Metallic coatings-Test methods for electrodeposited silver and silver alloy coatings. Part 3: Determination of the presence of residual salts

This standard specifies the test method for the protection of engineering, decorative and protective silver and silver alloy electroplated coatings from residual salt contamination. This standard applies to metal parts; it does not apply to composite parts, such as parts with both plastic and plated metal. GB/T 12307.3-1997 Test methods for electroplated silver and silver alloy coatings on metallic coatings Part 3: Determination of residual salts GB/T12307.3-1997 Standard download decompression password: www.bzxz.net
This standard specifies the test method for the protection of engineering, decorative and protective silver and silver alloy electroplated coatings from residual salt contamination. This standard applies to metal parts; it does not apply to composite parts, such as parts with both plastic and plated metal.

GB/T 12307.3—1997
-Test methods for silver and silver alloy bonding layers-Part 3 This standard is formulated based on ISO4522-3:1988 Determination of salt retention in metallic coatings. It is equivalent to the international standard in terms of technical content and is basically equivalent to it in terms of code and rules. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coatings. The drafting unit of this standard is Wuhan Institute of Materials Protection, Ministry of Machinery Industry. The main drafters of this standard are Jiang Xinhua,
:comGB/T 12307.3—1997
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standardization bodies (ISU member bodies). The work of formulating international standards is generally carried out through various technical committees of [S0]. Each member body has the right to make representations to the committee if it is interested in a subject determined by a technical committee. International organizations, both governmental and non-governmental, in liaison with ISO may also participate in the work. In all aspects of international electrotechnical standardization, ISO works closely with the International Electrotechnical Commission (IEC): Draft international standards prepared by technical committees are sent to member bodies for approval before being adopted as international standards by the ISO Council. According to ISO procedures, at least 75% of the member bodies participating in the vote are considered to be adopted. International Standard ISO 4522-3 was prepared by ISO0/TC 107 Technical Committee Metallic and other inorganic coatings. Users should note that all international standards are subject to revision. Unless otherwise stated, the other international standards referenced here are the latest versions. ISC4522 consists of the following parts, with the general title "Gold and silver coatings - Test methods for electroplated coatings of silver and silver alloys": Part 1: Measurement of coating thickness; Part 2: Adhesion strength test; Part 3: Determination of residual salts. bZxz.net
1 Scope
National Standard of the People's Republic of China
Metallic coatings
Test methods for electroplated silver and silver alloy coatingsPart 3:Determination of the presence of residual saltsGB/T12307.3—1997
eq0 4522-3:1988
This standard specifies the test method for the protection of electroplated silver and silver alloy coatings for engineering, decoration and protection from residual salt contamination. This standard is applicable to metal parts, not to composite parts, such as parts with both coating material and sheath metal. 2 Principle
Boil the parts in water of known conductivity for a specified time, and measure the increase in conductivity of the dust produced by the precipitation of residual salts and other conductive impurities.
3 Reagents
Water: conductivity not greater than 100μS/m at 20℃±1℃. 4 Instruments
All glass instruments used shall be made of borosilicate glass, must meet the cleanliness requirements specified in 5.2, and be kept separately for this test.
4.1 Round flask: capacity of 250mL, equipped with a water reflux condenser 4.2 Beaker: size should be suitable for the part to be tested, marked with 100ml scale, equipped with appropriate equipment to reduce excessive heat loss of water, such as a cooling water cover.
4.3 Conductivity meter
5 Test method
5.1 Test sample
Take: one or more parts covered with fully coated metal, with a total surface area of ​​about 30cm2, and test according to the provisions of 5.3.1 or 5.3.2 according to their size (see 5.3). Be sure to avoid external contamination of the sample. Wear clean gloves when touching the parts during the inspection. 5.2 Inspection of the cleanliness of the instrument
Before the test, add 100mL of water (see Chapter 3) to the test container (see 4.1 or 4.2), and then slowly boil it for 10 minutes under the specified test conditions (see 5.3.1 and 5.3.2). Cool the water to 20℃ ± 1℃. Use a conductivity meter (see 4.3) to measure its conductivity. State Administration of Quality Supervision, Inspection and Quarantine 1997-06-27 Approved 1998-01-01 Implementation
GB/T 12307.3—1997
If the measured value exceeds 100uS/m, use another 100ml of water and measure it again. If the measured value exceeds 100S/m again, replace it with a new container and test it again. The qualified glass instrument should be kept separately for this test. 5.3 Determination
5.3.1 Samples with a cross-sectional width or diameter less than 15 mm and a length not greater than 40 mm. After checking the cleanliness of the instrument (see 5.2), place the sample (see 5.1) in a round-bottom flask and add 100 mL of water (see Chapter 3). The conductivity of the water should have been determined immediately before the measurement. The water should completely submerge the test piece. Install a reflux condenser on the flask and slowly boil for 10 min. When the water cools to 20°C-11°C, measure its conductivity with a conductivity meter (see 4.3). Calculate the increase in conductivity as the measurement result. 5.3.2 Samples with a cross-sectional width or diameter greater than 15 mm and a length greater than 40 mm. Perform the test in the manner described in 5.3.1. Place the sample (see 5.1) in a beaker (see 4.2) to which water has been added to 100 mL. To prevent excessive evaporation of water during the measurement process, a cooling water cover can be used. If necessary, more water can be added (see Chapter 3) to make up for the water lost.
6 Test Report
The test report shall at least include the following contents: Reference to this standard;
Name or number of the test specimen:
Total surface area of ​​the test specimen, m
Name or model of the instrument used:
Abnormal phenomena observed during the test;
Explanation of any difference from the original method;
Test results and expression method;
Test date:
Name of the operator and the test laboratory.
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