Avoidance of Hydrogen Embrittlement During Rust Removal
This article documents the avoidance of hydrogen embrittlement during rust removal process. It also documents the difference between Vappro VBCI MRST 812 and Magna 114 a conventional acid-based rust remover. It features the advantages of using Vappro VBCI MRST (Molecular Reaction Surface Technology) during rust removal process over the conventional acid-based rust remover.
Commercially, Sulfuric, Hydrochloric and Phosphoric acids are common acids used in rust removal process. Sulfuric acid shows lower hydrogen embrittlement rates at lower temperatures but it has low rust removing capability, thus it is typically used at around 60°C. At this temperature, sulfuric acid shows hydrogen embrittlement rate similar to that of hydrochloric acid. Phosphoric acid is also similar.
The embrittlement of a metal or alloy by atomic hydrogen involves the ingress of hydrogen into a component, an event that can seriously reduce the ductility and loadbearing capacity, cause cracking and catastrophic brittle failures at stresses below the yield stress of susceptible materials. Hydrogen embrittlement occurs in a number of forms but the common features are an applied tensile stress and hydrogen dissolved in the metal. Examples of hydrogen embrittlement are cracking of weldments or hardened steels when exposed to conditions which inject hydrogen into the component.
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