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← ScienceWhich risk increases when improperly torqued bolts join structural steel?
A)Fretting corrosion accelerates fracturing✓
B)Galvanic action increases spalling
C)Hydrogen embrittlement impairs welding
D)Thermally induced creep buckles plating
💡 Explanation
Fretting corrosion risks accelerating fracture; because minute cyclic relative motions degrade the passive oxide layers, therefore corrosion occurs on the freshly exposed metal surfaces rather than uniform corrosion; this effect weakens the joint integrity faster.
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