Cailiao Baohu (Apr 2023)
Study on the Corrosion Resistance of Weathering High Strength Bolted Steel in Typical Industrial Atmospheric Environment
Abstract
In order to study the corrosion behavior of weathering high strength bolted steel in typical industrial atmospheric environment，samples compared with 35 VB bolts were taken from the industrial trial production of 10.9 grade weathering bolts to carry out the simulated periodic infiltration accelerated corrosion tests of typical industrial atmospheric environment for 24，48，96，168，and 216 hours.The corrosion behavior of high strength bolted steel with weathering resistance in simulated industrial atmosphere was studied by means of corrosion weight loss，XRD，SEM and electrochemical test.Results showed that the corrosion weight loss of both grade 10.9 and 35VB bolted steels increased with the prolongation of corrosion cycle，and the weight loss of grade 10.9 weathering bolted steel was significantly lower than that of grade 35VB bolted steel.With the prolongation of corrosion period，the diffraction peak strength of the corrosion products of the 10.9 grade weathering bolted steel and 35VB bolted steel increased，and the α-FeOOH phase diffraction peak was stronger in the 10.9 grade weathering bolted steel under the same corrosion period.Under the same period，compared with 35VB bolted steel，the self-corrosion potential of 10.9 grade weathering bolted steel was more positive，the self-corrosion current density was smaller，and the capacitance resistance arc was larger.The results indicated that the 10.9 grade weathering bolted steel with the addition of Cu，Cr and Ni alloy elements possessed excellent corrosion resistance in typical industrial atmospheric environment.
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