{"id":5261,"date":"2026-04-15T14:00:42","date_gmt":"2026-04-15T06:00:42","guid":{"rendered":"https:\/\/txjpcba.com\/?p=5261"},"modified":"2026-04-15T14:00:42","modified_gmt":"2026-04-15T06:00:42","slug":"how-to-test-coating-quality","status":"publish","type":"post","link":"https:\/\/txjpcba.com\/ar\/how-to-test-coating-quality\/","title":{"rendered":"How to test coating quality?"},"content":{"rendered":"<h2 data-section-id=\"gsdmb0\" data-start=\"0\" data-end=\"30\">Test coating quality<\/h2>\n<p data-start=\"32\" data-end=\"319\">Testing coating quality is a critical step in ensuring the reliability of <strong data-start=\"106\" data-end=\"127\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong> \u0641\u064a <strong data-start=\"131\" data-end=\"147\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong> \u0648 <strong data-start=\"152\" data-end=\"168\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong>. Proper inspection and testing help verify that the coating provides effective protection against moisture, dust, chemicals, and environmental stress.<\/p>\n<figure id=\"attachment_5262\" aria-describedby=\"caption-attachment-5262\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5262\" src=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-test-coating-quality.jpg\" alt=\"How to test coating quality\" width=\"800\" height=\"597\" srcset=\"https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-test-coating-quality.jpg 800w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-test-coating-quality-300x224.jpg 300w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-test-coating-quality-768x573.jpg 768w, https:\/\/txjpcba.com\/wp-content\/uploads\/2026\/04\/How-to-test-coating-quality-16x12.jpg 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-5262\" class=\"wp-caption-text\">How to test coating quality<\/figcaption><\/figure>\n<h3 data-section-id=\"1m1ft8s\" data-start=\"321\" data-end=\"342\">Visual inspection<\/h3>\n<p data-start=\"344\" data-end=\"403\">Visual inspection is the most basic and widely used method.<\/p>\n<p data-start=\"405\" data-end=\"423\"><strong data-start=\"405\" data-end=\"423\">What to check:<\/strong><\/p>\n<ul data-start=\"424\" data-end=\"568\">\n<li data-section-id=\"1yns6or\" data-start=\"424\" data-end=\"452\">Uniform coating coverage<\/li>\n<li data-section-id=\"mecukt\" data-start=\"453\" data-end=\"496\">Absence of bubbles, cracks, or pinholes<\/li>\n<li data-section-id=\"1nn5v7x\" data-start=\"497\" data-end=\"538\">No contamination or foreign particles<\/li>\n<li data-section-id=\"5bqvqg\" data-start=\"539\" data-end=\"568\">Proper masking boundaries<\/li>\n<\/ul>\n<p data-start=\"570\" data-end=\"676\">Under normal or magnified light, inspectors can quickly identify obvious defects in <a href=\"https:\/\/txjpcba.com\/ar\/%d8%b7%d9%84%d8%a7%d8%a1-%d9%85%d8%b7%d8%a7%d8%a8%d9%82\/\"><strong data-start=\"654\" data-end=\"675\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong><\/a>.<\/p>\n<h3 data-section-id=\"1rgw8cb\" data-start=\"678\" data-end=\"695\">UV inspection<\/h3>\n<p data-start=\"697\" data-end=\"753\">Many <strong data-start=\"702\" data-end=\"723\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong> materials contain UV tracers.