ECA EIA-364-53B-2000 TP-53B Nitric Acid Vapor Test Gold Finish Test Procedure for Electrical Connectors and Sockets.pdf

1、 EIA STANDARD TP-53B Nitric Acid Vapor Test, Gold Finish Test Procedure for Electrical Connectors and Sockets EIA-364-53B (Revision of EIA-364-53A) May 2000 Electronic Components Industry Association ANSI/EIA-364-53B-2000 (R2016) Approved: March 3, 2000 Reaffirmed: April 7, 2016 EIA-364-53B NOTICE E

2、IA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the p

3、roper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of ECIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications p

4、reclude their voluntary use by those other than ECIA members, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by ECIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, ECIA does not ass

5、ume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This EIA standard is considered to have International Standardization implications, but the International Electrotechnical Commission activity has not progressed to the

6、point where a valid comparison between the EIA standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate sa

7、fety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. SP-4525 and reaffirmed by Standards Proposal No. 5368 formulated under the cognizance of the EIA CE-2.0 Committee on National Connector and Socket Standards). Published

8、 by ELECTRONIC COMPONENTS INDUSTRY ASSOCIATION 2016 Engineering Department 2214 Rock Hill Road, Suite 265 Herndon, VA 20170 PLEASE ! DONT VIOLATE THE LAW! This document is copyrighted by the ECIA and may not be reproduced without permission. Organizations may obtain permission to reproduce a limited

9、 number of copies through entering into a license agreement. For information, contact: IHS 15 Inverness Way East Englewood, CO 80112-5704 or call USA and Canada (1-877-413-5186), International (303-397-7956) iCONTENTSClause Page1 Introduction 11.1 Scope 11.2 Object . 11.3 Definitions 11.3.1 Measurem

10、ent area . 11.3.2 Corrosion product . 21.3.3 Corrosion product count . 22 Test resources . 32.1 Equipment 32.2 Material 42.3 Fixture 43 Test specimen . 43.1 Preparation . 43.2 Cleaning . 54 Test procedure 65 Details to be specified 76 Documentation . 7Table1 Corrosion product size . 32 Tines to be o

11、pened or removed 5iiCONTENTS (continued)Figure Page1 Corrosion product . 32 Line contact 83 Point contact . 84 Surface contact . 95 Round and square pin measurement area . 96 Multiple tine contact measurement area . 107 Multiple tine contact measurement area . 108 Hermaphroditic contact measurement

12、area 11AnnexA Informative notes A-1EIA-364-53BPage 1TEST PROCEDURE No. 53ANITRIC ACID VAPOR TEST, GOLD FINISH TEST PROCEDUREFORELECTRICAL CONNECTORS(From EIA Standards Proposal No. 4525, formulated under the cognizance of EIA CE-2.0Committee on National Connector Standards, and previously published

13、in EIA- 364-53A.)1 Introduction1.1 ScopeThis standard establishes test methods to determine the magnitude of porosity as well as othersurface defects inherent in application of gold contact finishes.1.2 ObjectIt is the intent that the defined method be used as an evaluation technique for the accepta

14、bility ofgold contact finishes. The method described herein has been selected on the basis of simplicity ofequipment, setup and operation. This procedure applies only to gold finishes with or withoutunderplates applied to copper or nickel base alloy contacts. This test procedure does not apply togol

15、d flash, equal to less than 0.25 micrometer (10 microinches), over palladium or palladiumalloy systems, see EIA-364-60.1.3 Definitions1.3.1 Measurement areaThe surface to be examined shall be defined as the measurement area. Unless otherwisespecified, the following definitions of measurement area ap

16、ply:1.3.1.1 Figure 2 portrays a “line“ contact. The measurement area is defined as 0.51 mm(0.020 in) on each side of the theoretical contact point tangent to point R and shall include thetotal width of the contact.1.3.1.2 Figure 3 portrays a “point“ contact as established by a dimple or elongated di

17、mple. Themeasurement area shall be defined in terms of the theoretical dimple contact zone plus 0.51 mm(0.020 in). The measurement area of an elongated dimple shall be defined in terms of itstheoretical contact zone length D and width W plus 0.51 mm (0.020 in) surrounding this surface.EIA-364-53BPag

18、e 21.3.1.3 Figure 4 portrays a “surface” contact. The measurement area shall include length D plus0.51 mm (0.020 in) at each end and the total width of the contact.1.3.1.4 Figure 5 portrays the measurement area of a round and square pin. The measurementarea shall be defined as equal to the maximum w

