How to handle the causes of rust and anti-corrosion in customized sheet metal processing

How to deal with rust in customized sheet metal processing:

1. During acid pickling and passivation, the acid at the gaps is not properly treated or treated. The acid pickling and phosphating result in a film that is not easily corroded. After spraying, rust will spread to the gaps after a period of time

2. Strong alkaline acid washing and passivation, strong alkaline degreasing solution, residual in the gaps due to oxidation and mutual fusion, many manufacturers do not clean up with tap water, resulting in milky white products on the gaps after drying. After spraying for a period of time, this milky white product, together with the corrosive substances in the gas, causes a certain type of exothermic reaction at the overflow gap, which often occurs

The solutions to avoid rust in sheet metal processing are as follows:

1. Weak alkaline degreasing must be used, and it should not contain alkali flakes. TAL should be controlled above and below 15 points, and pH should not exceed 12.

2. The process of acid pickling and passivation can use hydrochloric acid pickling and passivation. The pickling and passivation time does not need to be too long, and the application of ammonium sulfate is just right

3. After pickling and passivation, please use 1-2 sodium carbonate as a medium

4. Chemical materials such as hydrochloric acid should be used for surface adjustment, with a concentration value of 1-2 degrees

5. The acid value of zinc based acid pickling phosphating should be limited, and a pre immersion solution should be tried: TA: around 45, FA: 1.3AC: 8 (20cc alcohol tube).

6. Do not clean and tidy all hand washing projects, and maintain an overflow style for hand washing

What are the methods for customizing sheet metal processing

Sheet metal processing is a key technology that sheet metal technicians need to master, and it is also an important process for forming sheet metal products. Sheet metal processing includes traditional methods and process parameters such as cutting, punching, bending and forming, as well as various cold stamping mold structures and process parameters, various equipment working principles and control methods, as well as new stamping technologies and processes. Metal sheet metal processing for parts is called sheet metal processing. What are the methods for customizing sheet metal processing

1. Bottom rust removal for sheet metal processing products

2. Epoxy zinc rich primer is used as an anti rust primer for steel structures and steel products. The coating has physical and chemical properties, is easy to apply, and has good supporting functions.

. Ingredients include epoxy resin, epoxy curing agent, zinc powder, rust proof pigment, additives, and organic solvents

3. Epoxy cloud iron center paint for sheet metal processing products: used in conjunction with epoxy zinc rich primer as a coating transition layer to enhance the sealing of composite coatings. It can also be used as an anti rust primer, with strong and tough coating film, adhesion and sealing properties, and compatibility with front and rear coatings. Its components include epoxy resin and curing agent, mica iron oxide, and anti rust pigment

4. Apply surface layer to sheet metal processing products. Its surface layer can be used for epoxy asphalt topcoat, chlorinated rubber topcoat, acrylic and polyurethane topcoat, fluorocarbon topcoat, etc