Why Do Stainless Steel Screws Change Color

Sometimes stainless steel screws will change color, as a professional fastener manufacturer, Xinchi is happy to discuss with you how to avoid the discoloration of stainless steel screws.

Incomplete cleaning: In the process of cleaning after the screw hardening, if it is not completely cleaned, the cleaning liquid remains on the surface of the stainless steel screw, and the chemical reaction will cause discoloration with time.

Surface phosphating: The phosphating film on the screw surface may cause red rust to appear after quenching. To avoid screw discoloration, it is recommended that the phosphating film be removed before heat treatment and that the temperature in the furnace area be properly controlled.

After quenching water quenching material residue: stainless steel screws after quenching, if the water quenching material remains in the screw after a period of use will lead to the stainless steel screw’s rust resistance decline, a black situation. Therefore, during the application process, the residue of water-quenched substances should be checked regularly to prevent discoloration of the surface of stainless steel screws.

In short, avoiding the problem of discoloration of stainless steel screws requires uniform application of attention, control of the size of the locking force, selection of high-quality screws and nuts, and proper cleaning and surface treatment.

XINCHI is a trustworthy fastener company, especially in furniture nuts. We have a factory,  founded in 2007. And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  XINCHI can offer a wide range of high-quality fasteners, including nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.