19、ipe distance plus 0.51 mm (0.020 in) with theinitial area starting at a point where the lead-in chamfer or radius blends into the shank of the pin.The measurement area shall include the total diameter of a round pin and all sides of a squarepin, unless otherwise specified.1.3.1.5 Figures 6 and 7 por

20、tray the measurement area of a multiple tine socket contact. Themeasurement area shall be defined as a region 0.51 mm (0.020 in) on both sides of thecircumferential line of contact.1.3.1.6 Figure 8 portrays the measurement area of a hermaphroditic contact mating coinedsurface. The area of measuremen

21、t shall be defined as the entire coined area plus 0.51 mm (0.020in) on all sides.1.3.2 Corrosion product1.3.2.1 A corrosion product is defined as being usually circular in shape and protruding from orlying upon the plated surface.1.3.2.2 The size of a corrosion product shall be defined by the major

22、diameter - the longeststraight line or chord that can be passed through the corrosion product.1.3.2.3 If blisters on the plating surface are observed as a result of the exposure, they shall becounted as a corrosion product as defined above.1.3.3 Corrosion product count1.3.3.1 A corrosion product sha

23、ll be measured and counted when at least 3/4 of the corrosionproduct falls within the specified measurement area; see figure 1.1.3.3.2 Corrosion products that originate outside the measurement area but fall within it and thatare irregular in shape shall not be counted; see figure 1.EIA-364-53BPage 3

24、To be counted Not to be counted if evidence of corrosionproducts exists on edges or if corrosionproducts are continuous outside of themeasurement zone.Figure 1 - Corrosion product1.3.3.3 Corrosion products, as defined in 1.3.2, shall be sized and counted in accordance withtable 1 when initially with

25、in the specified measurement areas.Table 1 - Corrosion product sizeCorrosion products size Assigned countDiameter 0.05 mm (0.002 in) 0 0.05 mm (0.002 in) 0.51 mm (0.020 in) diameter 1 0.51 mm (0.020 in) diameter 2Coverage in excess of 50% of measurement arearegardless of size201.3.3.4 The average co

26、rrosion count for a sample lot shall be determined by adding all of theassigned counts and dividing by the total number of measurement areas tested.2 Test resources2.1 Equipment2.1.1 Desiccator or sample chamber.2.1.2 The desiccator or sample chamber shall be constructed from inert materials, having

27、 thecapability of being sealed with an enclosed volume of 1 to 15 liters.EIA-364-53BPage 42.1.3 The size of the desiccator shall be such that no more than 164 cm3(10 in3) of airspace shallbe available per 6.5 cm2(1 in2) of nitric acid surface area.2.1.4 Sample holder as described in 2.32.1.5 Optical

28、 microscope capable of 10X magnification2.1.6 Collimated incandescent light source capable of an oblique angle 15 to 30 to themeasurement surface2.2 Material2.2.1 Concentrated reagent grade nitric acid: 70% 1% HNO3.2.2.2 Methanol, 2-propanol, or acetone2.2.3 Detergent: MicroTM, SparkleenTMor equival

29、ent2.3 FixtureContacts shall be placed in a suitable holding fixture of inert material, having the smallesthorizontal area necessary, and shall be held so as to maintain the measurement area in a verticalplane. The test fixture shall be constructed in such a manner to assure that the test samples sh

30、allnot be closer than 25 mm (1 in) from the wall of the desiccator and not closer that 76 mm (3 in)from the solution surface. Adjacent contacts shall not be closer than 10 mm (0.4 in) from eachother. The fixture shall not prohibit the measurement area from being exposed to the testenvironment. A mes

31、h support plate, if used, shall be constructed of nonabsorbing inert materialand cover no more than 50% of the cross-sectional area of the test chamber.3 Test specimen3.1 Preparation3.1.1 Prior to being inserted into the test chamber, contacts shall be prepared so that themeasurement areas may be ea

32、sily viewed through a microscope and exposed to the acid fumes.EIA-364-53BPage 53.1.2 Contacts shall be tested prior to assembly of shrouds, hoods, or other accessories. Duringthe preparation stage, care shall be taken not to touch or damage the measurement area.3.1.3 All socket contacts including t

33、ulip, box contacts and multiple tine contacts shall be openedto expose the measurement area; see figure 7. In case of multiple tine contacts, the number ofadjacent tines opened or removed shall be as shown in table 2.Table 2 - Tines to be opened or removedNumber of tines per contact Number of tines

34、to be openedor removed and disregarded21314252633.2 Cleaning3.2.1 Cleanliness is very important. Coatings or films on the contact may give false negatives byprotecting exposed base metals from the test reagents. False positive indications can also occurif plating salts or metal flakes are present an

