Corrosion resistance of galvanized channel steel is mainly determined by the thickness of the galvanized layer, so the measured thickness is often the basis for determining the quality of galvanized steel. The galvanized layer has different reactions depending on the composition, structure, and structure of the steel surface. The angle and speed of entering and exiting the zinc solution also have a great influence. Therefore, it is virtually impossible to obtain a completely uniform plating thickness. Therefore, the measurement of the amount of adhesion must not be determined by a single point (site), and it is only meaningful to measure the unit area (?) of the average attached zinc weight (g).
There are many ways to measure the adhesion amount of galvanized channel steel, such as destructive metallographic observation method, pickling method, non-destructive film thickness method, electrochemical method, and estimation of the incoming and outgoing weight difference. Commonly used film thickness method and pickling method.
Film thickness meter (plating thickness gauge) is a method for measuring the thickness of zinc layer by using magnetic field induction. The basic condition is that the steel surface must be smooth and complete to obtain more accurate figures. Therefore, in the corners of steel or rough, angled steel or castings, etc., are not likely to be an accurate figure. Ordinary iron with the original iron material is zero, there are still quite accurate figures, castings are absolutely inaccurate.
Pickling method is the most accurate method for formal inspection report. However, when cutting, it must pay attention to the fairness of the upper and lower parts to obtain accurate figures. However, it also has its shortcomings. For example, it takes a lot of time, the area of ​​complex steel is not easy to obtain, too large parts cannot be pickled, etc. Therefore, it is sufficient to make full use of the galvanized channel steel film thickness gauge to control the on-site process, and to use the acid cleaning method for the final inspection.
Tag: Galvanized channel steel, channel steel, adhesion, pickling, zinc coating
There are many ways to measure the adhesion amount of galvanized channel steel, such as destructive metallographic observation method, pickling method, non-destructive film thickness method, electrochemical method, and estimation of the incoming and outgoing weight difference. Commonly used film thickness method and pickling method.
Film thickness meter (plating thickness gauge) is a method for measuring the thickness of zinc layer by using magnetic field induction. The basic condition is that the steel surface must be smooth and complete to obtain more accurate figures. Therefore, in the corners of steel or rough, angled steel or castings, etc., are not likely to be an accurate figure. Ordinary iron with the original iron material is zero, there are still quite accurate figures, castings are absolutely inaccurate.
Pickling method is the most accurate method for formal inspection report. However, when cutting, it must pay attention to the fairness of the upper and lower parts to obtain accurate figures. However, it also has its shortcomings. For example, it takes a lot of time, the area of ​​complex steel is not easy to obtain, too large parts cannot be pickled, etc. Therefore, it is sufficient to make full use of the galvanized channel steel film thickness gauge to control the on-site process, and to use the acid cleaning method for the final inspection.
Tag: Galvanized channel steel, channel steel, adhesion, pickling, zinc coating
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