求翻译：浓度较低时，段塞流动冲刷剪切力造成表层剥离，加剧材料质量损失。浓度较高时，表面产物膜厚且疏松，发生点蚀或坑蚀等局部腐蚀；是什么意思？

At lower concentrations , slug flow shear stress caused by surface erosion stripped exacerbated material loss of quality.

Density is low, the flushing flow shear force caused by surface stripping, increasing quality of material losses. Higher density, product surface film thickness, and osteoporosis, pitting or corrosion pits, local corrosion.

When the density is low, the slug flow washout shearing force creates the surface layer peeling, the aggravating material mass defect.When the density is high, the superficial product membrane is thick also is loose, has the pitting or the pit eclipse and so on the localized corrosion;

Concentration is low, the slug flow scouring surface peeling caused by shear increased mass loss of material. Concentration is high, the surface film thickness and loose, localized corrosion such as pitting or corrosion;

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