35、d react with the reagents.3.2.2 Clean samples for 5 minutes in an ultrasonic cleaner or equivalent that contains a hot(65 C to 85 C) aqueous solution of a mildly alkaline (pH 7.5 to pH 10) detergent (such asMicroTMor SparkleenTM) or equivalent.NOTE If parts are straight off the plating line, one may

36、 use, instead of detergent, a 30second ultrasonic or equivalent degreasing in fresh, clean acetone, followeddirectly by 3.2.4 to remove traces of inorganic contaminants, such as platingsalts.3.2.3 After cleaning in accordance with 3.2.2, rinse samples thoroughly under warm running tapwater for at le

37、ast 15 seconds.3.2.4 Rinse samples in an ultrasonic cleaner or equivalent for 2 minutes in fresh deionized waterto remove the last detergent residues.3.2.5 Immerse samples in fresh methanol, 2-propanol, or acetone, and agitate ultrasonically orequivalent for at least 30 seconds in order to remove th

38、e water from the samples.EIA-364-53BPage 63.2.6 Remove and air dry samples until the chemical used in 3.2.5 has completely evaporated. Ifan air blast is used as an aid to drying, the air shall be oil free, clean and dry.3.2.7 Do not touch measurement area of samples after cleaning.3.2.8 After cleani

39、ng, samples shall be visually inspected under 10X magnification for evidenceof particulate matter remaining on the surface. If particulates remain on the surface, samplesshall be recleaned per 3.2.1 through 3.2.7.3.2.9 Contacts shall be placed in a suitable holding fixture; see 2.3.3.2.10 Materials

40、that absorb vapors (e.g., paper tags, string, tape, etc.) shall be removed from thesamples prior to cleaning and placing samples into the desiccator.4 Test procedureCAUTION -Perform all work in an exhaust hood since the vapors given off are toxic.Chemical goggles completely enclosing eyes shall be w

41、orn. Normalprecautions in handling corrosive acids should be observed. It isrecommended that the exhaust hood be of such a design as to minimizetransverse air currents to prevent purging of the desiccator of the acidfumes during the test.4.1 The desiccator and test samples shall be in an environment

42、 with a relative humidity less than60% and a temperature of 23 C 2 C (73 F 4 F) during desiccator equalization and duringinsertion and removal of the samples into the desiccator.4.2 Prior to each test, desiccators, sample chambers and other equipment shall be thoroughlycleaned and dried to remove an

43、y contaminant or residue remaining from past use.4.3 Place in the desiccator 50 ml to 100 ml of acid per liter of desiccator volume. Each test shallrequire fresh unused acid. If support plate is to be used, it shall also be placed in the desiccator atthis time.4.4 Allow the desiccator to stand for 3

44、0 minutes 5 minutes at 23 C 2 C (73 F 4 F)(closed desiccator).EIA-364-53BPage 74.5 Place fixture with samples on the inside rim of the desiccator and exposed for 75 minutes 5 minutes at 23 C 2 C (73 F 4 F). The lid shall be removed as briefly as possible wheninserting test samples.4.6 The fixture wi

45、th the contacts shall then be removed and immediately placed in an aircirculating oven for 10 minutes to 15 minutes at 125 C 5 C (257 F 9 F).4.7 The fixture shall be removed from the oven and allowed to cool to room ambient. Contactsshall be examined within 1 hour of exposure. Each measurement area

46、shall be examined forcorrosion products at 10X magnification. Proper illumination is critical in the examinationprocess. A recommended illumination technique is the use of a collimated incandescent lightsource at an oblique angle 15 to 30 to the measurement surface.5 Details to be specifiedThe follo

47、wing details shall be specified in the referencing document:5.1 Number of samples5.2 Average corrosion count allowed5.3 Measurement area6 DocumentationDocumentation shall contain the details specified in clause 5, with any exceptions, and thefollowing:6.1 Title of test6.2 Specimen description, inclu

48、ding fixturing if applicable (photographs may be used)6.3 Test equipment used, and date of last and next calibration6.4 Test and procedure6.5 Values and observations6.6 Name of operator and date of testEIA-364-53BPage 8NOTE - Or to the edge of the contact, whichever is less. First dimension shown is

49、 inmillimeters and the second dimension in ( ) is in inches.Figure 2 - Line contactNOTE - Or to the edge of contact, whichever is less. First dimension shown is in millimetersand the second dimension in ( ) is in inches.Figure 3 - Point contactEIA-364-53BPage 9NOTE - Or to the edge of the contact, whichever is less. First dimension shown is inmillimeters and the second dimension in ( ) is in inches.Figure 4 - Surface contactNOTE - First dimension shown is in millimeters and the second dimension in ( ) is in inches.Figure 5 - Round and square p