<\/p>\n<p data-start=\"755\" data-end=\"767\"><strong data-start=\"755\" data-end=\"767\">Process:<\/strong><\/p>\n<ul data-start=\"768\" data-end=\"842\">\n<li data-section-id=\"o9v3jf\" data-start=\"768\" data-end=\"794\">Expose PCB to UV light<\/li>\n<li data-section-id=\"1fhdtx7\" data-start=\"795\" data-end=\"842\">Coating fluoresces, making coverage visible<\/li>\n<\/ul>\n<p data-start=\"844\" data-end=\"857\"><strong data-start=\"844\" data-end=\"857\">Benefits:<\/strong><\/p>\n<ul data-start=\"858\" data-end=\"951\">\n<li data-section-id=\"1f5oxoi\" data-start=\"858\" data-end=\"898\">Detects missed areas or thin coating<\/li>\n<li data-section-id=\"14sk09d\" data-start=\"899\" data-end=\"951\">Improves inspection accuracy in <strong data-start=\"933\" data-end=\"949\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong><\/li>\n<\/ul>\n<h3 data-section-id=\"1t55vlm\" data-start=\"953\" data-end=\"978\">Thickness measurement<\/h3>\n<p data-start=\"980\" data-end=\"1027\">Coating thickness is essential for performance.<\/p>\n<p data-start=\"1029\" data-end=\"1041\"><strong data-start=\"1029\" data-end=\"1041\">Methods:<\/strong><\/p>\n<ul data-start=\"1042\" data-end=\"1177\">\n<li data-section-id=\"je540r\" data-start=\"1042\" data-end=\"1086\">Wet film thickness gauge (before curing)<\/li>\n<li data-section-id=\"16l9djo\" data-start=\"1087\" data-end=\"1136\">Dry film thickness measurement (after curing)<\/li>\n<li data-section-id=\"nsf6a0\" data-start=\"1137\" data-end=\"1177\">Micrometer or ultrasonic measurement<\/li>\n<\/ul>\n<p data-start=\"1179\" data-end=\"1280\">Proper thickness ensures optimal protection without affecting component function in <strong data-start=\"1263\" data-end=\"1279\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong>.<\/p>\n<h3 data-section-id=\"1g42ihv\" data-start=\"1282\" data-end=\"1302\">Adhesion testing<\/h3>\n<p data-start=\"1304\" data-end=\"1366\">Adhesion testing checks how well the coating bonds to the PCB.<\/p>\n<p data-start=\"1368\" data-end=\"1387\"><strong data-start=\"1368\" data-end=\"1387\">Common methods:<\/strong><\/p>\n<ul data-start=\"1388\" data-end=\"1432\">\n<li data-section-id=\"1mabuii\" data-start=\"1388\" data-end=\"1415\">Cross-hatch (tape) test<\/li>\n<li data-section-id=\"1x3tibm\" data-start=\"1416\" data-end=\"1432\">Scratch test<\/li>\n<\/ul>\n<p data-start=\"1434\" data-end=\"1502\">Good adhesion ensures long-term durability of <strong data-start=\"1480\" data-end=\"1501\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong>.<\/p>\n<h3 data-section-id=\"scd02m\" data-start=\"1504\" data-end=\"1526\">Electrical testing<\/h3>\n<p data-start=\"1528\" data-end=\"1575\">Electrical performance must not be compromised.<\/p>\n<p data-start=\"1577\" data-end=\"1595\"><strong data-start=\"1577\" data-end=\"1595\">Tests include:<\/strong><\/p>\n<ul data-start=\"1596\" data-end=\"1671\">\n<li data-section-id=\"ytss8d\" data-start=\"1596\" data-end=\"1629\">Insulation resistance testing<\/li>\n<li data-section-id=\"por5k\" data-start=\"1630\" data-end=\"1671\">Dielectric withstand (Hi-Pot) testing<\/li>\n<\/ul>\n<p data-start=\"1673\" data-end=\"1744\">These confirm that the coating enhances insulation in <a href=\"https:\/\/txjpcba.com\/ar\/%d8%ae%d8%af%d9%85%d8%a7%d8%aa-%d8%aa%d8%ac%d9%85%d9%8a%d8%b9-%d8%a7%d9%84%d8%b3%d9%85%d8%a8%d8%aa%d9%8a%d9%83\/\"><strong data-start=\"1727\" data-end=\"1743\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong><\/a>.