Disposal (A) to reduce the amount of absorption of hydrogen in the metal to reduce high strength / high hardness steel bracket pickle because it can aggravate. Hydrogen embrittlement in steel oxide and try to blast the Rockwell hardness of 32 HRC or more fasteners for pickling, you must ensure that the fermentation process to develop a piece of a pickle. No longer than 10 minutes, and should try to reduce the concentration of acids and to ensure that part of the pickle does not exceed 10 minutes in degreasing use cleaners or solvents, and other chemicals. How many degreasing, degreasing, the permeability of hydrogen least if the electrical, chemical, cathode, anode, cathode of the first parts with high strength allows Electrolytic degreasing; During the heat treatment, strict control of injection volume of methanol and propane; Plated, alkaline water infiltration or high current efficiency. Less than the amount of hydrogen (2), hydrogen, lower resistance and spread of hydrogen solubility at low plating is generally believed that the chromium, zinc, cadmium, nickel, tin, lead, iron penetration of hydrogen is likely. to continue and Cu, Mo, Al, Ag, Au, W, and other metal coating which hydrogen dispersion and solubility, low resistance, low hydrogen permeability of hydrogen less. Meet the technical conditions necessary in a situation that can be used without causing hydrogen permeability of the coating such as zinc or chrome plated zinc, aluminum, embrittlement. No hydrogen corrosion resistance, good adhesion, and more. Power is environmentally friendly (3) to treat stress and hydrogen. embrittlement After plating to eliminate the risk if the parts. dehydroepiandrosterone After the fire, and other welding processes within large residual stress before plating should be tempered, tempering stress can actually reduce the internal parts. Traps, which reduces the risk of. embrittlement Hydrogen occurs ⑷ thickness of the coating, the coating covers the surface of the coating in the spring, one will play the role of hydrogen diffusion barrier which hinders the diffusion of hydrogen into the external mounting. When the thickness of the coating than 2.5μm hydrogen distribution from the spring is very difficult. So hardness <32HRC seize the thickness of the coating can be 12μm; Hardness 32HRC ≥ bolt coating thickness should be controlled in 8μmmax. This requires that the design must take into account the risk of hydrogen. embrittlement Of high-strength bolts are the proper choice of coating and thickness of the coating. [1]
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