Hot-dip aluminizing of steel products has a stable market in high corrosion-resistant components, thin plates, fasteners, wire rods and other products, and has grown with the economic development. For hot-dip aluminized films for steel parts, the items to be tested are as follows.
(1) The adhesion test is carried out by the weighing method. The weight of the aluminum plating after the weight per unit area of ​​the workpiece is calculated by subtracting the weight after the aluminum is removed by the sodium hydroxide solution, ie, the adhesion amount per unit area.
(2) Coating thickness can be measured by metallographic method or coating thickness tester.
(3) The uniformity of coating can be tested by the copper sulfate dipping test.
(4) plating porosity test method can be used potassium ferrocyanide test method.
(5) Heat resistance test This test is limited to parts that require heat resistance. Samples should be heat-treated at 800-850°C for 3 h to detect the diffusion of aluminum in the matrix. The results were examined by metallographic microscopy. .
(6) Mechanical performance tests include bending test, curl test, static pressure test and impact test.
(1) The adhesion test is carried out by the weighing method. The weight of the aluminum plating after the weight per unit area of ​​the workpiece is calculated by subtracting the weight after the aluminum is removed by the sodium hydroxide solution, ie, the adhesion amount per unit area.
(2) Coating thickness can be measured by metallographic method or coating thickness tester.
(3) The uniformity of coating can be tested by the copper sulfate dipping test.
(4) plating porosity test method can be used potassium ferrocyanide test method.
(5) Heat resistance test This test is limited to parts that require heat resistance. Samples should be heat-treated at 800-850°C for 3 h to detect the diffusion of aluminum in the matrix. The results were examined by metallographic microscopy. .
(6) Mechanical performance tests include bending test, curl test, static pressure test and impact test.