Detection of hot-dip aluminized film
ã€China Aluminum Industry Network】 Hot-dip aluminum products for iron and steel products have stable stores in high-corrosion components, thin plates, fasteners, wire rods and other commodities, and have increased following the economic development. With regard to hot-dip aluminized films for steel parts, the items required for inspection are as follows.
(1) The adhesion amount experiment was performed by weighing method. The weight of the aluminum plating after the unit area of ​​the workpiece was subtracted by the amount of the sodium hydroxide solution after the aluminum was removed, which means the adhesion amount per unit area.
(2) Coating thickness inspection Metallographic or coating thickness tester can be used.
(3) coating uniformity test can be used copper sulfate impregnation test method.
(4) Plating Porosity Experimental method Potassium ferrocyanide experimental method can be used.
(5) Heat-resistant function test This test is limited to parts that require heat-resistance. Samples are heat-treated at 800-850°C for 3 hours to check the dispersion of aluminum in the matrix and examined by metallographic examination. .
(6) Mechanics function experiments include tortuous experiments, bending tests, static pressure tests, and impact tests.
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