The salt spray settlement of the salt spray test box is the central target of the salt spray test box. The standard settlement is 1~2ml/80cm2·h. If one set takes 1.2ml/80cm2·h and the other takes 1.2ml/ during the experiment. 80cm2·h, although it is within the standard settlement, the inspection results will certainly be different. In this case, the total consumption of brine in the experiment can be directly compared; the collection of settlement is questioned: the consumption is normal, but the settlement is small.
In the face of such doubts, we must first consider whether the salt spray test box is leaking, that is to say, the salt water consumed is not completely sprayed out. It is not necessary to think about whether the nozzle is broken, whether the mist collecting funnel is skewed, whether the hose between the mist collector and the funnel is blocked or the like. If the amount of settlement cannot be reflected, the user will be given a misunderstanding that the amount of spray is small.
Temperature setting: If there is a difference in the temperature setting of the salt spray test box, there will no doubt be a difference in the inspection results; the concentration of the salt water is questioned: the standard salt spray test concentration is 5% (salt and water mass ratio is 5:95) If the concentration of salt water is too large, it will increase the corrosion degree of the sample;
Brine pH question: After the standard brine is well equipped, its pH should be neutral (pH between 6.5 and 7.2). However, the purity of some salts does not reach the request, and may be affected by water quality. The pH of the formulated brine is often not within the scope of the request. Therefore, after requesting the installation of salt water, the salt spray test box needs to pass the PH test paper to test its pH. Above this specification, add a few drops of Hcl for neutralization; below this specification, add some NaoH for neutralization. Until the pH value is neutral stop. It is important to know that once experiments are carried out using non-neutral brine, the degree of corrosion of the sample is multiplied. (For example, when the PH value is equal to 3.5, the degree of corrosion is 7-8 times when the pH value is equal to 7.0).
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