dye-penetrant method - definição. O que é dye-penetrant method. Significado, conceito
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O que (quem) é dye-penetrant method - definição

SURFACE BREAKING DEFECT INSPECTION METHOD
Liquid penetrant; Liquid penetrant testing; Dye penetrant

Dye penetrant inspection         
Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability.
Triarylmethane dye         
  • Bromocresol green reacts with acids and bases to give differently colored compounds
  • Friedel–Crafts synthesis of thymolphthalein
CLASS OF DYE
Triphenylmethane Dye; Triphenylmethane dye; Victoria blue dye
Triarylmethane dyes are synthetic organic compounds containing triphenylmethane backbones. As dyes, these compounds are intensely colored.
Substantive dye         
  • [[Direct Blue 1]].
  • [[Trypan blue]] (Direct Blue 14), which also exhibits medicinal properties.
  • [[Direct Blue 15]].
Representative direct dyes
WATER-SOLUBLE DYE THAT ADHERES TO A SUBSTRATE, USUALLY A TEXTILE MATERIAL OR LEATHER, WITHOUT THE USE OF A MORDANT
Direct dyes; Direct dye; Direct cotton dye; Direct cotton dyestuff
A substantive dye or direct dye is a dye that adheres to its substrate, typically a textile, by non-ionic forces.

Wikipédia

Dye penetrant inspection

Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components.