{"id":5233,"date":"2026-04-14T15:22:36","date_gmt":"2026-04-14T07:22:36","guid":{"rendered":"https:\/\/txjpcba.com\/?p=5233"},"modified":"2026-04-14T15:22:36","modified_gmt":"2026-04-14T07:22:36","slug":"how-to-detect-coating-defects","status":"publish","type":"post","link":"https:\/\/txjpcba.com\/fr\/how-to-detect-coating-defects\/","title":{"rendered":"How to detect coating defects?"},"content":{"rendered":"<h2 data-start=\"0\" data-end=\"33\"><strong data-start=\"0\" data-end=\"33\">Detect coating defects<\/strong><\/h2>\n<p data-start=\"35\" data-end=\"387\">Detecting defects in <strong data-start=\"56\" data-end=\"77\">Rev\u00eatement conforme<\/strong> is essential to ensure reliability and performance in <strong data-start=\"132\" data-end=\"148\">Assemblage du circuit imprim\u00e9<\/strong> et <strong data-start=\"153\" data-end=\"169\">Assemblage SMT<\/strong>. Even small coating issues can lead to moisture ingress, corrosion, or electrical failure. A combination of inspection methods is typically used in <strong data-start=\"318\" data-end=\"342\">Assemblage de circuits imprim\u00e9s cl\u00e9s en main<\/strong> to identify and control defects effectively.<\/p>\n<figure id=\"attachment_5235\" aria-describedby=\"caption-attachment-5235\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5235\" src=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-detect-coating-defects.jpg\" alt=\"How to detect coating defects\" width=\"800\" height=\"597\" srcset=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-detect-coating-defects.jpg 800w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-detect-coating-defects-300x224.jpg 300w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-detect-coating-defects-768x573.jpg 768w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-detect-coating-defects-16x12.jpg 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-5235\" class=\"wp-caption-text\">How to detect coating defects<\/figcaption><\/figure>\n<p data-start=\"389\" data-end=\"500\"><strong data-start=\"389\" data-end=\"425\">Visual inspection (basic method)<\/strong><br data-start=\"425\" data-end=\"428\" \/>The simplest way to detect coating defects is through visual inspection:<\/p>\n<ul data-start=\"502\" data-end=\"652\">\n<li data-section-id=\"1dzfc3t\" data-start=\"502\" data-end=\"543\">Use proper lighting and magnification<\/li>\n<li data-section-id=\"33p63i\" data-start=\"544\" data-end=\"598\">Check for uneven coating, bubbles, or missed areas<\/li>\n<li data-section-id=\"o8nr2\" data-start=\"599\" data-end=\"652\">Identify overcoating on connectors or test points<\/li>\n<\/ul>\n<p data-start=\"654\" data-end=\"755\">Although basic, this method is still widely used as a first step in <a href=\"https:\/\/txjpcba.com\/fr\/assemblage-de-circuits-imprimes\/\"><strong data-start=\"722\" data-end=\"738\">Assemblage du circuit imprim\u00e9<\/strong><\/a> quality control.<\/p>\n<p data-start=\"757\" data-end=\"860\"><strong data-start=\"757\" data-end=\"801\">UV light inspection (most common method)<\/strong><br data-start=\"801\" data-end=\"804\" \/>Many <strong data-start=\"809\" data-end=\"830\">Rev\u00eatement conforme<\/strong> materials include UV tracers:<\/p>\n<ul data-start=\"862\" data-end=\"988\">\n<li data-section-id=\"cqo6ro\" data-start=\"862\" data-end=\"894\">Coating glows under UV light<\/li>\n<li data-section-id=\"1jztn5x\" data-start=\"895\" data-end=\"932\">Missing or thin areas appear dark<\/li>\n<li data-section-id=\"1xvpiq7\" data-start=\"933\" data-end=\"988\">Easy detection of coverage issues and contamination<\/li>\n<\/ul>\n<p data-start=\"990\" data-end=\"1092\">This is one of the most efficient techniques in <strong data-start=\"1038\" data-end=\"1054\">Assemblage SMT<\/strong> lines for fast defect identification.