In the field of electronic component manufacturing, ferrite magnetic rings are the core components of inductors and transformers, and their surface coating quality directly affects the product's weather resistance and service life. Through more than 20 years of industry practice, Xinrixu Electronic Materials Co., Ltd. in Xinhui District, Jiangmen City has summarized that the key to anti stripping paint technology lies in the surface treatment before painting and the scientific matching of materials, effectively solving the technical pain point of easy peeling of magnetic ring coatings.

In response to the porous characteristics of ferrite magnetic rings, New Rixu Electronics adopts a five step pretreatment system: insulation coating A=layout, B=front spraying, C=baking, D=back spraying, E=packaging
The self-developed nanoscale roughening solution can enlarge the micropores on the surface of the magnetic ring to 3-5 μ m for subsequent coating. After testing, the surface roughness Ra value of the processed magnetic ring reached 1.2-1.6 μ m, an increase of 40% compared to conventional treatment, and the coating adhesion exceeded 5B level.

The company uses epoxy resin insulation coating and achieves seamless bonding with ferrite by introducing materials such as epoxy resin and coupling agents. When cured at 150 ℃, a three-dimensional network structure is formed, which chemically crosslinks with the topcoat. This gradient protection system enables the magnetic ring to withstand salt spray for more than 2000 hours, and the wet heat cycle test reaches 50 cycles without detachment, which is three times longer than traditional processes.

Comparative tests at the Xinhui production base showed that untreated magnetic rings exhibited coating peeling of>5% after 10 cold and hot shocks (-40 ℃~125 ℃), while samples using the complete process only showed 0.3% edge microcracks after 30 shocks. This stability benefits from the synergistic effect of surface treatment and coating - the micro locking structure formed by pretreatment combined with the flexible deformation ability of the resin effectively buffers the thermal expansion difference between ferrite and coating.

Jiangmen Xinrixu has provided over 200 million high reliability magnetic ring products to multiple customers by building a complete technology chain of "pretreatment+material adaptation". Its process database covers 6 major categories of ferrite material characteristic parameters, and can customize coating solutions according to different application scenarios (automotive, industrial, consumer electronics), truly achieving a technological leap from short-term protection to long-term service of magnetic ring coatings.