Isolating Corrosion of Steel Plates Coupled With Titanium

Abstract

Over twenty six percent of the bridges in the United States are structurally deficient or functionally obsolete. Corrosion of steel used in structures like bridges and buildings is a problem that has gained increased interest and focused concern. Steel is often the metal that is preferred for use in such applications due to a synergism of ease of availability, acceptable mechanical properties and cost effectiveness. Through the years, titanium has grown in strength, stature and significance to be recognized as an emerging high performance metal that is both stronger and lighter than steel. A distinctive property of titanium and its alloys is its non-corrosive nature. However, a major drawback in the selection and use of pure titanium or its alloy counterpart is the prohibitively high cost. Therefore, it may be possible to combine steel and pure titanium and/or its alloy in structures by restricting steel for bulk of the structure and selectively using titanium and its alloys for the critical but low volume elements, such as, gusset plates and bearings. A hybrid use of titanium in conjunction with steel for structural members will result in better performance while concurrently proving to be both cost-effective and economically affordable. The synergistic use of structural steel and titanium in close proximity with each other could result in accelerated corrosion of steel in the immediate vicinity of titanium. The corrosion performance of titanium plates coupled with steel members is presented. A few viable strategies for minimizing galvanic coupling effects between steel and titanium are discussed. Corrosion experiments were conducted to measure the severity of corrosion when titanium and steel form a galvanic couple, and copper and steel was a comparative system. The study revealed that adequate precautions are needed to minimize localized corrosion when titanium gusset plates are coupled with structural steel members.

A Study on the Influence of Different Defect Types on the Corrosion Behavior of Q235/TA2 Composite Plates in a Marine Environment

“…Previous studies have extensively explored the corrosion behavior of these composite plates in marine environments [11][12][13], focusing on aspects such as surface corrosion, electrochemical behavior, and long-term stability. Li et al investigated the performance of 316L stainless steel and A6 carbon steel composite plates under neutral salt spray tests, observing significant elemental overlap at the composite interface [12].…”

“…Li et al investigated the performance of 316L stainless steel and A6 carbon steel composite plates under neutral salt spray tests, observing significant elemental overlap at the composite interface [12]. Patnaik et al indicated that the coupling of titanium with steel accelerates the corrosion of steel due to titanium's more noble position in the electrochemical series [13]. Prolonged exposure led to accelerated corrosion along the interface of A6 carbon steel components, surpassing the corrosion rate of the carbon steel matrix.…”

Fatigue Life Evaluation for Cracked Long-Span Continuous Pc Bridges

“…The deficiencies affect the durability and even influence the safety of structure. Previous and current research mainly focuses on the effect of cracks to the capacity of structures [1]. Reasons causing these deficiencies may be different from bridge to bridge, but changes of vehicle load and loss of pre-stressing are the most common and critical reasons.…”