Climate Chambers for Volvo VCS-1027,149 Accelerated Corrosion Test
Shanghai Lenprue company products cover Temperature Humidity Test Chambers, Cycling Chambers, Illumination Chambers, UV and Xenon Aging Chambers, Thermal Shock Chambers, IP Protective Test Chambers (Rainfall chamber, Dust and Sand Test Chamber), Walk-in Climatic Chambers, Salt Corrosion Chambers and Non-standard environmental chambers, etc.
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This standard defines an accelerated corrosion test method to be used in assessing the corrosion resistance of metals in environments where there is a significant influence of chloride ions, mainly as sodium chloride from a marine source or by winter road deicing salt.
It specifies a test procedure to be used in conducting the accelerated corrosion test to simulate atmospheric corrosion conditions in a controlled way.
The climate chamber shall be designed so that the following test conditions can be obtained, controlled and monitored during the test.
During a period of constant climate conditions an accuracy of ±3% RH for the mean value in relative humidity shall apply, corresponding to a minimum temperature accuracy requirement of in this case ±0.6C. For the instantaneous maximum deviation from set relative humidity a value of t5% RH in the range from 50% RH to 95% RH at 40°C shall apply.
The climate chamber must be designed so that the relative humidity may be changed linearly with respect to time, from 95% RH to 50% RH within 2 h.
To meet the temperature and humidity accuracy requirements, the climate chamber should be equipped with means to provide evenly distributed efficient circulation of air to secure small temperature and humidity variations in the chamber. Sufficient insulation of the chamber walls and lids is required in order to avoid excessive condensation on these surfaces.
The humidity and temperature levels of the climate chamber during a test cycle shall be continuously monitored. The humidity and temperature sensors should reflect the climate conditions in the very test area.
For measurement of the relative humidity use a hygrometer designed for measurements at high humidity levels, e.g. a high-quality psychrometric sensor or a gold mirror dewpoint meter. For temperature measurements, the use of a resistance thermometer is required.
The spraying device shall be capable of producing a finely distributed, uniform spray falling on the test objects with a flow corresponding to a downfall of 15 mm/ht5 mm/h.
When using spray the solution must not be reused.
The device for salt spraying shall preferably be made of a number of flat spraying nozzles mounted in series on a rail or tube in such a way that their spray patterns are partly overlapping.
A swaying mode of the tube member must be implemented in order to distribute the salt solution uniformly over the complete test area.The spraying device shall be made of, or lined with, materials resistant to corrosion by the salt solution. The use of plastics material is recommended.
After achieving wet conditions by spraying, all test objects shall be dried from excessive visible wetness in order to regain climate control. Hence the climate chamber should be equipped with a system for drying in a forced airflow.
Forced drying is preferably arranged by supercooling and reheating an internal circulating flow. Alternatively, drying may be arranged by letting a forced flow of preheated ambient air ventilate the chamber. For a climate chamber of the volume 1-2 m an airflow rate of 50-100 l/s is recommended. The forced airflow shall not be preheated to such temperature levels that a temperature of 40 C will be exceeded.
If wetting is achieved by immersion in salt solution.drying under ambient conditions may be permitted.
The test solution shall be prepared by dissolving sodium chloride in deionized water to a concentration of1.0 % ±0, 1% (by weight). The salt can allow a maximum amount of the following impurities in the sodium chloride:
Copper 0.00 1%
Nickel 0.01 %
Sodium iodide 0,1 %
The total level of contamination counted on dry salt must not exceed 0.4 % by weight.
The one-week main test cycle is composed of two twelve-hour sub-cycles, one with controlled humidity cycling; sub-cycle 1, the other including salt solution application, sub-cycle 2.
Sub cycle 1 requires constant conditions at 35°C & 95% RH for 4 h, followed by an increase of temperature to 45°C whilst reducing the humidity to 50% over a 2 hour period. This is followed by constant conditions of 45°C & 50% RH for 4 h, together with a 2 hour period of 35°C & 95%RH. Step 1:4) Temperature decrease from 45°C to 35°C.
Sub cycle 2 requires spraying with salt solution for 15 mins then keeping the samples at 35°C for 1 h 45 min whilst maintaining a set point of 95% - 99% RH in such a way that the test objects remain wet. These steps are repeated in sequence to give a total period of 6 hours. Drying at 45°C & 50% RH for a 2 hour period followed by a further 2 hour period of 35°C whilst maintaining 95% RH.
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