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March 23 - April 7, 2017

When we use field splice plate connections on structural steel projects, how do we prevent rust and rust staining at bolt heads and at the splice plate/steel interface?

Selected Answers

From Larry Muzia of Exceletech Coating & Applications, LLC on December 13, 2017:
Inorganic zinc-rich coatings are a very good choice for one-coat protection on faying surfaces to include bolt holes. In addition, the application of a high performance caulk on overlapping connections can eliminate water ingress into the annular space. Galvanized bolts and/or zinc-tumbled bolts can be a good choice and should be properly overcoated after erection using a coating system that will obtain a sufficient level of edge protection.

From Tom Schwerdt of TxDOT on December 12, 2017:
Use a coating meeting your slip requirements. Ensure all structural steel is coated, including your faying surfaces and inside the bolt holes (typically primer only.) Use galvanized bolts and nuts. Require repair coating of any cutoffs or installation damage.

From Rahil Shaikh of Link Middle East LLC on November 21, 2017:
Follow the given process to protect the bolt head from rust: pickling - rinsing - flux solution - drying - hot dip galvanising.

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Tagged categories: Bolts; Coating Application; Corrosion; Structural steel

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