Anti corrosion coating controls tightening

A coating system developed by NOF Metal Coatings Group does just that. Geomet 500 is a self-lubricated coating which allows an average 8-10 µm thickness to reach 1000 hours corrosion resistance without red rust for fasteners treated in bulk using the dip-spin process. Thanks to its integral lubrication, the product is also beneficial in assembly and multi tightening. The value of coefficient of friction provided is between 0.12 and 0.18 without any additional topcoat, on a M10x55 hex-headed reference screw, tested according to ISO 16047. Today, Geomet 500 is specified by many manufacturers and OEMs in the automotive and heavy trucks sectors including PSA, Fiat, Iveco, Jaguar Land Rover, Bosch and Volvo Trucks. NOF's Plus VLh is a new solution to friction problems for cases of difficult tightening. The company says that for many years, one of the major standards of the German car industry has been the Plus VL applied onto a Geomet 321 coating, which combines good anticorrosion performance combined with tightening control. The current obligation to reduce vehicle weights in order to decrease CO2 emissions leads to widespread use of light alloys. The new Plus VLh topcoat improves performance linked to friction for difficult tightening cases, particularly for multitightening in aluminium and onto catophoretic paint. It is also effective in cases of loosening at high temperatures, while avoiding stick-slip problems when tightening. The topcoat can be applied in one application and can be used for many fasteners used by the German automotive industry. The technology is water-based and uses chemicals with low VOC content. Products are totally chromium free and anticipate the substitution of substances targeted by regulations, such as VHU and VOC directives as well as Reach regulations.