Coatings - for load bearing parts such as bolts and screws, various coatings combine visual aesthetics with corrosion resistance and functional performance.

Corrosion is unavoidable. However, its nature, occurrence and progress can be greatly influenced by the use of coatings. Depending on the application and the environmental conditions, there are various highly effective coatings available for corrosion protection.

Highly qualified Job coaters apply all of the KAMAX coatings with state of the art equipment.

Corrosion resistance

Highly sophisticated testing devices are used to check the corrosion protection properties of coatings for both development and quality assurance purposes. These tests are performed in accordance with test procedure VDA 235-102, DIN 50 021 SS or DIN EN ISO 6988, including thermal cycling.

Protection against chemical attack, (e.g. by chemical cleaners), can be achieved by applying duplex coatings consisting of an organic topcoat or a silicate based sealer on a cathodically protective base coat.

Fasteners used with light alloy components require careful selection of the coating in order to avoid galvanic corrosion. For example, Zinc/aluminum flake coatings are suitable for fastening aluminum joints, whereas, silicate based sealers act as an insulating layer for fastening magnesium joints.

Functional performance

The functional and tightening properties of fasteners are greatly influenced by the achievement of constant coefficients of friction, even at increased temperatures.

KAMAX can supply coatings that achieve the required torque / clampload relationship per VDA test procedure 235-101 (µ_tot 0.09-0.14). The coefficient of friction depends on surface finish, thread dimensions, under head geometry, and can be optimized by additional lubrication or lubricants integrated into the coating system.