The paper presents the possibility of using the ImageJ computer program for image analysis as a method of assessing the proportion of sample surfaces occupied by corrosion. The program allows to calculate the size of any graphic selection and calculates the number of pixels contained in it, can also measure distances and angles between points or elements of images. The study used a sample made of steel 23MnB4. After preparing the surface, the samples were divided into three groups, which were then subjected to galvanic, hot-dip and lamela process. After the galvanizing, metallographic examinations were carried out during which the thickness and structure of the applied layer were assessed, and then corrosion tests were carried out in a salt chamber. The final stage of the research was a computer analysis of the image of the sample surfaces to be tested. For this purpose, the ImageJ program was used. The evaluation of the corrosion process using computer image analysis proves that such an assessment is more accurate than the method recommended by standards or comparison with standards and can serve, in addition to traditional measurements, to quantify the corrosion rate in a salt chamber. The unquestionable advantages of the program are its free availability, the possibility of expanding its own extensions and cooperation with any operating system.Keywords: Computer program, surfaces, steel, salt chamber, ImageJ
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