Material Selection Considerations for CO2 Sequestration Projects Material Selection Process
Material selection is primarily a process of short-listing technically acceptable materials for an application and then selecting the most
Material selection is primarily a process of short-listing technically acceptable materials for an application and then selecting the most
cost-effective one, bearing in mind the required operational life.
cost-effective one, bearing in mind the required operational life. This is often a multivariable process that might require several iterations before an optimal solution can be obtained. Part of this process should also assess which systems require material optimisation and which can use standard material selection guidelines. The process of standard material selection includes the following steps:
• •
define the requirements and the environment;
assess applicability of carbon steel and define possible corrosion control options;
• make materials choices;
Internal Environments Table 3 summarises the information necessary to perform material selection for commonly encountered environments. The information
Table 2: Preferential Corrosion of Weld Regions in Carbon Steels Potential Problem
Identified Causes
Preferential corrosion of weld, weld root and HAZ in carbon steel systems
The susceptibility to preferential weld corrosion increases with weld consumables that deposit ~1 %
Ni. It also increases with increased Si content and/or alloying with Cr or Mo. Factors directly influencing this are: • electrochemical properties of the materials and any corrosion cell forming around the weld joint;
• liquid film thickness and conductivity; • temperature and tendency to form corrosion product scales;
• corrosion inhibitor selection and effectiveness; and • flow-induced shear stress. Local turbulence at weld root might prevent inhibitor filming: limit bead penetration to the minimum that can be practically deposited. Use the worst case penetration welds that would be accepted in flow loop selection tests to ensure that the inhibitor can protect the welds. Fillers with minor alloying additions of Cu or Ni
might offer some protection against CO2 corrosion at normal temperatures. Above ~700°C less protective scale might be formed on the weld if alloyed fillers are used. This requires laboratory evaluation.
• •
develop a corrosion management strategy; and assess the economics of choices.
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