The work aims to clarify the corrosion resistance and torque retention performance of 304 stainless steel bolts, galvanized bolts, galvanized passivated bolts, and Dacromet bolts in water conservancy project environments when combined with different plate and ingot materials under different treatment conditions, so as to provide experimental support for the reasonable selection and protection of bolts in engineering. Salt spray accelerated corrosion tests and torque tests were adopted to investigate the macroscopic morphological changes and torque retention rates of the four types of bolts combined with 304 stainless steel plates, Q355B carbon steel plates, 304 stainless steel ingots, and Q355B carbon steel ingots under the four treatment conditions: “with washers and grease”, “without washer but with grease”, “with washer but without grease” and “without washers and grease”. For plate combinations, Dacromet bolts exhibited the best corrosion resistance, with excellent torque retention performance under specific treatments (e.g., 304+304 combination with grease), but only acceptable performance without any treatment for 304+Q355B and Q355B+Q355B combinations. Galvanized bolts and galvanized passivated bolts suffered severe surface coating consumption due to the high Cl- environment and galvanic effect. The stainless steel bolts had good inherent corrosion resistance, but their torque retention rates were generally below the standard, and they accelerated the corrosion of connected carbon steel components. For ingot connections, stainless steel bolts showed good overall performance; Dacromet bolts combined with Q355B ingots achieved compliant torque retention when washers were added. The effects of washers and grease on the torque retention rates of different bolts varied significantly. The service performance of different types of bolts in water conservancy project environments is significantly affected by the connected materials and treatment conditions. Dacromet bolts have outstanding corrosion resistance in plate combinations, while stainless steel bolts have excellent comprehensive performance in ingot combinations. In engineering applications, bolt selection and supporting treatment methods should be optimized according to the actual connection scenarios to ensure the safety and durability of bolted structures.
Key words
hydraulic engineering /
bolts /
corrosion /
torque retention /
salt spray test /
stainless steel /
galvanizing /
Dacromet
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