Measuring paint or coating thickness on aluminium requires a different approach from measuring coatings on steel. Steel is normally a ferrous substrate, while aluminium is non-ferrous. For suitable coatings over aluminium and other compatible conductive non-ferrous substrates, an eddy current coating thickness gauge can provide fast, non-destructive measurements without cutting or damaging the finished coating. The TASI TA521A and TA522A Coating Thickness Gauges support both Fe and NFe measurement principles, making them useful for companies that need to inspect coatings on both steel and aluminium. Can You Measure Paint Thickness on Aluminium? Yes, provided that the coating and substrate are compatible with the instrument's measurement principle. A typical application can be represented as: Aluminium substrate → Non-conductive coating Examples may include suitable: Paint Powder coating Protective coatings Surface finishes For this type of application, the instrument can use the eddy current principle to determine coating thickness. This is different from the magnetic induction principle normally used for suitable coatings over ferrous steel. What Does NFe Mean? On a coating thickness gauge, NFe generally refers to the non-ferrous measurement mode. For the TASI TA521A and TA522A, the instrument uses the eddy current principle for compatible NFe substrates. A simple way to remember the difference is: Fe → Ferrous → Steel / Iron → Magnetic Induction NFe → Non-Ferrous → Aluminium and compatible conductive substrates → Eddy Current Understanding this difference is important because not every coating thickness gauge supports both measurement principles. What Is the Eddy Current Principle? Eddy current measurement uses an electromagnetic field generated by the instrument's probe. When the probe is positioned near a conductive non-ferrous substrate such as compatible aluminium, changes in the electromagnetic response can be used to determine the distance between the probe and the metal substrate. That distance corresponds to the thickness of the suitable non-conductive coating above the metal. The important benefit is that the coating does not need to be removed. This allows measurements to be taken directly on finished products. Magnetic Induction vs Eddy Current The two measurement principles solve different substrate requirements. Magnetic Induction Commonly used for: Non-magnetic coating → Ferrous metal Example: Paint → Steel Eddy Current Commonly used for: Non-conductive coating → Conductive non-ferrous metal Example: Paint → Aluminium For a company that works with both materials, a dual Fe/NFe instrument provides greater flexibility. TASI TA522A for Aluminium Coating Measurement The TASI TA522A provides: Measuring range: 02000 μm Stated accuracy: ±(3% + 1 μm) Fe magnetic induction measurement NFe eddy current measurement Automatic substrate recognition Manual measurement mode selection Fe+Zn measurement capability Zero calibration μm / mm / mil selectable units 2 readings per second 180° screen rotation This makes the TA522A suitable for a range of compatible industrial coating applications involving different metal substrates. Where Is Aluminium Coating Thickness Measurement Used? Potential applications include: Aluminium fabrication Window and door manufacturing Electrical enclosures Metal panels Machinery components Automotive components Equipment housings Architectural metal products Powder coating Manufacturing QC Incoming inspection Final inspection For manufacturers producing both steel and aluminium components, using one Fe/NFe instrument can simplify equipment selection. Powder Coating on Aluminium Powder coating is commonly associated with steel, but aluminium products can also be powder coated. Examples may include: Aluminium frames Panels Enclosures Architectural components Fabricated parts After curing, a compatible coating thickness gauge can be used to measure the finished coating non-destructively. The measurement can help QC personnel check whether coating thickness is consistent with the company's required specification. Why Coating Thickness Matters A coating may serve several purposes, such as: Appearance Corrosion protection Weather resistance Surface durability Chemical resistance Product finishing If the coating is below the specified thickness, the finished product may not meet its required coating specification. Applying unnecessarily thick coatings can also increase material consumption and production cost. For manufacturers, coating thickness measurement therefore provides useful process-control information. How to Measure Coating Thickness on Aluminium 1. Confirm the Substrate Make sure the underlying material is compatible with the instrument's NFe measurement principle. Do not select a measurement mode based only on the appearance of the finished component. 2. Understand the Coating Determine what coating is being measured. For eddy current measurement, the coating/substrate combination must be compatible with the measurement principle. 3. Prepare the Instrument Follow the manufacturer's instructions for zero calibration and instrument checks before measurement. 4. Position the Probe Correctly Place the probe against a suitable measurement location and keep it stable while obtaining the reading. 5. Take Multiple Measurements Measure several locations rather than relying on one reading. Coating thickness can vary across a component. 