccator. The lid shall be removed as briefly as possible when inserting test contacts. Keep samples 25 mm away from the walls and allow adequate space, between samples, for circulation of the acid vapor. Replace cover. 4.1.1.6 Start timing acid exposure. Durin
34、g exposure time desiccator shall not be opened or exposed to drafts and temperature variations, to prevent condensation on the inner walls. Samples shall be exposed for 75 minutes 5 minutes at 23 C 2 C (73 F 4 F), unless otherwise specified. The nitric acid vapor exposure time if other than 75 minut
35、es is to be specified in the reference document. Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTNo reproduction or networking permitted without license from IHS -,-,- DRAFT REV
36、ISION EIA SP- 4942, REV O TP 60A 12nov02 12 NOV 02 10 PRELIMINARY - Subject to Revision. Do not specify or claim conformance to this document. NOTE Unless otherwise specified, the nitric acid may be reused within an 8 hour period, provided the desiccator has been maintained at the temperature and hu
37、midity specified in paragraph 4.1.1.2. Do not reuse acid if condensation appears on the inside of the desiccator or if a yellow- brown vapor is present in the desiccator. 4.1.1.7 The fixture with the contacts shall then be removed and immediately placed in an air circulating oven for 10 minutes to 1
38、5 minutes at 125 C 5 C (257 F 9 F). 4.1.1.8 The fixture shall be removed from the oven, placed in a desiccator containing Drierite. Allow to cool to room ambient temperature. Contacts shall be examined within 1 hour after removal from oven. 4.1.1.9 Calibrate reticle at a convenient magnification in
39、the 10X to 20X range before each examination using a stage micrometer or other device. Do not change magnification after calibration. Examine measurement area for corrosion products. Proper illumination is critical in the examination process. A recommended illumination technique is the use of a coll
40、imated incandescent light source at an oblique angle 15 to 30 to the measurement surface. 4.1.1.10 The presence of blue, green or bluish- white protrusions indicates that the coating is porous at those sites. Nickel corrosion products are often clear and difficult to see, particularly on rough surfa
41、ces. Tiny nickel corrosion products will often look like gold nodules. Blisters observed as a result of the exposure shall be counted as a corrosion product. 4.1.2 Method 2, sulfurous acid / sulfur dioxide RECOMMENDED APPLICATIONS: It is limited to gold, silver, tin, palladium, and palladium nickel
42、alloys with and without gold flash, where these metals comprise the topmost metallic layers of the finish system, and where the precious metal thickness is at least 0.38 micrometer (15 microinches). CAUTION 1. Do not grease the surface of the desiccator cover. To minimize any tendency for the cover
43、to stick, press a minimum of three strips of pressure sensitive Teflon tape (adhesive side down) at equal intervals around the rim of the desiccator. 2. Perform all work in a hood since the vapors given off are extremely irritating. Chemical goggles or face shield, protective clothing and gloves sha
44、ll be worn. Eye wash facilities shall be readily available. Place samples, fixtures, and acid desiccator under an exhaust hood. Copyright Electronic Industries Alliance Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 20:50:03 MDTN
45、o reproduction or networking permitted without license from IHS -,-,- TP 60A 12nov02 DRAFT REVISION EIA SP- 4942, REV O 12 NOV 02 11 PRELIMINARY - Subject to Revision. Do not specify or claim conformance to this document. 4.1.2.1 Add entire contents of a previously unopened 500 milliliter bottle of
46、sulfurous acid to the bottom of the dry, 250 mm inside diameter desiccator. Wipe droplets off the sides with a clean dry lint free towel. Be careful not to splash. For other size desiccator calculate appropriate amounts per paragraph 2.1.1.1.2. The sulfurous acid shall be used for only one test. Con
47、sult an environmental engineer for proper disposal of the sulfurous acid. The test shall be performed at a temperature of 23 C 2 C (73 F 4 F) and a maximum ambient room relative humidity of 60 percent. If the humidity is greater than 60 percent the test shall not be run. 4.1.2.2 Immediately place support plate and/or fixture with samples on the inside rim of the desiccator and immediately replace cover to prevent loss of vapor. Keep samples 25 mm away from walls and allow adequate space between samples for circulation of sulfur dioxide vapor (evolv
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