The galvanized sheet is coated with a zinc layer on the surface of the cold-rolled sheet. Usually, the grades include SECC, SECD, SECE, etc., and the original board replaces E with P. Due to the protection of the zinc layer, the rustproof performance of the galvanized sheet is relatively good, and the rusting portion which usually occurs is a brownish red rust spot at the incision; if the plating layer is oxidized, white rust appears.
Meniscus Lenses: The Positive Meniscus can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens. The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.
We supply kinds of Plano-Convex Spherical Lens,Plano-Concave Spherical Lens,bi-convex Spherical Lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our optical meniscus spherical lens as follow:
Many galvanized sheet metal processing companies will be concerned about the rust prevention of galvanized sheet products after degreasing and cleaning after processing the products. So, how should we clean the galvanized sheet products and how to prevent the rust after the galvanized sheets are cleaned?
There are two main issues to consider in galvanized sheet cleaning:
1. The incision of the galvanized sheet product is easy to rust. The choice of the cleaning agent must take into account that it does not affect the rust of the incision part during the cleaning process and after the cleaning, and also has a rust prevention function.
2. The coating of galvanized sheet is easily affected. It is not the special galvanized sheet cleaning agent that will cause dezincification. Therefore, special galvanized sheet cleaning agent must be selected, which will not affect the coating.
3, the residue of the cleaning agent, galvanized sheet cleaning agent must not affect the material properties, etc., micro residue will not affect the product in the future storage. Such as white flowers, long black spots, etc.
There are two types of galvanized sheet cleaning methods, one is solvent cleaning and the other is water-based cleaning. Water-based cleaning agents are recommended for cleaning costs, environmental protection, and operator health.
Probably the cleaning process is: degreasing - rinsing - rinsing - rust - drying. It is recommended to find a professional cleaning agent manufacturer for on-site use guidance.
Here is a real case:
A Taiwan-funded enterprise in Huizhou Danshui specializes in stamping hardware products. The company has already set up a cleaning workshop to clean all kinds of hardware products, but it has not been able to clean the galvanized sheet products. Its galvanized sheet material is imported material. It has been tried and washed but the coating is corroded. Several cleaning agent manufacturers have also been found, but the effect is not satisfactory. Therefore, it has been cleaned and packaged and shipped by hand wiping. Later, as the orders for galvanized sheet products increased to become the main production products, the cleaning problem once again showed the necessity of solving. After the introduction of the peers, the factory contacted me Changlufeng Chemical Company to convey the cleaning problem of this kind of products. Our company directly dispatched customer service personnel to the company to conduct on-site understanding of the situation.
First of all, we communicated the surface contamination of the product as the punching oil added during the processing and the oil and dust stuck on some molds. After the dirty cleaning is required to be removed, it is also treated to prevent the incision corrosion during the subsequent packaging and transportation.
Our company first understands its existing cleaning workshop equipment. One original single-tank ultrasonic cleaning machine and one oven are relatively simple. According to this situation and the production requirements of the products, our customer service staff recommended to the company the use of water-based cleaning agents. The water-based cleaning agent method uses a water-based cleaning agent as a concentrated liquid, and needs to be watered to a concentration of 2-5% when used, so the cost is relatively low. However, the use of water-based cleaning agents has many processes, and existing equipment conditions require simple modifications. The original single tank cleaning machine is used as the cleaning tank, and three tanks are added for rinsing and rust prevention. The process is degreasing---rinsing---rinsing---rust---drying.
After that, the customer service has a certain understanding of the development of this project. It is agreed that our company will conduct a trial on the spot. At the experimental site, our customer service staff first cleaned the product workpiece according to the process. As a result, the customer service judged that the product cleanliness reached the required standard, and then carried out the packaging inventory.
After one week, our company received the phone number from the company. The product has no rust and the test is up to standard.
The case is ultimately a win-win result, and the two sides have been happy to cooperate.
Company: Shenzhen Evergreen Chemical Technology Co., Ltd. Tel: 
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
Meniscus Spherical Lens,Meniscus Spherical Lenses,Optical Glass Meniscus Lens,Glass Meniscus Lens
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