Steel structure corrosion protection, automotive paint, window tint, galvanizing, PCB conformal coating, anodising, intumescent fireproofing, pipe and hull wall thickness — for each scenario: which principle applies, which standard governs, and how to do it in the field.
Acceptance of steel structure protective coatings is governed by SSPC-PA 2-2022 for spot count and pass/fail rules, and by ASTM D7091-22 for instrument operation. What a contractor needs is the…
Automotive paint inspection uses an Fe/NFe dual-mode coating thickness gauge: it first auto-switches principle by substrate (steel or aluminium), then judges from the deviation of readings against the same-model baseline…
The US has no federal tint standard; front-side-window visible light transmittance (VLT) is set by each state, most commonly 35%, strictest 70%; because factory driver-vision glass is itself about 70%…
The hot-dip galvanizing industry expresses coating mass as “weight g/m2”, while a gauge gives a length unit; the two convert by zinc density (about 7.14 g/cm3, i.e. 1 μm zinc…
The conformal coating on a printed circuit board sits over copper traces and glass-fibre substrate; copper is a non-magnetic conductive metal and the coating is non-conductive, so measurement must use…
The anodic oxide layer is an insulating oxide grown in place on the aluminium surface, with a clean interface and no primer interference — the ideal eddy current target (ISO…
Intumescent fireproofing on steel structures runs from several hundred micrometres to several millimetres, far beyond ordinary painting, so a wide-range magnetic gauge is the mainstream choice; the English term must…
Wall thickness of pipes, boilers and pressure vessels is measured by ultrasonic pulse-echo: from outside the equipment, the round-trip sound time is converted to wall thickness, to assess corrosion rate…
Hull, yacht and offshore structure thickness surveys share one problem: the surface already has a full anti-corrosion coating, and grinding means repair. Echo-Echo through-coating mode measures the steel substrate wall…
Floor coatings, wood finishes and plastic-part painting share one trait: the substrate is neither magnetic nor conductive, so magnetic and eddy current methods both fail; such scenarios must use an…