6. Compare With Your Requirement The instrument provides the thickness value. Whether that reading passes or fails depends on the relevant production specification, customer requirement or inspection procedure. Can You Use a Steel-Only Paint Gauge on Aluminium? Not if the instrument relies only on the magnetic induction principle. A ferrous-only coating thickness gauge requires a suitable magnetic substrate. Aluminium is non-ferrous. Therefore, users who need to inspect both steel and aluminium should look for an instrument supporting both: Fe + NFe This is one of the advantages of the TASI TA521A and TA522A. Can a Coating Thickness Gauge Measure Anodizing? This requires more careful consideration. The word “aluminium coating” can refer to very different surface treatments. Paint, powder coating and anodized layers are not automatically identical measurement applications. Before purchasing an instrument specifically for anodizing thickness measurement, provide details of: Substrate Surface treatment Expected thickness Measurement objective Applicable inspection requirement Instrument suitability should be confirmed for the specific application rather than assuming that every NFe gauge is appropriate for every aluminium surface treatment. What About Curved Aluminium Components? Surface geometry matters. A gauge may perform differently when used on: Small-diameter components Curved surfaces Narrow sections Edges Corners Thin components If the application involves unusual geometry, check the instrument's relevant measurement requirements before purchasing. For professional inspection, the actual component should ideally be considered during instrument selection. Automatic Fe/NFe Recognition Both the TA521A and TA522A can automatically recognize the appropriate substrate type for compatible applications. This can be useful in factories where QC personnel move between steel and aluminium products. For example: Steel enclosure → Fe Aluminium panel → NFe The operator does not need a separate instrument for each suitable substrate type. Why TA522A for Professional Users? TA521A already provides the core Fe/NFe measurement capabilities required for many general applications. TA522A provides additional manual measurement mode selection. This can be useful when the operator already knows the substrate and performs repeated measurements on the same material. For this reason: TA521A → General / straightforward measurement TA522A → Professional / repetitive industrial QC Their core stated measurement accuracy remains the same. Applications in Malaysian Manufacturing Aluminium coating measurement can be relevant to companies involved in: Aluminium fabrication Powder coating Electrical manufacturing Metal finishing Building products Automotive components Machinery Engineering products Factory QC Supplier inspection For these companies, a coating thickness gauge can be used for incoming material inspection, production checks or final QC depending on the company's procedures. Common Mistakes Assuming Aluminium Uses the Same Principle as Steel Steel generally requires Fe magnetic induction measurement, while compatible aluminium applications use NFe eddy current measurement. Buying an Fe-Only Gauge If aluminium needs to be measured, make sure the instrument supports NFe. Assuming Every Surface Treatment Can Be Measured Always confirm the specific coating/substrate combination. Measuring Only One Location Multiple measurements provide more useful information about coating consistency. Ignoring Surface Geometry Small, curved or unusual components may require additional consideration. FAQ What type of coating thickness gauge is used for aluminium? For suitable non-conductive coatings over compatible conductive non-ferrous substrates such as aluminium, an eddy current coating thickness gauge is commonly used. What does NFe mean on a coating thickness gauge? NFe refers to non-ferrous measurement. In the TASI TA521A/TA522A series, compatible NFe applications use the eddy current measurement principle. Can TASI TA522A measure paint on aluminium? Yes, for suitable coating/substrate combinations within the instrument's specifications. Can TA522A measure powder coating on aluminium? It can be used for suitable powder coating measurements over compatible aluminium substrates within its measurement capabilities. What is the TA522A measuring range? The specified general measurement range is 02000 μm. Can the same TA522A measure steel? Yes. TA522A supports both Fe magnetic induction and NFe eddy current measurement. Can an Fe-only gauge measure aluminium? Generally no. An Fe-only magnetic induction instrument requires a suitable ferrous substrate. Which TASI model is better for factory QC? Both TA521A and TA522A provide Fe/NFe measurement. For repetitive professional QC, we generally recommend the TA522A because of its additional manual measurement mode control. Looking for an Aluminium Coating Thickness Gauge in Malaysia? If you need to measure coatings on aluminium, tell us: What is the aluminium component? What coating or surface treatment is applied? What thickness range do you expect? Is the measurement for production QC, incoming inspection or final inspection? MTM Precision can help evaluate the application and recommend a suitable coating thickness gauge. For companies working with both steel and aluminium, the TASI TA521A and TA522A provide dual Fe/NFe measurement capability in one portable instrument. Contact MTM Precision MTM Precision Sdn Bhd No. 29-1 & 29-2, Jalan Bandar 18 Pusat Bandar Puchong 47160 Puchong, Selangor, Malaysia Website: www.mtmpre.com.my WhatsApp: +6016-660 7346 Email: mtmpre@yahoo.com