The Environmental Test Methods For Oceanographic Instruments. Part 10: Salt Fog Test Drafted By ORT Was Authoritatively Released By The State Administration For Market Regulation
Environmental test methods for oceanographic instruments. Part 10: Salt fog test
Standard No.: GB/T 32065.10-2020
Focus unit: National Marine Standardization Technical Committee
Executive unit: National Marine Standardization Technical Committee
Competent authority: Ministry of Natural Resources (Marine)
This standard was published on November 19, 2020, and will be implemented on June 1, 2021.
The range of standards:
This standard specifies the test requirements, test process, and related information for the salt mist test of oceanographic instruments and components.
This standard is applicable to assess the salt mist corrosion resistance of oceanographic instruments and components and the influence of salt mist on the performance and functions of oceanographic instruments and components.
1. The test equipment is a combination of a salt mist test chamber and a damp heat test chamber
The test steps are as follows:
a) The test sample is placed or suspended on the test frame of the salt spray test box (chamber) in a non-working, non-powered state, and its largest surface should be upward and at an angle of 15° to 30° with the vertical direction; The test samples should not be in contact with each other, nor should they be in contact with other metals or water-absorbing materials; the distance between the test samples should be such that the salt spray can settle freely on all samples, and the salt solution on one test sample should not drip on any other samples. On the test sample;
b) Adjust the state of the salt spray test chamber (chamber) to meet the requirements of 3.3.2 and 3.3.3; the spraying phase lasts for 8 hours, and the sedimentation rate of the salt spray should be measured at least once during the period. Record the data in Table B.1; adjust the state of the damp heat test box (chamber) during spraying to meet the requirements of 3.3.2;
c) After the spraying phase is completed, transfer the test sample to the damp heat test box (chamber) for two stages The conversion time should be less than 30 min, and the conversion time is not included in the test time; the test time in the damp-heat phase is 16 h;
d) The above test step is a cycle, repeat steps a), b) and c) for the next cycle test. See 3.3.4 for the number of cycles;
e) After the test is over, first gently wash the test sample with tap water (except for the test sample with a metal protective layer) to remove salt; then rinse with distilled water and keep the temperature at (40±2) ℃ Dry in a drying box for 2 hours; then place it in standard atmospheric conditions to recover for 1 to 2 hours.
2. The test equipment is a composite salt mist test chamber
The test steps are as follows:
a) Place or suspend the test sample on the test frame of the composite salt spray test box (chamber) according to the state of use. The largest surface should be upward and form an angle of 15° to 30° with the vertical direction; test sample They should not be in contact with each other, nor should they be in contact with other metals or water-absorbing materials; the distance between the test samples should be such that the salt spray can settle freely on all samples, and the salt solution on one test sample should not drip on any other test samples ;
b) Set the parameters of the compound salt spray test chamber (chamber) so that the temperature and relative humidity of the spray phase, the damp heat phase and the sedimentation rate of the spray phase meet the requirements of 3.3.2 and 3.3.3 respectively, and each spray The sedimentation rate of the salt spray shall be measured at least once in the cycle, and the data shall be recorded in Table B.1; see 3.3.4 for the setting of the test cycle;
c) After the test is over, first gently wash the test sample (test sample of the metal protective layer) with tap water Except) to remove salt; then rinse with distilled water and dry in a drying oven at (40±2)°C for 2 h; then place it in standard atmospheric conditions to recover for 1 h to 2 h.
The oceanographic instruments are located in a highly corrosive marine salt fog environment for most of their life. Salt mist can reduce the performance of metallic and non-metallic materials. The mechanism of salt mist corrosion of metallic materials is electrochemical corrosion, while the degradation of non-metallic materials is caused by the complex chemical reaction between salt and materials. The impact of salt mist corrosion on the instrument mainly includes: corrosion caused by electrochemical reaction and accelerated stress corrosion. This failure mode will cause the product's resistance to the environment to decrease, resulting in a reduction in product performance and affecting the normal function of the product and structural integrity; salt deposits cause damage to the electrical components of the instrument, blockage or jamming of the transmission parts of mechanical parts and components; corrosion of insulation materials and contact metal will cause the electrical performance of the product to change or even fail to meet the requirements of use, such as decreases insulation resistance, contact resistance increases, etc.; in addition, salt mist corrosion can also cause blistering, peeling, and peeling of the surface coating, which will cause the product's logo and imprint to fade, be blurred, unrecognizable, and fall off, thereby affecting the product appearance and so on.
Most oceanographic instruments are used outdoors, and the salt fog environment, mold growth environment, and sand dust environment can exist at the same time. Due to the interaction between the salt mist test, the mold growth test, and the sand dust test, for example, the surface of the instrument after the sand dust test may cause scratches on the surface coating or metal surface of the test piece due to the friction of the sand and dust. This will cause misjudgment of the results of the salt mist test. The surface of the instrument after the mold growth test may be corroded by mold due to the growth of mold, which will also affect the results of the salt mist test. If the sample after the salt mist test is not cleaned thoroughly, the residual salt will affect the growth of mold and affect the results of the mold test. Therefore, when the same sample is used for these three tests, the mutual influence between the tests should be minimized. The test samples should be thoroughly cleaned between the three tests, and the test results produced by each test should be compared and analyzed to distinguish sample responses to different tests.
The device name/model | Technical specification |
The salt spray test chamber | 1)Laboratory temperature range: +35℃~+50℃ 2)Saturated barrel temperature: 47℃~63℃ 3)Saltwater temperature:+35℃~+55℃ 4)Temp. undulation: ≤±0.5℃ 5)Temp. uniformity: ≤±2℃ 6) Test time: 0-999H, M 7)Settlement amount: 1-2mL/80cm2/h |
Compound salt spray test room | 1)Studio size：2)5m*2.0m*3.62m(W×L×H) 3)Temperature fluctuation: ±0.5℃ 4) Temperature uniformity: ≤ 2℃ 5)Temperature deviation: ±1℃ 6)Spray deposition (m1/80cm2.h): 1-2mL 7)Humidity range: 20-98% 8)Spray pressure: 1±0.01kgf/cm2 9)Test chamber capacity: 18m3 10)Main functions of the equipment: Neutral salt mist, Alternating salt fog |
The units involved in drafting standards
“Shenzhen ORT Technical Services Co., Ltd.”
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