In the production of metal industry, pickling of the surface of hardware is a crucial link. This process aims to remove scale, rust and other contaminants on the surface of hardware to ensure the performance of hardware materials and extend their service life.
 

Pickling of metal surfaces involves chemical reactions, in which technicians use acid solutions to dissolve oxides and other impurities on the metal surface. In this process, the acid reacts with the metal oxide to form salts soluble in the acid solution, thereby cleaning the metal surface. Pickling not only improves the cleanliness of the metal surface, but also helps to improve the quality of subsequent coatings or plating, and enhance the corrosion resistance and appearance of the metal.
 

Pickling is widely used in the pre-treatment or intermediate treatment of processes such as electroplating and rolling, and plays a decisive role in ensuring the quality of hardware and the smooth progress of the process.

Key technologies for pickling of hardware
Selection of pickling solution: The choice of acid depends on the type of metal and the nature of the surface contaminants. For example, hydrochloric acid has a strong ability to corrode metal oxides, while sulfuric acid has a more significant ability to dissolve iron oxide at high temperatures.
 

The treatment steps include:
Pretreatment: remove grease and dirt from the surface of the hardware to ensure the pickling effect.
Pickling: immerse the hardware in acid and adjust the acid concentration and treatment time according to the type of metal and the degree of contamination.
Rinsing: Rinse the surface of the hardware thoroughly with clean water to remove residual acid and reaction products.
Neutralization: Use alkaline solution to neutralize the acid that may remain on the surface of the hardware to prevent subsequent corrosion.
Drying: Ensure that the surface of the hardware is dry to prevent new rust from forming.

Precautions:
Our technicians control the concentration and treatment time of the acid to avoid excessive corrosion.
Adjust the pickling parameters according to the type of metal and the degree of contamination to achieve the best treatment effect.
After pickling, it must be thoroughly rinsed and neutralized to ensure that there is no acid residue on the metal surface.
 

Key points of pickling treatment
Equipment selection: Select pickling tanks and auxiliary equipment made of corrosion-resistant materials to ensure the safety of the treatment process and the durability of the equipment.
 

Operation skills: Operators need to wear professional protective equipment, strictly abide by the operating procedures, and avoid direct contact with acid. At the same time, the concentration and temperature of the acid are regularly tested to ensure the treatment effect.
 

Safety matters: The pickling area should be well ventilated and equipped with necessary safety facilities and emergency treatment measures, such as neutralizers, flushing water sources, etc., to deal with possible acid leakage or splashing.

Taking a 304 stainless steel hardware product required by a customer as an example, a professional "stainless steel pickling passivation liquid" treatment solution is used to effectively prevent spots on the surface of the hardware, and the overall appearance is uniform silver-white, which not only improves product quality, but also significantly increases sales.
 

This customer case fully demonstrates the importance and effect of metal surface pickling in practical applications.
 

Pickling treatment of the surface of hardware is a complex and delicate process, and our operators have rich professional knowledge and practical experience. By mastering the basic principles, key techniques and operating points of pickling, the safety and effectiveness of the treatment process can be ensured, thereby improving the quality and market competitiveness of furniture hardware products.