{"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\/zh\/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\">\u4fdd\u5f62\u5857\u5c64<\/strong> is essential to ensure reliability and performance in <strong data-start=\"132\" data-end=\"148\">PCB \u7d44\u88dd<\/strong> \u548c <strong data-start=\"153\" data-end=\"169\">SMT \u7d44\u88dd<\/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\">\u4ea4\u9470\u5319 PCB \u7d44\u88dd<\/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\/zh\/pcb-%e8%a3%9d%e9%85%8d\/\"><strong data-start=\"722\" data-end=\"738\">PCB \u7d44\u88dd<\/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\">\u4fdd\u5f62\u5857\u5c64<\/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\">SMT \u7d44\u88dd<\/strong> lines for fast defect identification.<\/p>\n<p data-start=\"1094\" data-end=\"1195\"><strong data-start=\"1094\" data-end=\"1132\">AOI\uff08\u81ea\u52d5\u5149\u5b78\u6aa2\u6e2c\uff09<\/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\/zh\/%e4%ba%a4%e9%91%b0%e5%8c%99-pcb-%e8%a3%9d%e9%85%8d\/\"><strong data-start=\"1378\" data-end=\"1402\">\u4ea4\u9470\u5319 PCB \u7d44\u88dd<\/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\/zh\/%e4%bf%9d%e5%bd%a2%e5%a1%97%e5%b1%a4\/\"><strong data-start=\"2034\" data-end=\"2055\">\u4fdd\u5f62\u5857\u5c64<\/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\">PCB \u7d44\u88dd<\/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\/zh\/smt-%e7%b5%84%e8%a3%9d%e6%9c%8d%e5%8b%99\/\"><strong data-start=\"2630\" data-end=\"2646\">SMT \u7d44\u88dd<\/strong><\/a> processes<\/li>\n<\/ul>\n<p data-start=\"2660\" data-end=\"2674\"><strong data-start=\"2660\" data-end=\"2674\">\u7e3d\u7d50<\/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\">PCB \u7d44\u88dd<\/strong>, <strong data-start=\"2807\" data-end=\"2823\">SMT \u7d44\u88dd<\/strong>, \u4ee5\u53ca <strong data-start=\"2829\" data-end=\"2853\">\u4ea4\u9470\u5319 PCB \u7d44\u88dd<\/strong>, a robust inspection process ensures that <strong data-start=\"2896\" data-end=\"2917\">\u4fdd\u5f62\u5857\u5c64<\/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;\">\u53d6\u5f97\u4fdd\u5f62\u5857\u5c64\u5831\u50f9<\/h3>\n<p style=\"font-size: 15px; color: #555; margin-bottom: 15px;\">\u6e96\u5099\u597d\u958b\u59cb\u60a8\u7684\u4fdd\u5f62\u5857\u5c64\u5c08\u6848\u4e86\u55ce\uff1f\u8acb\u586b\u5beb\u4ee5\u4e0b\u8868\u683c\u958b\u59cb\u3002.<br \/>\n\u5c07\u60a8\u7684\u9700\u6c42\u50b3\u9001\u7d66\u6211\u5011\uff0c\u4e26\u7372\u5f97\u6211\u5011\u5de5\u7a0b\u5718\u968a\u7684\u5feb\u901f\u56de\u61c9\u3002.<\/p>\n<p style=\"font-size: 14px; color: #333; margin-bottom: 20px;\">24 \u5c0f\u6642\u56de\u61c9 \u2714 \u5de5\u7a0b\u652f\u63f4 \u2714 \u5c0f\u578b\u8207\u5927\u91cf\u751f\u7522<\/p>\n<\/div>\n<div style=\"text-align: left;\"><style id=\"wpforms-css-vars-2237\">\n\t\t\t\t#wpforms-2237 {\n\t\t\t\t--wpforms-field-size-input-height: 43px;\n--wpforms-field-size-input-spacing: 15px;\n--wpforms-field-size-font-size: 16px;\n--wpforms-field-size-line-height: 19px;\n--wpforms-field-size-padding-h: 14px;\n--wpforms-field-size-checkbox-size: 16px;\n--wpforms-field-size-sublabel-spacing: 5px;\n--wpforms-field-size-icon-size: 1;\n--wpforms-label-size-font-size: 16px;\n--wpforms-label-size-line-height: 19px;\n--wpforms-label-size-sublabel-font-size: 14px;\n--wpforms-label-size-sublabel-line-height: 17px;\n--wpforms-button-size-font-size: 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