2025 г. 3 юни Седмица WBM News Препоръка - Увреждане на водород и напукване

With ductile metals, such as low carbon steel, the material can easily deform and the reduction in strength isn't terribly significant. Figure 3 shows a piece of SAE 1020 steel with a series of blisters that are about a quarter inch in diameter and are filled with hydrogen. It was part of some chemical process equipment and wasn't highly stressed so the blisters didn't cause any problems, but larger blisters can cause reduced пластичност .

However, as steel is processed to become stronger, it almost always becomes less ductile and the effect of the atomic hydrogen becomes more critical. Figure 4 shows the magnified fracture of a steel spring used in a piece of pharmaceutical equipment. The bottom of this HRC 50 spring was rusted, the result of the cleaning process and a poor machine design. Looking at the crack face, the Корозията при произхода е лесно видима и металургичният анализ потвърждава, че водородът е участвал .

Знаем, че напукване на водород е резултат от комбинация от метална химия, температура, стрес и време . Въпреки това, единственият начин със сигурност да знаете дали водородът е допринесъл за неуспех, е частта да се анализира за съдържанието на водород, но няма твърдо и бързо правило за това, че корозията има върху причиняването на повредите.

One of my first lessons about the effect of corrosion involved a $200,000 roller bearing in one of our machines. This was before the era of predictive maintenance, and we had removed it from position and opened it up to inspect the condition of the contact surfaces. The cause of the problem was that, after removing it from a very dirty environment, we had washed it with hot water that managed to get past the seals. So, when we opened the bearing there were a series of black marks on the inner and outer rings, and Figure 5 is a microscope's view of the marks. They are corrosion pits and the technical staff from the bearing manufacturer told us that the hydrogen from the pitting had reduced the L10 life of the bearing to 10–20 percent of the Оригинал .

Черните белези по пътя на контакт на лагера на подвижен елемент са почти винаги симптоми на корозия, които значително ще намалят живота на топката и валяк . със сходни механизми за стрес и втвърдени стомани, корозията също ще намали живота на зъбите на предавката и компонентите на веригата .