Thermal diffusivity of corrosion-resistant coating SDP-1

In the present work, the thermal diffusivity of the SDP-1 grade nickel alloy was investigated in the wide temperature range of 300-1476 K. The SDP-1 alloy (Ni-Co-Cr-Al-Y) is the heat-resistant coating for blades of gas turbine plants, providing protection against sulfide-oxide corrosion in the temperature range of 1070-1220 K. The measurements were performed by laser flash method using LFA-427 apparatus. The estimated errors of the obtained data were 2-5% depending on temperature. The thermal diffusivity approximation equations and a table of reference values for various scientific and practical applications were obtained.

METHOD FOR PASSENGER RESERVED SEAT CAR LIFE INCREASE

In the paper there is considered a car basic bearing element – center sill which because of long operation is subjected to corrosion destruction (on surface and in depth). The elimination of such corrosion spots mechanically is not effective and results in local decrease of a unit thickness and also in some cases in through corrosion. The authors of the paper have carried out investigations in places where intensive corrosion took place. For this there were cut out four fragments of the center sill and carried out etching-out and measuring residual stresses and a deformation value from etching depth of each fragment through Davidenkov’s method and CNIITMach’s procedure. As a result of the investigation carried out there is offered a fulfillment of center sill strengthening in the area of intermediate and end girder welding by means of shot cleaning in these areas, and also by additional corrosion resistant coating application on these surfaces. The investigations are carried out through Davidenkov’s method and on the basis of CNIITMach’s procedure. The work novelty: there are defined conditions for corrosion spot formation and technology is developed to ensure units life increase. According to the results of the investigations carried out there is made a conclusion: for the purpose of decrease and exclusion of corrosion processes and service life increase of both the center sill and a car in the whole it is necessary to carry out strengthening center sill elements in the areas of intermediate and end girders welding by means of the shot cleaning fulfillment in these places, and also an additional corrosion resistant coating application on these areas.

On the problems of creating shells of fuel rods from zirconium alloys for tolerant fuel

Three directions of the establishment of accident tolerant fuel cladding for light water reactors are actively exploring at present: 1) replacement zirconium alloy E110 for more corrosion-resistant material in accident operation conditions; 2) surface dispersion hardening or doping of the zirconium cladding of fuel element; 3) deposition a corrosion-resistant coating to the fuel cladding. The first direction requires significant and irreversible changes in fuel rod production technology and has long-term prospects. Conversely, the second direction suggest minimal changes in the fuel rod production technology, however, it has no significant effect on the high temperature oxidation kinetics of fuel claddings in steam. Using of a corrosion resistant coating results in a significant change in the high temperature oxidation kinetics of the zirconium alloy, (no transition to linear oxidation) that is related to maintaining the continuity of the oxide layer formed during oxidation. The issue provides a brief overview of the current state of research in the field of fuel, tolerant to the effects of coolant in emergency situations.

Corrosion resistance of a self-cleaning surface fabricated by one-step electrodeposition of dodecyltrimethoxysilane on magnesium alloy AZ31

A superhydrophobic and corrosion-resistant coating with hierarchical macro/nanostructures was constructed by one-step electrodeposition of dodecyltrimethoxysilane (e-DTMS) on Mg alloy AZ31 in a relatively neutral media. The surface morphology and chemical...