[China Aluminum Industry Network] Analysis of the three causes of uneven color of aluminum oxide film:
(1) The area of ​​the aluminum profile workpiece is too large, and the oscillation in the groove is too large during operation. The contact, renewal, and exchange of the edge and the center portion with the solution are too different, resulting in inconsistent color of the oxide film. . Preventive method: When the aluminum material is oxidized, the amplitude of the workpiece swinging is small, and the static treatment is also possible. However, when the solution temperature is too low, the map-like variegation tends to appear, which is not natural.
(2) When the aluminum cladding is processed, some of the aluminum cladding is destroyed and is cut off. The outer cladding is a high-quality aluminum, and the inner layer of the cladding is a mixed aluminum. The difference between the two aluminum is large, so the oxidation occurs. Good hurricane like spots. This phenomenon is often not understood by customers. Manufacturers should do more explanation work and explain the reasons for this so as to avoid misunderstandings.
(3) Oxidation process operation issues:
1 The alkali etching treatment of the workpiece was not complete, and the original oxide film and dirt could not be removed at the local part;
2 After the alkali etching, the light treatment was not performed immediately, and the surface of the workpiece was still alkaline;
3 The workpiece touched the foreign material during the transfer process.
When there are uneven film colors, we must look for the reasons in many ways and take targeted measures to solve them.
Caused by the excessive accumulation of aluminum ions in the alkali solution A reader calls to ask the reason why it is difficult to obtain the conductive oxide film after alkali etching. After eliminating many factors that are difficult to form the conductive oxide film, consider whether the alkali solution is There is a problem of excessive aluminum ions, the other party said that the alkaline solution is very thick. However, the alkali corrosion rate is not fast. At that time, the author suggested replacing the alkaline solution because the alkali solution will accumulate too much aluminum ions after it is used for a long time. The aluminum ions are difficult to elute on the surface of the workpiece, which affects the contact between the surface of the aluminum part and the conductive oxide solution. Formation of oxide film. Another suggestion is that if the alkaline etching solution is replaced unconditionally at the time, the alkali-etched workpiece can be rinsed in hot water immediately after rinsing with hot water, and then light is emitted from concentrated nitric acid containing hydrofluoric acid, and then fully electrically-conductive after being rinsed. Oxidation treatment. After the reader came to the phone that after alkaline etching with hot water washing effect is very good. The author's experience is that after washing in hot water, the hot water quickly leaves the hot water and is immediately immersed in running water to prevent the formation of the conductive oxide film due to oxidation after the workpiece is dried.
Application:
Huge power range from 2.2KW~160KW
Support up to 128 stops
Speed up to 4 m/s ( Up to 6m/s soon)
Support up to 8 car group control with DBD system
Meet the EN81-20 standard, UCMP, door lock short detection, door bypass function, pit inspection function Selective collection
Encoder supported : SIN/COS & EnData & ABZUVW & ABZ
Feature:
Field proven high speed technology utilizing KEB F5 inverter and AFE (Active Front End) for regenerative function
ELGO landing system for absolute floor encoding and eliminate hoist way terminal switches
Support UCMP function
ETSL function for reduce stroke buffer applications
Advance isolated CAN ports for stable communications
Applications:
Up to 64 stops.
Speed up to 8 m/s.
Simplex, duplex, and up to 6 car group.
Kinetek Or Nidec Controller,Nidec Controller,Kinetek Motor Controller,Nidec Motor Controller
Suzhou Keffran Parts Co.,ltd , https://www.keffran-elevatorsmart.com