The purpose of salt spray testing is to determine the corrosion resistance of metal materials, metal materials, or plating layers of corrosion resistant screw products, and the determination of salt spray testing results is precisely the judgment of the quality of corrosion resistant screws. Its judgment result is a key standard for correctly measuring the salt spray corrosion resistance quality of corrosion resistant screws. The judgment methods for salt spray test results include: rating judgment method, weighing judgment method, corrosion occurrence judgment method, and corrosion data statistical analysis method
The rating method is to divide the percentage of the corrosion area to the total area into several levels according to a certain method, and use a certain level as the basis for qualification judgment. It is suitable for evaluation of flat plate samples. The weighing judgment method is a method of weighing the weight of the sample before and after the corrosion test, and calculating the weight of the corrosion loss to evaluate the corrosion resistance quality of the sample. It is particularly suitable for assessing the corrosion resistance quality of certain metals. Corrosive substance appearance determination method is a qualitative determination method, which determines whether the product undergoes corrosion phenomenon after salt spray corrosion test to determine the sample. Generally, this method is mostly used in corrosion resistant screw standards. The statistical analysis method for corrosion data provides a method for designing corrosion tests, analyzing corrosion data, and determining the confidence level of corrosion data. It is mainly used for analyzing and counting corrosion conditions, rather than specifically determining the quality of a specific corrosion-resistant screw