The Titanium Fasteners To Connect The Structure Of Contact Corrosion Behavior And Its Control Technology

All sorts of materials are co-used in aerial structure and contact with each other, so Crevice Corrosion and Galvanic Corrosion are important failure forms of aerial structure. Contact Corrosion behaviors between aerial Titanium Alloy Fasteners and its jointed structure are studied, but also the corresponding control projects are presented by Standard Crevice Corrosion Test, Standard Galvanic Corrosion Test, Electrochemical Polarization Test, Neutral Salt Spray Test and Alternate Immersion Test, and by analysis methods such as Scan Electron Microscope and X-ray Diffraction.The results show that Graphite Epoxy Composite Material (abbreviated to GECM) which under fasteners solidified with glass cloth, Contact Corrosion between Ti Alloy Fasteners and GECM is effectively controlled, the best assemblage of GECM is Impulse Anodized TC16 bolts jointing with Impulse Anodized TC16 nuts lubricated by MoS2.Stainless Steel nuts lCrl7Ni2 have both better corrosion resistances than 1Cr11Ni2W2MoV whether they are single one or jointed with Impulse Anodized TC16 bolt or Blue Anodized TC16 bolts, when jointed with anodized TC16 bolts, anodized LY12 nuts have better corrosion resistance than any kind of Stainless Steel nuts.Anodized LY12 sandwich materials with Aluminum clad have better corrosion resistance than that without Aluminum clad, the best assemblage of the sandwich materials is Aluminum-coating TC16 bolts jointed with anodized LY12 nuts.Structural steel 30CrMnSiA plating Cd have better corrosion resistance than that plating Zn, the best assemblage of the sandwich materials is Aluminum-coating TC16 bolts jointed with plating Cd 30CrMnSiA nuts.The galvanic corrosion factor is dominant in the contact corrosion between titanium alloy fasteners and Anodized LY12 or 30CrMnSiA.For Structural steel, Neutral Salt Spray Test has better consistency with Alternate Immersion Test, and Alternate Immersion Test has a heaver acceleration effect than Neutral Salt Spray, the former is applied to semi-industrial marine climate, the latter is applied to marine atmospheric environment.