We are considering rust prevention treatment for small extension coil springs made of SW-C and SWP-B, but we don’t know about the surface treatment of the adjacent part of the extension springs made of electroless nickel plating, copper plating, and trivalent chromate? Will it permeate to the closed-contact area without any problem? I look forward to hearing from you.
Thank you for writing to us, Spring Newbie!
It seems that the coating on the closed-contact coil part of the extension spring does not permeate. To apply the paint completely, make some space between the coils at the manufacturing stage, or if it is not possible to make space due to the initial tension, make a space with a jig to separate the coils when painting the springs. I think painting is the only solution here.
If surface treatment (rust prevention) is not required for the closed-contact parts, what kind of method does your company apply, especially for extension springs with many closed-contact parts? I think that there is no problem with SUS, but in the case of SW-C and SWP-B, is it coiled after rust prevention treatment? Please describe it as a manual designed by our company.
Hello! If the springs are used in a corrosive environment, they will be designed with stainless steel materials. Also, if the materials can only be selected with general spring steel due to stress factors, the springs will be painted after coiling, so we make some space between the coils at the design stage.
