Salt spray chamber operation manual Briquetting Press,Briquetting Machine,Aluminum Drillings Briquetting Press,Brass Chips Briquetting Machine DILOYA GROUP CO.,LTD. , https://www.diloyamachine.com
1. Purpose Purpose Aim To properly use the salt spray test chamber to check the corrosion resistance of the coating.
2. Scope of application Scope of application Scope of application Scope of application Salt spray tests can be carried out on electroplated parts and products according to customer requirements.
3. Responsibility Duties Duties and Responsibilities 3.1 The Quality Assurance Department is the centralized management department for inspection and testing of electroplating products;
3.2 The plating inspection personnel is responsible for the entire salt spray test of the plating product.
4. Operating Procedure Operating Procedure Operating Procedure Operating Procedure
4.1 Equipment: Salt spray testing machine JS-HY-SST-bo-01c certified to meet relevant standards
4.2 Preparation of salt spray test solution:
4.2.1. Modulation method: Pour 4.75 liters of purified water into a special plastic bucket. Test the pH of the sample with a pH tester between 6.5-7.2.
4.2.2. If the pH is less than 6.5, add a small amount of sodium hydroxide. If the pH is greater than 7.2, add a small amount of glacial acetic acid. 4.2.3. Add 250 g of NaCl and mix well.
4.3 Samples: 20 Specimens 4.4 Operating Procedures:
1. Open the water inlet valve drain valve and exhaust valve switch that automatically add water.
2. Fill the sink with water to the pad position.
3. Pour the prepared saline nacl into the brine replenishment tank, that is, automatically fill the brine into the preheating tank in the test chamber and allow the brine to flow into the brine preheating tank.
4. Add a little water in the wet bulb. The wet bulb temperature covers the gauze and the end of the gauze is placed in the wet bulb.
5. Before starting the test, the sample must be fully cleaned. The cleaning method depends on the surface conditions and the nature of the contaminants. It is not allowed to use any abrasive or solvent that will erode the surface of the sample. At the same time, the sample is cut and the substrate is exposed due to hooking. In some cases, or due to the identification marks caused by the plating defects, the application of transparent tape before the test will cover. Place the specimen or test piece on the rack. Place the specimen in the box so that the test specimen is at an angle of 15-30° from the vertical. The main surface of the specimen is upwards and the salt mist is in the box. The main direction of flow is parallel. When there are many main surfaces of special specimens that need to be tested at the same time, it is advisable to place multiple specimens. It is important that each main surface be tested for salt spray at the same time.
6. During the test, the specimens shall not contact with each other nor with the wall of the tank. The spacing between the specimens shall not be less than 20mm. The upper and lower layers of the specimen shall be placed crosswise. The interval between the specimens shall enable the salt mist to freely settle The main surface of the sample. A saline solution on one sample must not be dropped on any other sample. The sample identification mark or assembly hole should be covered below.
7. Set the test temperature, pressure and time: adjust the temperature of the brine tank and the test chamber to 35°C, and adjust the temperature of the pressure tank to 47°C (press "+" for increase, press "-" for decrease, H: hour / M: minutes/S: seconds). The pressure at the jet is maintained at 1.00±0.01kgf/cm2. If the pressure is not within the range, the pressure can be adjusted to the specified range using the pressure regulator (clockwise increase, counterclockwise decrease). The test time is generally 24 hours (press "△" for increase, press "▽" for reduction), if the customer has special requirements can be set separately, the test time can be generally set to 8,16,24,48,96, At 168, 336, and 672 hours, the spray must not be interrupted during the specified test period. The salt spray box can only be opened when the sample needs to be observed briefly. The time and number of open inspections should be as small as possible.
8. Press the power button and operate the two buttons to pre-heat the temperature to the set temperature. Pay attention to the cover of the test cap to be careful to avoid damage. 9. In the test, the salt mist settling for continuous atomization for 16 hours was collected using a funnel with an area of ​​80 cm2, and an average of 1.0-2.0 ml of solution per hour was collected. This can be obtained by observing the amount of fog falling in the measuring cylinder. The test time shall be deducted from the time of interruption of spraying due to the examination of the sample, and the reason and time for the interruption shall be recorded.
10. After the test is completed, turn the switch off in sequence. Take out the sample in the room for 0.5-1 hours of natural drying, and then gently wash or dip with cold flowing water to remove the salt deposited on the surface of the sample, blow dry after the hair dryer check, evaluate the test results. 11. If there is any abnormality in the test, refer to the "Functional abnormality judgment table" for handling. If there is a fault indication, it can be judged according to the "fault indication".
12. After the test is completed, clean the interior of the test and drain the water from the heated water tank. * Water discharge in the heating tank - Open the red drain valve * Isolate the water discharge in the sink - Pull up the middle tamper plug * Preheat water in the sink - Open the internal tamper plug 13. According to "Maintenance Matters "Maintenance of equipment.
14. Test conditions and test results must be recorded. Evaluation of test results:
a appearance after the test
b Appearance after removal of surface corrosion products
c Corrosion defects such as pitting, cracks, bubbles, etc. Distribution and quantity and status d Corrosion time
1. Rating principle:
(1) The part of the plating surface, which is important for the appearance or performance of the plating, is the appearance and protection rating of the main surface.
