In coastal areas, the atmosphere is full of salt fog, which mainly comes from the sea water. These salt fog in the atmosphere have strong corrosive application to commodities and materials. In the process of transportation, if it passes through the sea or coastal areas, the transported goods are likely to be damaged due to the corrosion of salt fog. Therefore, under such circumstances, salt spray corrosion of commodities or articles in advance can not only fully understand the salt spray corrosion resistance in advance, but also avoid the corrosion of commodities due to poor consideration in the process of transportation. Next, let’s explore the important role of salt spray corrosion test chamber in the anti fog corrosion of articles.
The so-called salt corrosion test chamber is a common environmental detection and test equipment. It mainly creates a salt spray atmospheric environment similar to nature by simulating the content of salt spray in the atmosphere, so as to investigate the corrosivity of products in the salt spray atmospheric environment. The main applicable objects of the salt spray corrosion chamber are some electronic parts, product parts, external protective layers of metal materials and salt spray corrosion tests of some industrial products, The salt spray corrosion test of these products provides a reliable scientific basis for improving the anti-corrosion ability of products.
The salt spray corrosion box is mainly composed of movable box, pneumatic system, heating system and electrical control system. The cover of the salt spray corrosion box is mainly made of transparent materials, which makes it easy to observe the corrosion degree of the products in the box. The corrosion inspection of the tank and gas mist system is mainly completed by the cooperation of several electrical systems.
The temperature of salt spray corrosion test chamber will have different errors in different time and environment. The temperature item of salt spray corrosion test chamber includes three parameters: temperature deviation, temperature fluctuation and temperature uniformity. The temperature of spray fog corrosion test chamber is not always stable, and its temperature fluctuation is greatly affected by the outside world. Therefore, in order to detect the temperature of the salt spray corrosion chamber and reduce the temperature error of the salt spray corrosion chamber, it is necessary to understand the factors affected by the temperature of the salt spray corrosion test chamber. Only by understanding these, it is possible to take correct measures to reduce the temperature error of the salt spray corrosion chamber and maintain its temperature stability.
For different types of salt spray corrosion tanks, the influencing factors of temperature are also different. For centrifugal fog salt spray corrosion tanks, its temperature influencing conditions are mainly ambient temperature, thermal power and so on. For the salt spray corrosion chamber with air spray, its temperature influencing factors should include air flow, the quality of temperature controller and so on, in addition to the influencing factors of centrifugal fog salt spray corrosion chamber mentioned above. Moreover, the user’s operation steps and operation specifications may also affect the temperature of the salt spray corrosion tank, making its temperature error.
The temperature fluctuation of salt spray corrosion test chamber refers to the change of temperature at the geometric center of the chamber within a certain period of time. Its temperature fluctuation reflects the sensitivity of the temperature controller of the salt spray corrosion tank to a certain extent. Therefore, in order to keep the temperature fluctuation of the salt spray corrosion tank within a reasonable range, the temperature fluctuation needs to be calibrated. First of all, we should check whether the change range of the external environment exceeds the environmental conditions under which the salt spray corrosion box can work normally. If the inspection of the external environmental conditions meets the standard, the temperature patrol instrument collects it once every 2 minutes and 15 times in 30 minutes. The maximum value of the 15 times of the center point of the box minus half of the minimum value is the volatility. If the temperature still fluctuates greatly, it is necessary to consider removing the temperature controller and temperature sensor and measuring them. If they do not meet the standard, they should be replaced in time 2. The temperature uniformity and temperature fluctuation of the salt spray corrosion box are carried out at the same time, which refers to the difference between the maximum value and the minimum value of each data acquisition for 9 measuring points distributed in the box within 30 minutes. The average value of the obtained data is the value of temperature uniformity.
4.Salt Spray Sedimentation Rate
Salt fog sedimentation rate mainly refers to the use of a funnel with a certain area to collect the salt fog sedimentation of continuous atomization for 16 hours, and the average amount of salt solution collected every hour. As an important parameter of salt spray corrosion tank, the calibration of salt spray sedimentation rate is directly related to the normal operation of salt spray corrosion tank. Therefore, the calibration of salt fog sedimentation rate should be accurate, and the experimenters should try their best to ensure the accuracy of spray sedimentation rate.
Advanced technical methods should be adopted in the measurement. The factors affecting the sedimentation rate of salt mainly include the size of the measuring cylinder used in collection, the stability of the measuring cylinder, the error in the value estimation of the dry measuring cylinder by the surveyor, and the temperature inside the most cylinder in the working chamber. These are the factors affecting the sedimentation rate of salt spray in the salt spray corrosion test chamber.
When calibrating the salt fog sedimentation rate, the influence of subjective factors should be fully considered. To ensure that the measuring range of the measuring cylinder complies with the standard as much as possible, the measuring personnel shall estimate and read the scale of the dry measuring cylinder as accurately as possible, so as to reduce the error of settlement rate and calibrate it effectively.
Through the above discussion, we understand the specific meaning of the salt spray corrosion test chamber and the main composition of the salt spray test chamber. For the two important parameters of the salt spray test chamber, namely temperature and salt spray sedimentation rate. Therefore, their control and calibration are also considered. Salt spray corrosion test chamber is a commonly used means of environmental conditions in Europe at present. Through the anti fog corrosion bell test chamber, we can test the anti fog corrosion of some new articles to understand the anti fog corrosion of products, so as to effectively improve the anti salt fog corrosion treatment methods for different kinds of products during transportation and improve the safety and efficiency of transportation.