Cnc Machining

How to deal with rust in sheet metal machining

Deal With Rust In Sheet Metal Machining?

Sheet metal machining includes traditional cutting and blanking, blanking, bending and forming methods and process parameters, as well as various cold stamping die structures and process parameters, various equipment working principles and operating methods, and new punching technologies. And new processes. Sheet metal machining of parts is called sheet metal machining.

How to deal with rust in sheet metal machining

How to deal with rust in sheet metal machining -PTJ CNC MACHINING Shop

Rust will seep out of sheet metal after phosphating, so this is a problem that many factories need to solve urgently. However, before we can understand the reasons for this phenomenon, we can take corresponding measures. There are two main reasons for rust:

  • 1. The acid in the cracks during pickling is not neutralized or incompletely neutralized, and the phosphate film is not completely rusty, and the rust spreads out of the cracks for a period of time after painting.
  • 2. Strong acid pickling, strong alkaline degreasing. The medicaments remaining in the crevices were neutralized with each other and washed without washing. After baking, white products were sewn out. These white products are painted for a while. It reacts with the corrosive medium in the air and overflows the gap.


  • 1. For degreasing, use weak alkaline degreasing. Must not contain protopine. TAL should be controlled around 15POINT and ph cannot exceed 13.
  • 2. Sulfuric acid can be used for pickling. Pickling time should not be too long. Phosphoric acid is recommended.
  • 3. After pickling, neutralize with 1-2 sodium carbonate;
  • 4. Surface adjustment is recommended to use oxalic acid, the concentration is 1-2;
  • 5. The acidity of zinc phosphating treatment should take the upper limit. Dipping treatment concentration: above TA35, FA1.2AC8 (20CC fermentation tube)
  • 6. It is not necessary to wash all water washing projects, and the water washing should keep overflow

Link to this article:  How to deal with rust in sheet metal machining

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:,thanks!

How to deal with rust in sheet metal machiningPTJ® provides a full range of Custom Precision cnc machining china services.ISO 9001:2015 &AS-9100 certified. 3, 4 and 5-axis rapid precision CNC machining services including milling, turning to customer specifications,Capable of metal & plastic machined parts with +/-0.005 mm tolerance.Secondary services include CNC and conventional grinding, drilling,die casting,sheet metal and stamping.Providing prototypes, full production runs, technical support and full inspection.Serves the automotiveaerospace, mold&fixture,led lighting,medical,bicycle, and consumer electronics industries. On-time delivery.Tell us a little about your project’s budget and expected delivery time. We will strategize with you to provide the most cost-effective services to help you reach your target,Welcome to Contact us ( [email protected] ) directly for your new project.