| This experiment by flame thermal spraying in the AM50surface preparation Al-Si-Fe andAl/Al-Si-Fe and extrusion state coating, the use of thermal shock test coating bonding strength,using rockwell hardness tester on the coating surface macroscopic hardness testing, the use ofML-50abrasive wear testing machine, rotary sediment erosion wear testing machine andadhesive wear testing machine were tested four coating wear particle wear, erosion wear andadhesive wear ability. In3.5wt%acetic acid and3.5wt%of salt solution soak test its surfacecorrosion resistance ability, and by using electrochemical corrosion method test four kinds ofcoating of potential difference of potential. Use respectively by means of metallographicmicroscope in on microscopic observation coating and substrate between section, combined withscanning electron microscope observation coating organization and morphology, X ray analysiscoating things phase composition.The results show that, Contain transition layer of Al/Al-Si-Fe coating bonding strength is notransition layer Al-Si-Fe have significantly improved, but the coating performance promotioneffect is not big. X-ray analysis flame spraying system of coating which basic for α (Al), beta-Si, Al85Fe3.92Mn10.08Si, Al8Si6Mg3, Al3.21Si0.47, Al9Fe0.84Mn2.16Si, Al3.2Fe and phase composition,of which the second phase sort is more, extrusion of the things of the state is divided into eachother α (Al), β-Si, Al13(Fe, V)3Si, Al8FeMg3Si6, Al9Fe0.84mn2.16Si. Four kinds of coating wearparticle wear, erosion wear and adhesive wear and corrosion resistance of basically the sametrend, both for extrusion state higher than a transition layer of Al/Al-Si-Fe coating, Al/Al-Si-Fecoating higher than Al-Si-Fe coating, higher than the AM-50Mg alloy matrix. The magnesiumsubstrate from corrosion potential is1.565V, without passivation area, and the anode currentdensity has been as potential increases. Al-Si-Fe coating and Al-Si alloy extrusion state in3.5wt%of NaCl aqueous solution is obviously passivation area, including Al-Si-Fe coating inpassive zone, potential from0.65V to1.10V current basic remain unchanged, passivation currentdensity of0.75mA·cm-2; Al-Si alloy extrusion state passivation area potential range is0.70V to1.10V, passivation current density of0.7809mA·cm-2. |
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