DongGuan TD Precision Machine CO.,LTD

	Qualification method steps aluminum

Release time：2016.03.24 News source：壳体_铝型材挤压_铁皮机箱_铝盒加工-宁波佳和壳体有限公司 Views：

Quality aluminum chassis shell of good and bad, mainly to see the quality of aluminum, and aluminum quality is good or bad how to judge it, and when used in large ships to purchase aluminum number is impossible to check, in order to reduce unnecessary trouble, choose a good supply manufacturers is very important. Quality aluminum good and bad, and when used in large ships to purchase aluminum number, impossible to check, in order to reduce unnecessary trouble, choose a good supply manufacturers is very important, if you understand the effects of aluminum good or bad quality profiles of several factors, you can rest assured that as a basis to buy the material.
The quality aluminum identification methods / procedures:
1, identification check: Are marked with product standard code and production license number, etc. on the aluminum chassis and packaging.
2, surface quality: In addition to the aluminum chassis surface should be clean, not allowed to have cracks, peeling, corrosion and the presence of bubbles and other defects, but also does not allow corrosion spots, electrical burns, dark spots and other defects off oxide film.
3, the oxide film thickness: aluminum oxide film is formed in the anodic oxidation, with a protective and decorative effect, eddy current thickness can be used for testing.
4, sealing quality: aluminum anodized surface after leaving many gaps, if not closed or closed well, will reduce aluminum corrosion resistance. Sealing quality inspection methods commonly used acid leaching, admittance and phosphorus butyric law. Site inspection commonly used acid leaching, upcoming aluminum surface cleaned with acetone to remove oil and dust, a volume ratio of 50% nitric acid dropped onto the surface and gently scrub, wash with water after 1 minute of nitric acid, and then rub dry, drop dropped onto the surface of the medical gentian violet, 1 minute, gentian violet and wipe clean the surface thoroughly, carefully observe the marks left by poor sealing will leave visible traces of aluminum, traces of the heavier Description sealing quality worse.
5, corrosion resistance: This indicator affects the life of aluminum, copper corrosion checks have accelerated acetic acid salt spray test and drop test base, here drop test base, that is, under 35 ℃ ± 1 ℃, approximately 10mg, 100g / L NaOH solution was dropped to the aluminum surface was visually observed at droplet until bubbling corrosion, the oxide film is penetrated calculate its time, this test is easy in the summer outdoors rough step judgment, to ensure test the accuracy must be carried out in the laboratory requirements under stringent conditions.
Regular aluminum factory, in the preparation of the alloy composition, have internal standards, that is, within the scope of the various elements of the content, the plants have their own range of smaller changes, the ratio between the aluminum, magnesium, silicon three requirements are very strict, each plant has its own data, mutual confidentiality. Made of an alloy recipe qualified, in order to ensure the quality of this, or how to process, quality is also stagnant.

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