<\/p>\n<p data-start=\"1094\" data-end=\"1195\"><strong data-start=\"1094\" data-end=\"1132\">AOI (Inspection optique automatis\u00e9e)<\/strong><br data-start=\"1132\" data-end=\"1135\" \/>AOI systems provide automated and highly accurate detection:<\/p>\n<ul data-start=\"1197\" data-end=\"1340\">\n<li data-section-id=\"rons90\" data-start=\"1197\" data-end=\"1242\">Detects insufficient or excessive coating<\/li>\n<li data-section-id=\"4e5q90\" data-start=\"1243\" data-end=\"1293\">Identifies bubbles, voids, and inconsistencies<\/li>\n<li data-section-id=\"1vl948k\" data-start=\"1294\" data-end=\"1340\">Compares results with programmed standards<\/li>\n<\/ul>\n<p data-start=\"1342\" data-end=\"1437\">AOI is commonly used in high-volume <a href=\"https:\/\/txjpcba.com\/fr\/assemblage-de-circuits-imprimes-cle-en-main\/\"><strong data-start=\"1378\" data-end=\"1402\">Assemblage de circuits imprim\u00e9s cl\u00e9s en main<\/strong><\/a> for consistent inspection results.<\/p>\n<p data-start=\"1439\" data-end=\"1464\"><strong data-start=\"1439\" data-end=\"1464\">Thickness measurement<\/strong><\/p>\n<p data-start=\"1466\" data-end=\"1533\">Defects are not always visible\u2014thickness control is also important:<\/p>\n<ul data-start=\"1535\" data-end=\"1683\">\n<li data-section-id=\"17kfowo\" data-start=\"1535\" data-end=\"1577\">Use wet film gauges during application<\/li>\n<li data-section-id=\"18j4giz\" data-start=\"1578\" data-end=\"1625\">Use dry film measurement tools after curing<\/li>\n<li data-section-id=\"q7pjqd\" data-start=\"1626\" data-end=\"1683\">Ensure coating falls within typical range (25\u2013250 \u00b5m)<\/li>\n<\/ul>\n<p data-start=\"1685\" data-end=\"1770\">Incorrect thickness can lead to performance issues even if coverage looks acceptable.<\/p>\n<p data-start=\"1772\" data-end=\"1809\"><strong data-start=\"1772\" data-end=\"1809\">Functional and electrical testing<\/strong><\/p>\n<p data-start=\"1811\" data-end=\"1861\">Some coating defects only appear during operation:<\/p>\n<ul data-start=\"1863\" data-end=\"2005\">\n<li data-section-id=\"ytss8d\" data-start=\"1863\" data-end=\"1896\">Insulation resistance testing<\/li>\n<li data-section-id=\"u9slxx\" data-start=\"1897\" data-end=\"1948\">High-voltage testing (for leakage or breakdown)<\/li>\n<li data-section-id=\"jjqctq\" data-start=\"1949\" data-end=\"2005\">Environmental stress testing (humidity, temperature)<\/li>\n<\/ul>\n<p data-start=\"2007\" data-end=\"2099\">These tests verify whether <a href=\"https:\/\/txjpcba.com\/fr\/revetement-conforme\/\"><strong data-start=\"2034\" data-end=\"2055\">Rev\u00eatement conforme<\/strong><\/a> is performing correctly in real conditions.<\/p>\n<p data-start=\"2101\" data-end=\"2139\"><strong data-start=\"2101\" data-end=\"2139\">Common coating defects to look for<\/strong><\/p>\n<ul data-start=\"2141\" data-end=\"2324\">\n<li data-section-id=\"19ugpah\" data-start=\"2141\" data-end=\"2166\"><strong data-start=\"2143\" data-end=\"2164\">Bubbles and voids<\/strong><\/li>\n<li data-section-id=\"m0f5w1\" data-start=\"2167\" data-end=\"2194\"><strong data-start=\"2169\" data-end=\"2192\">Cracking or peeling<\/strong><\/li>\n<li data-section-id=\"165wx1v\" data-start=\"2195\" data-end=\"2215\"><strong data-start=\"2197\" data-end=\"2213\">Delamination<\/strong><\/li>\n<li data-section-id=\"1rsu3vs\" data-start=\"2216\" data-end=\"2250\"><strong data-start=\"2218\" data-end=\"2248\">Shadowing (uncoated areas)<\/strong><\/li>\n<li data-section-id=\"82r0oh\" data-start=\"2251\" data-end=\"2288\"><strong data-start=\"2253\" data-end=\"2286\">Overcoating on critical parts<\/strong><\/li>\n<li data-section-id=\"9v47fd\" data-start=\"2289\" data-end=\"2324\"><strong data-start=\"2291\" data-end=\"2322\">Contamination under coating<\/strong><\/li>\n<\/ul>\n<p data-start=\"2326\" data-end=\"2400\">Early detection helps reduce rework and improve yield in <strong data-start=\"2383\" data-end=\"2399\">Assemblage du circuit imprim\u00e9<\/strong>.