Influence of hot-dip coatings on mechanical and corrosion behaviors of steel bolts
Keywords:Bolts, Corrosion, Hot dip galvanizing, Torque, Twist angle
Steel is the main type of materials used in construction applications. Steel bolt, in particular, is used for fastening all the structural components together, and hence high durability in terms of the mechanical and corrosion resistance is inevitably critical. Carbon steel shows adequate mechanical strength, yet it is highly susceptible to corrosion. On the other hand, stainless steel is praised for its remarkable corrosion resistance, yet its relatively low yield stress exhibits a drawback. Hot-dip coating which provides Fe-Zn or Zn-Ni compounds in the coating interface could potentially mitigate the shortcomings of carbon steel and stainless steel by providing improved corrosion protection, without compromising the mechanical integrity. A study is performed in this work to systematically compare the performance of carbon steel, stainless steel, steels with Fe-Zn and with Zn-Ni protective layers prepared with hot-dip procedures, for the fastener applications. Torsion and hardness tests were conducted to assess the mechanical properties, and the salt spray test was applied to characterize the susceptibility to red rust formation. Microstructure of the samples is examined carefully to analyze the rigidity of the coatings and to explain the corresponding behaviors of the materials.
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