Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 2

The influence of aging temperature on corrosion resistance of sintered 17-4 PH stainless steel

10.15199/28.2016.2.3

nr katalogowy: 97968
10.15199/28.2016.2.3

Among the precipitation hardening stainless steels, martensitic grade of 17-4 PH has a special importance. This steel exhibits a good combination of high mechanical properties and good corrosion resistance. Therefore it is widely used in many branches of industry. The pitting corrosion behaviour of sintered 17-4 PH steel processed under different aging processing conditions in 0.5 M NaCl solution at 25°C was studied by open circuit potential measurement and potentiodynamic polarization technique. Compared with the sintered 17-4 PH, the corrosion resistance of the solution treated and aged steels were improved, as evidenced by a noble shift in open circuit potential, a higher pitting potential, a higher polarization resistance and a lower passive current density. Considering the influence of aging temperature on the pitting behavior of the 17-4 PH steel, it can be concluded that steel aged at 480°C exhibited the highest corrosion resistance in 0.5 M NaCl solution. While aging treatment at 500°C resulted in the worst corrosion resistance. In addition, the hardness of the solution treated and aged 17-4 PH was higher than that of the sintered steel. Key words: 17-4 PH stainless steel, pitting corrosion, hardness.1. INTRODUCTION It is known that the corrosion destruction is one of the main sources of material loss. And furthermore it contributes to the pollution of the environment and even constitutes a risk to human health. The problem of materials durability in natural and artificial environments is extremely important from the viewpoint of design and also application of constructions, devices, tools and etc. The degradation of the materials and the environment as a result of corrosion can be effectively reduced by appropriate prevention, mainly by using methods of anticorrosive protection and adequate selection of materials. The steels containing at least 10.5 wt % chromium and other elements (such as nickel or molybdenum) are more resist[...]

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