Salt bath nitriding
SURSULF™ ARCOR™ TENIFER™ TUFFTRIDE™ QPQ OPO
Salt bath nitriding using sulphur activated non-contaminating salts for ferrous materials. SURSULF efficiently solves all wear, fatigue and seizure problems thanks to the exceptional nitriding qualities of the bath (thick diffusion layer, 100% epsilon nitrides in compound layer, compressive stresses in superficial layer, sulphur compounds layer).
Operating temperature of SURSULF is 540-570°C, 30-210 min. Because of high nitriding potential of the bath, it is possible to gain considerable hardness in such a short time. Formed compound layer is ductile and provides wear, seizure and fatigue resistance. As the result of its morphology, tribologic properties and corrosion resistance are improved.
SURSULF can be applied on the following materials:
- nonalloyed steel
- alloy steel (construction and tool)
- high speed cutting steel
- cast iron and steel
Unlike gas nitriding there's no need for chromium or aluminum presence in the steel.
- gears, toothed shafts, camshafts
- engine valves
- valve rockers
- worm gears
- cylinder sleeves
- threaders, drills, broaches
ARCOR is a treatment which combines thermochemical diffusion in molten salt bath with passivation and finishing treatment to produce a surface having exceptional resistance to wear, seizure, scuffing, corrosion and fatigue. The finishing treatments are of impregnation type with organic compounds. The parts treated with ARCOR have an excellent black decorative appearance. The ductility of surface layers enables excellent compatibility with mating surfaces. ARCOR also eliminates any risk of failure due to hydrogen embrittlement- a major problem encountered with many applied coatings.
Depending on the foreseen applications, the operating temperature varies from 540 to 570°C and the diffusion time from 90 to 120 min. The treatment produces duplex surface layer (compact and porous areas), consisting of epsilon nitrides and Fe, C, N, O compounds.
The corrosion resistance obtained by combination of passivation and finishing treatment is significantly superior to many conventional anticorrosion coatings (chromium, nickel, zinc, ...). The corrosion resistance may exceed 700 hours in salt spray test on simple parts and reaches easily 400h on components having welded or crimped assemblies.
The hardness of the compound layer in 600 to 800 HV range allows to effectively overcome the problem of wear. The impregnation and the surface finish lead to a substantial decrease of the coefficient of friction.
ARCOR is wide- spread in the following industries:
- civil engineering
- household apparatus