6 hours at the latest 4 hours after the electroplating treatment. If an electroplated coating is nevertheless to be applied, the parts must be annealed at approx. In general, galvanic coating should not be applied at all in order to exclude the risk of hydrogen embrittlement fracture. If the component hardness exceeds 320 HV or the tensile strength Rm exceeds 1,000 MPa, the manufacturing process must be checked using a hydrogen embrittlement detection test. *Passivation is only possible for zinc or cadmium coatings. Yellowish shimmering to yellow-brown, iridescent Table 3: Post-treatment and passivation by chromating *The thicknesses specified for the first and second coating metals apply to all combinations of coatings with the exception that chromium is the top layer, which always has a thickness of 0.3 µm.
#Din en iso 4042 code#
*The ISO classification code is in ISO 1456 The use of cadmium is restricted in certain countries Sliding layer to reduce the insertion torque of thread-forming screws. Protection against high friction (galling). Tempering must be carried out immediately after the galvanic treatment.įorm friction-reducing and wear-inhibiting layers. However, according to the current state of the art, this process does not offer a 100% guarantee. 180☌ to 230☌ (below the tempering temperature). Hydrogen can be partially eliminated by tempering at approx. In the case of electroplated fasteners made of steels with tensile strengths Rm ≥ 1,000 N/mm² or hardness ≥ 320 HV which are under tensile stress, there is a risk of failure due to hydrogen embrittlement. Significant improvement in corrosion resistance. Subsequent oiling improves corrosion protection.Įspecially for nickel-plated parts, post-treatment in dewatering fluid with wax additive can seal the micropores with wax. For decorative purposes only light corrosion protection. The glass beads act as a carrier for the zinc powder grains and bring them to the workpiece surface, where they adhere by cold welding.Ĭhemical process for sharpening stainless steels for decorative purposesĬhemical process, bath temperature approx. Degreased parts are placed in a plating drum together with a special mixture of glass beads and zinc powder.
Applicable for threads ≥ M4Ĭhemo-mechanical plating process. In this coating process, hydrogen-induced embrittlement is excluded by process engineering. Ensure thread runnability by suitable measures.Įxcellent high zinc coating (silver-gray color) for parts with tensile strength Rm ≥ 1,000 N/mm² (strength classes ≥10.9, hardness ≥ 300 HV). Very good corrosion protection.Īpplicable for threaded parts from M8. Surface matt and rough, staining possible after a short time. For decorative purposes, virtually any color shade can be achieved.ĭipping in zinc bath, the temperature of which is approx. Thermal post-treatment is not possible.Īnodic oxidation creates a protective layer on aluminum that acts as a corrosion inhibitor and prevents staining. Tin plating is mainly used to achieve or improve the solderability (soft solder). Silver orders are used for decorative and technical purposes. Often used as an intermediate layer before nickel, chrome and silver plating. Steel parts are often brass plated to improve the adhesion of rubber to steel. Matte chrome plating: matt gloss (silk gloss).īrass plating is mainly used for decorative purposes. 4 µm Chrome has a decorative effect, increases the tarnish resistance of nickel-plated workpieces and improves corrosion protection. Mostly after nickel plating, layer thickness approx. Improvement of corrosion protection by impregnation.
Nickel-plated iron parts are not recommended for outdoor use. Especially for screws no abrasion of the coating. Because of the hard layer, application in the construction of electrical apparatus, as well as in the telephone industry. the fluid with which the threaded parts are in contact, temperature, pressure, etc.).Serves both decorative purposes and corrosion protection. Such plugs may be used together with seal rings as specified in DIN 7603, the type and material of which are to be selected as a function of the operating conditions (e.g.
#Din en iso 4042 pdf#
DIN 908 pdf standard screw plug Jun 06, 2019ĭIN 908 is Internal drive screw plugs with collar - Cylindrical threadĭIN 908 stainless steel material, M 16 thread tightening torque data and ISO equivalent.ĭIN 908 standard specifies dimensions, masses and technical delivery conditions for screw plugs which are intended to be screwed into holes with parallel thread as specified in DIN 13-5, DIN 13-6 or DIN 13-7, and DIN EN ISO 228-1.