A Study on Surface Modification of Al7075-T6 Alloy against Fretting Fatigue Phenomenon

Table 3

Effect of surface modification techniques on fretting damage.

Surface modification method	Decrease the coefficient of friction	Introduce compressive stress	Increase in hardness	Increase in surface roughness	Durability or adhesion	Economy	Mitigation of fretting wear	Mitigation of fretting fatigue
Nitriding	√	√ √	√ √	D	√ √	√	√	√
Electroplating (Cr, Ni, etc.)	D	××	√	D	×	√	√	××
Hard anodizing	D	×	√	D	√	—	√	D
Shot peening	×	√	√	√ √	—	√ √	√ √	√ √
Laser shock peening	D	D	D	√	××	√	D	√
Deep rolling	√	√ √	√	D	√ √	√ √	√	√ √
IBED hard film	√	√	√	××	√	××	√ √	√ √
PVD hard coating	√	D	√	×	D	×	√	D

D: depending on condition; ×: bad effect; √: good effect; √ √: very good effect, and ××: very bad effect.