| 摘要 |
A corrosion protection method of connecting parts of bolts and nuts in a steel structure by sealing the crevices with a gel type sacrificial anode sealant after coating inner surfaces or crevices of the connecting parts of bolts and nuts with a corrosion inhibitor or injecting the corrosion inhibitor onto the inner surfaces or the crevices thereof, and a gel type sacrificial anode sealant that contains a high purity Zn anode powder, or a Zn- or Al-based alloy anode powder and is used conveniently in the same are provided. As a gel type sacrificial anode sealant of a Zn- or Al-based alloy, the sealant is prepared by mixing a high purity(99.99% or more) Zn anode powder of -1.05 volt(SCE) or less, or a fine powder of a Zn- or Al-based alloy anode with a liquid phase organic or inorganic binder at a mixing ratio of 1:1 to 1:1.5, wherein the Zn-based ally comprises 99.3% of Zn, 0.6% of Al and 0.1% of other components, the Al-based alloy comprises 95% of Al, 4.5% of Zn and 0.5% of other components, the other components are one or more elements selected from the group consisting of In, Si, Mg and Ca, and the sealant is a gel type sealant that can be conveniently used in corrosion protection of connecting parts of bolts and nuts in a steel structure and maintains a surface electric potential of -1,000 mV SCE or less during hardening.
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