(2) The test results are recorded in two levels with (/), and the protection level is recorded first.
(3) In addition to recording the grade of the sample, the grade and severity of the defect should also be indicated.
2. Type of defects (1) Protection defects include pit corrosion, pinhole corrosion, blistering, corrosion products, and other defects in metal corrosion products.
(2 appearance defects, in addition to the defects caused by the substrate metal, also include all damage to the appearance of the sample. Typical defective oils; surface pitting, "chicken-like" defects, cracking, surface contamination and tarnish.
3. Rating of protection According to the area covered by the corrosion defect, the following calculation method is used to obtain the protection level R=3 (2-10g10A) where: R—protection level A—the percentage of the total area of ​​defects< according to the formula Derive the R value and round it to the nearest whole number, as shown in the table below. Defect area protection class No defect 10 ≤ 0.1 9 > 0.1-0.25 8 > 0.25-0.5 7 > 0.5-1.0 6 >1.0-2.5 5 >2.5-5 4 >5-10 3 >10-25 2 >25-50 1 >50 0 a For artificially non-defective specimens, it may be artificially graded as 10; b For specimens that are better than Class 9 but not complete and non-defective, if necessary, between 9 and 10 Scores are shown to distinguish them; c To assist in the assessment of defect area, refer to the attached table. 4. Appraisal of Appearance Ratings a. Appraisal of Appearance Ratings is related to many factors, and thus the appearance rating is not evaluated with the same accuracy as the protection rating. It is not only based on the area of ​​the defect, but also on the extent of the loss of the defect; b The appearance rating is based on the protection rating but cannot be higher than the protection rating. Because the corrosion of the base metal also damages the appearance; c When assessing, the damage of the coating appearance should be divided into: very slight/slight/medium/severe according to test requirements. According to the above classification, the following principles are used for assessment: * Appearance defects are minor, and their appearance levels are lower than the protection level by one or two levels, very low by one, and minor by two; * appearance defects are moderate, The appearance rating is lower than the protection rating by 3 or 4; * The appearance defect is serious, and the appearance rating is lower by 5 or more than the protection rating. National Standard: GB/T2423.17-93 Medium Salt Spray Test Standard (NSS) Basic Environmental Test Procedures for Electrical and Electronic Products Test Ka: Salt Spray Test Method
1 Purpose of the test This standard is used to evaluate the resistance to salt spray corrosion of materials and their protective layers, and the comparison of the process quality of similar protective layers. It can also be used to assess the resistance to salt spray corrosion of certain products.
2 Test equipment 2.1 The materials used to manufacture the test equipment must be resistant to salt spray corrosion and not affect the test results.
2.2 The conditions in the test equipment should be kept within the limits specified in Chapter 3 of this standard.
2.3 Salt spray shall not be directed onto the test sample.
2.4 The water droplets collected on the top and walls of the test equipment shall not drip on the test sample.
2.5 The pressure inside and outside the test equipment must be balanced.
3 test conditions
3.1 The salt solution is configured with nacl (above chemical purity) and distilled water at a concentration of 5 ± 0.1% by weight. The collected material after materialization shall not be reused except for the baffle-return part.
3.2 The pH of the salt solution before atomization is between 6.5 and 7.2 (35°C). When configuring the salt solution, it is allowed to use the dilute hydrochloric acid or sodium hydroxide aqueous solution above the chemical purity to adjust the pH, but the concentration must still comply with the provisions of Article 3.1.
3.4 Using a funnel with an area of ​​80 cm2 to collect the salt fog deposition amount continuously atomized for 16 h, the settlement rate at any position within the effective space is: 1.0-2.0 ml/h.80 cm2.
3.5 This standard uses continuous atomization, the recommended standard test time is 16, 24, 48, 96, 168, 336, 672h.
3.6 When atomizing, it is necessary to prevent oil, dust and other impurities and the temperature and humidity of the injected air from affecting the test conditions of the effective space. 4 Test Procedures 4.1 Initial Test Prior to the test, the test sample must be visually inspected and the performance of other items determined in accordance with the relevant standards. The sample surface must be clean, free of oil, temporary protective layers and other ills.
4.2 Conditional tests The test specimens shall not be in contact with each other. They shall be separated by a distance that does not affect the ability of the salt spray to freely land on the specimen, and that the salt solution on a test specimen shall not drip on other test specimens. The placement of the test sample is determined by the relevant standards, generally according to the state of use of the product and the material (including the cover, etc.); the flat test sample is required to make the test surface at an angle of 30° with the vertical direction. After the test sample is placed, the condition test shall be carried out according to the test conditions specified in Chapter 3. The test duration shall be selected from the provisions of Article 3.5 according to the relevant standards.
4.3 After the end of the recovery test, the salt deposits on the surface of the test sample are gently washed off with running water and rinsed in distilled water. The temperature of the wash water must not exceed 35°C, and then it should be restored in the standard recovery atmosphere for 1 to 2 hours, or according to relevant standards. Other recovery conditions and time specified.
4.4 Final test The recovered test sample shall be checked and recorded in a timely manner. The inspection items, evaluation of test results and qualification requirements shall be stipulated by relevant standards.
4.5 When using this test method, the following items should be specified:
a. Initial inspection b. Installation details c. Test duration d. Recovery e. Final inspection