<\/p>\n<p data-start=\"2402\" data-end=\"2441\"><strong data-start=\"2402\" data-end=\"2441\">Best practices for defect detection<\/strong><\/p>\n<ul data-start=\"2443\" data-end=\"2658\">\n<li data-section-id=\"1ygsxy2\" data-start=\"2443\" data-end=\"2502\">Combine multiple inspection methods (UV + AOI + visual)<\/li>\n<li data-section-id=\"13aw78d\" data-start=\"2503\" data-end=\"2553\">Standardize inspection criteria and procedures<\/li>\n<li data-section-id=\"pgw4df\" data-start=\"2554\" data-end=\"2596\">Train operators and maintain equipment<\/li>\n<li data-section-id=\"1448fz6\" data-start=\"2597\" data-end=\"2658\">Integrate inline inspection in <a href=\"https:\/\/txjpcba.com\/fr\/services-dassemblage-smt\/\"><strong data-start=\"2630\" data-end=\"2646\">Assemblage SMT<\/strong><\/a> processes<\/li>\n<\/ul>\n<p data-start=\"2660\" data-end=\"2674\"><strong data-start=\"2660\" data-end=\"2674\">Conclusion<\/strong><\/p>\n<p data-start=\"2676\" data-end=\"3002\">Detecting coating defects requires a combination of visual, UV, automated, and functional inspection methods. In <strong data-start=\"2789\" data-end=\"2805\">Assemblage du circuit imprim\u00e9<\/strong>, <strong data-start=\"2807\" data-end=\"2823\">Assemblage SMT<\/strong>, et <strong data-start=\"2829\" data-end=\"2853\">Assemblage de circuits imprim\u00e9s cl\u00e9s en main<\/strong>, a robust inspection process ensures that <strong data-start=\"2896\" data-end=\"2917\">Rev\u00eatement conforme<\/strong> is applied correctly, preventing failures and improving overall product reliability.<\/p>\n<div style=\"background: #f8f8f8; border: 1px solid #e5e5e5; padding: 25px; margin-top: 30px; border-radius: 6px;\">\n<div style=\"text-align: center;\">\n<h3 style=\"margin-bottom: 10px; font-size: 22px;\">Obtenir un devis pour un rev\u00eatement conforme<\/h3>\n<p style=\"font-size: 15px; color: #555; margin-bottom: 15px;\">Pr\u00eat \u00e0 d\u00e9marrer votre projet de rev\u00eatement conforme ? 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aria-describedby=\"wpforms-2237-field_2-description\" ><\/textarea><div id=\"wpforms-2237-field_2-description\" class=\"wpforms-field-description\">\"Please list components or areas that must NOT be coated (e.g., connectors, test points).\" If you have specific coating material requirements (e.g., HumiSeal), Please indicate this in the comment box.<\/div><\/div><script>\n\t\t\t\t( function() {\n\t\t\t\t\tconst style = document.createElement( 'style' );\n\t\t\t\t\tstyle.appendChild( document.createTextNode( '#wpforms-2237-field_3-container { position: absolute !important; overflow: hidden !important; display: inline !important; height: 1px !important; width: 1px !important; z-index: -1000 !important; padding: 0 !important; } #wpforms-2237-field_3-container input { visibility: hidden; } #wpforms-conversational-form-page #wpforms-2237-field_3-container label { counter-increment: none; }' ) );\n\t\t\t\t\tdocument.head.appendChild( style 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#888; margin-top: 15px; text-align: center;\">Shenzhen Tengxinjie Electronics Co. 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