Hydraulic cylinder electroplating hard chrome layer why can peel
2023-02-22
The hydraulic cylinder will have wear marks during operation. Although these marks do not seem to affect the normal use of the hydraulic cylinder, the problem will come after a long time. There are many reasons for the running trace, and the peeling of hard chromium plating layer is one of them. What are the reasons causing this problem?
a. The coating does not bond well. The main reasons for poor bonding of electroplating coating are as follows: before electroplating, the oil removal and degreasing treatment of parts is not sufficient; Part surface activation treatment No, the oxide film is not removed.
b. Wear and tear in hard topography. The wear of hard chromium plating layer is mostly caused by the grinding effect of the friction iron powder of the piston. When there is moisture in the middle, the wear is faster. Corrosion due to the contact potential difference of the metal occurs only where the piston touches, and the corrosion occurs in point form. As mentioned above, the presence of moisture in the middle encourages the development of corrosion. Compared with castings, the contact potential difference of copper alloy is higher, so the corrosion degree of copper alloy is more serious.
c. Corrosion due to contact potential difference. Contact potential difference corrosion, for a long time running hydraulic cylinder, is not easy to occur; It is a common fault for the hydraulic cylinder to stop for a long time.
a. The coating does not bond well. The main reasons for poor bonding of electroplating coating are as follows: before electroplating, the oil removal and degreasing treatment of parts is not sufficient; Part surface activation treatment No, the oxide film is not removed.
b. Wear and tear in hard topography. The wear of hard chromium plating layer is mostly caused by the grinding effect of the friction iron powder of the piston. When there is moisture in the middle, the wear is faster. Corrosion due to the contact potential difference of the metal occurs only where the piston touches, and the corrosion occurs in point form. As mentioned above, the presence of moisture in the middle encourages the development of corrosion. Compared with castings, the contact potential difference of copper alloy is higher, so the corrosion degree of copper alloy is more serious.
c. Corrosion due to contact potential difference. Contact potential difference corrosion, for a long time running hydraulic cylinder, is not easy to occur; It is a common fault for the hydraulic cylinder to stop for a long time.
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