Types Of Corrosion That Are Common In Aluminum Profile
1. Point erosion point erosion, also known as hole erosion, is a metal in the needle-like, point-like, hole-like for a local erosion pattern. Point erosion is a weird form of the anode, which is an autocatalytic process, that is, the premise of the erosion process in the point of erosion is to promote and continue to sustain the erosion.
2. The average erosion of Aluminum Profile acid and sodium hydroxide and other solutions, the oxide film will melt, the average erosion, ablation rate is also average. Solution temperature rise, solute concentration plus large, to promote the erosion of Aluminum Profile.
3. The SCC of the stress corrosion cracking (SCC) Aluminum Profile alloy was discovered at the beginning of the 20th century. Metal in the stress (tensile stress or internal stress) and erosion of the media connected to the occurrence of a damage, known as the SCC. SCC is characterized by the formation of erosion & mdash; mechanical cracks, Aluminum Profile can grow along the grain boundary, can also be extended through the grain. Because the crack expansion is in the metal inside, will make the strength of metal structures declined, serious will occur when the sudden damage. SCC in the inevitable premise will occur, they are:
4. Rupture Erosion Rupture is a local erosion. Metal parts in the electrolyte solution, because the metal and metal or metal and non-metallic cracks between the formation of its width enough to make the media immersed in the media and a block in the situation, making the cracks inside the phenomenon of increased erosion known as the erosion of erosion. The following are the same as the "
----- the inevitable tensile stress or metal internal residual stress; plate and strip material waste and the reasons for the occurrence
1. Through the stomatal casting quality is not good. The following are the same as the "
2. Overview of the bubble ingot high hydrogen content of the organization loose; ingots Overview of convex and concave of the premises of the dirty side of the East, there is no Aluminum Profile before processing furnace wipe; erosion, the ingot and the package of aluminum profile are etched Traces; heating time is too long or the temperature is too high, casting block oxidation; the first welding rolling, the emulsion nozzle is not closed, the emulsion flow to the package under the Aluminum Profile. The following are the same as the "
3. Casting cracking hot rolling pressure when the amount of large, from the ingot head cracking; ingot heating temperature is too high or too low. The following are the same as the "
4. Mechanical function failed to do the correct implementation of the heat system or heat treatment equipment is not normal, the air cycle is not good; quenching fashion material, salt bath temperature is not enough time furnace, insulation time is insufficient, did not reach the designated temperature that is baked; The heat treatment system used in the laboratory or the test system is not correct; the sample gauge is not divisible and the sample profile is damaged. The following are the same as the "
5. Casting slag casting quality is not good, the board folder with metal or non-metallic residue. The following are the same as the "
7. Too thin to adjust the amount of adjustment is not true; thickness gauge failure or use; The following are the same as the "
6. Tearing oil composition is not qualified or the emulsion is too strong, between the plate and roll sliding, metal deformation is not average; no control of the rolling rate, the amount of pressure was excessive; rolling speed crossing; reel tension adjustment It is not enough, the tension is not constant; annealing quality is not good Aluminum Profile; metal plasticity is not enough; roller type ban is absolutely no, so that the metal stress too large; hot rolled reel edge; rolling lubrication is not good, Friction is too large; roll is not correct, with the side of the plate tensile stress, while the occurrence of compressive stress, so that the edge of a small gap, after repeated rolling, from the cracks continue to expand, as well as tear; Machine jaws clamped incorrectly or uneven, or the board has cracked edge, stretching will cause tear; quenching, pocket pocket pocket is too good or too tight, so that plate fracturing, stretching straightening Causing tearing. The following are the same as the "
8. Pressure folding (folding) roller type is prohibited, such as calendering machine bearing fever, so that the two swollen roll, the effect of pressure out of the plate center thick both sides of thin; pressure plate before the waves too old industrial Aluminum Profile night, So that the amount of calendering too large, resulting in bending; thin plate when the pressure is not easy to roll into the pressure; plate thickness difference between the two sides, prone to pressure. The following are the same as the "
9. Non-metallic into the hot rolling mill roll, roller, hinge and other unclean, the process of disappearance of dirt in the car belt, the formation of rolling; cold rolling mill roll, guide roller, three roller correction Straight machine, coiler and other parts of the contact with the plate unclean, the dirt into the rolling oil nozzle clogging or pressure is low, with the plate on the profile of non-metallic metal erosion is not missing; emulsion change is not real-time , Aluminum Profile powder is not clean and the emulsion tank is not washed clean.