Pre-processing
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| Aerospace product pre-processing
Before aerospace products enter the final assembly or testing phase, processes such as material surface treatment and component pre-assembly are carried out to ensure the product meets the requirements of subsequent manufacturing steps. This stage must complete critical treatments—like corrosion protection and stress relief—before final assembly begins, while strictly adhering to aerospace product development standards.
The Standard Terminology for Aerospace Science and Technology was published in 2005 and has continued to be updated up to 2020.
| Pre-coating Surface Treatment
This process includes steps such as degreasing, rust removal, and phosphating, all aimed at eliminating oil stains and rust to ensure strong adhesion for the coating. A typical sequence is: degreasing → water rinsing → rust removal → phosphating → passivation → water rinsing. Among these, phosphating is the core step, as it requires thorough removal of oil and rust to guarantee optimal coating performance.
| Sample Pre-processing
In chemical analysis, this process accounts for 70% of the total workflow, focusing on concentrating trace components and eliminating matrix interferences. Techniques include supercritical fluid extraction and solid-phase microextraction, while automated equipment can boost efficiency by up to 100%. For instance, the fully automatic QuEChERS instrument uses advanced technologies like intelligent liquid handling and centrifugation to minimize operational errors.
Textile Pre-treatment
By using chemical and physical methods, fabric impurities are removed, resulting in fabrics that are white, soft, and have enhanced permeability—qualities that ensure the fabric meets the standards required for subsequent processes like dyeing and printing, providing a high-quality semi-finished product.
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