New combinations in Lactifluus, 2 : L. subg. Gerardii

In this second of a series of three papers, new combinations in the genus Lactifluus are proposed. This paper treats Lactarius subg. Gerardii (proposed here as new combination in Lactifluus). In this subgenus 17 combinations at species level are proposed

New combinations in Lactifluus, 1 : L. subgenera Edules, Lactariopsis, and Russulopsis

In this first of a series of three papers, new combinations in the genus Lactifluus are proposed. This paper treats the subgenera Edules, Lactariopsis, and Russulopsis (all proposed here as new combinations in Lactifluus). In Lactifluus subg. Edules, eight combinations at species level are proposed. In Lactifluus subg. Lactariopsis, the following three new combinations are proposed at sectional level: Lactifluus sect. Lactariopsis with seven newly combined species, L. sect. Chamaeleontini with eight newly combined species, and L. sect. Albati with four newly combined species plus two species previously combined in Lactifluus. Finally, in L. subg. Russulopsis, eight new combinations at species level are proposed

Electrochemical assessment of the self-healing properties of cerium doped sol-gel coatings on 304L stainless steel substrates

The present work aims at assessing the corrosion behavior of 304L stainless steel substrates pre-treated with 3-glicidoxypropyltrimethoxy silane (GPTMS) solutions modified with cerium nitrate or cerium oxide nanoparticles. Furthermore, the work aims at evaluating the self-healing properties of the dopant in intact and artificially scratched silane films via natural salt spray tests, electrochemical impedance spectroscopy (EIS) and d.c. potentiodynamic polarization. The morphological features of the coated substrates were evaluated by atomic force microscopy (AFM) and optical microscopy. The results confirmed the formation of transparent cerium modified sol-gel films without any defect and cracks and revealed the formation of a comparatively smooth nanostructure surface with a small heterogeneity in coating thickness in the sol-gel coatings modified with Ce(NO3)3.6H2O. Corrosion tests indicated that the CeO2 nanoparticles have good corrosion inhibition properties on scratched surfaces due to their ability to complex other species, therefore contributing for the stabilization of the passive film. In this way, these particles display an anodic inhibition mechanism. It was found that the positive impact, both in the barrier properties and corrosion inhibition, was significantly improved by modifying the silane solution with cerium nitrate. Presence of cerium nitrate, reinforces the barrier properties of the silane films, reducing the corrosion activity and self-healing the corroded areas

Russula vinosoflavescens sp. nov., from deciduous forests of Northern Alsace, France

Based on morphological, molecular, and ecological data, a new species of Russula sect. Russula, found on several occasions under deciduous trees in Northern Alsace is described and illustrated as: Russula vinosoflavescens, belonging to R. subsect. Sardoninae

The impact of hydrogen on the ductility loss of bainitic Fe–C alloys

The influence of hydrogen on the mechanical properties of generic lab-cast Fe-C bainitic alloys is studied by tensile tests on notched samples. The bainitic microstructure is induced in a 0.2% C and 0.4% C Fe-C alloy by an appropriate heat treatment. The hydrogen embrittlement susceptibility is evaluated by mechanical tests on both in situ hydrogen pre-charged and uncharged specimens. The observed ductility loss of the materials is correlated with the present amount of hydrogen and the hydrogen diffusion coefficient. In addition to the correlation between the amount of hydrogen and the hydrogen-induced ductility loss, the hydrogen diffusion during the tensile test, quantified by the hydrogen diffusion distance during the test, appears to be of major importance as well

Electrochemical hydrogen charging of duplex stainless steel

This study evaluates the electrochemical hydrogen charging behavior and interaction between hydrogen and the microstructure of a duplex stainless steel. A saturation level of approximately 650 wppm is reached after 10 d of charging. The data are compared with a model resulting in a diffusion coefficient of 2.1 x 10(-14) m(2)/s. A two-step increase of the concentration is observed and ascribed to saturation of ferrite followed by charging of austenite grains. Microstructural changes are observed during charging, i.e., formation and interaction of dislocations, as a result of the high residual stresses inherent to the production process of duplex stainless steels

FeS corrosion products formation and hydrogen uptake in a sour environment for quenched & tempered steel

Surface corrosion product formation is one of the important factors affecting the corrosion rate and hydrogen uptake in a H2S environment. However, it is still unclear how the base material composition will affect the corrosion products that are generated, and consequently their impact on the corrosion rate. In this paper, corrosion product formation and the impact of the Mo content of the base material on the composition of the corrosion products and hydrogen absorption in a sour environment was investigated. The corrosion layer was composed of a double layered mackinawite (FeS1−x) structure, which was enriched with molybdenum and chromium. The layers were formed via two different mechanisms, i.e., the inner layer was created via a general oxide film formation corrosion mechanism, whereas the upper layer was formed by a precipitation mechanism. The presence of this double corrosion layer had a large influence on the amount of diffusible hydrogen in the materials. This amount decreased as a function of contact time with the H2S saturated solution, while the corrosion rate of the materials shows no significant reduction. Therefore, the corrosion products are assumed to act as a physical barrier against hydrogen uptake. Mo addition caused a decrease in the maximal amount of diffusible hydrogen