<\/p>\n<h3 data-section-id=\"1h383xv\" data-start=\"1746\" data-end=\"1787\">Environmental and reliability testing<\/h3>\n<p data-start=\"1789\" data-end=\"1857\">For high-reliability applications, environmental tests are required.<\/p>\n<p data-start=\"1859\" data-end=\"1872\"><strong data-start=\"1859\" data-end=\"1872\">Examples:<\/strong><\/p>\n<ul data-start=\"1873\" data-end=\"1952\">\n<li data-section-id=\"13ia9kh\" data-start=\"1873\" data-end=\"1896\">Temperature cycling<\/li>\n<li data-section-id=\"7pqbev\" data-start=\"1897\" data-end=\"1917\">\u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u0631\u0637\u0648\u0628\u0629<\/li>\n<li data-section-id=\"1lzcqkk\" data-start=\"1918\" data-end=\"1952\">Salt spray (corrosion) testing<\/li>\n<\/ul>\n<p data-start=\"1954\" data-end=\"2043\">These tests simulate real-world conditions to validate <strong data-start=\"2009\" data-end=\"2030\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong> performance.<\/p>\n<h3 data-section-id=\"11ydqis\" data-start=\"2045\" data-end=\"2083\">\u0627\u0644\u0641\u062d\u0635 \u0627\u0644\u0628\u0635\u0631\u064a \u0627\u0644\u0622\u0644\u064a (AOI)<\/h3>\n<p data-start=\"2085\" data-end=\"2162\">\u0641\u064a \u0645\u0631\u062d\u0644\u0629 \u0645\u062a\u0642\u062f\u0645\u0629 <a href=\"https:\/\/txjpcba.com\/ar\/%d8%aa%d8%ac%d9%85%d9%8a%d8%b9-%d8%ab%d9%86%d8%a7%d8%a6%d9%8a-%d8%a7%d9%84%d9%81%d9%8a%d9%86%d9%8a%d9%84-%d9%85%d8%aa%d8%b9%d8%af%d8%af-%d8%a7%d9%84%d9%83%d9%84%d9%88%d8%b1\/\"><strong data-start=\"2097\" data-end=\"2113\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong><\/a>, AOI systems are used to detect coating defects.<\/p>\n<p data-start=\"2164\" data-end=\"2179\"><strong data-start=\"2164\" data-end=\"2179\">Advantages:<\/strong><\/p>\n<ul data-start=\"2180\" data-end=\"2276\">\n<li data-section-id=\"zg1fki\" data-start=\"2180\" data-end=\"2205\">High-speed inspection<\/li>\n<li data-section-id=\"vu6yis\" data-start=\"2206\" data-end=\"2243\">Consistent and repeatable results<\/li>\n<li data-section-id=\"piy2el\" data-start=\"2244\" data-end=\"2276\">Suitable for mass production<\/li>\n<\/ul>\n<h3 data-section-id=\"bvl6vm\" data-start=\"2278\" data-end=\"2313\">Common coating defects detected<\/h3>\n<ul data-start=\"2315\" data-end=\"2416\">\n<li data-section-id=\"88xt6l\" data-start=\"2315\" data-end=\"2335\">Uneven thickness<\/li>\n<li data-section-id=\"16uayvd\" data-start=\"2336\" data-end=\"2357\">Bubbles and voids<\/li>\n<li data-section-id=\"1k5wic3\" data-start=\"2358\" data-end=\"2374\">Delamination<\/li>\n<li data-section-id=\"118bbc\" data-start=\"2375\" data-end=\"2398\">Incomplete coverage<\/li>\n<li data-section-id=\"spzv60\" data-start=\"2399\" data-end=\"2416\">Contamination<\/li>\n<\/ul>\n<p data-start=\"2418\" data-end=\"2470\">Early detection prevents failures in final products.<\/p>\n<h3 data-section-id=\"8ep03t\" data-start=\"2472\" data-end=\"2492\">\u0627\u0644\u0627\u0633\u062a\u0646\u062a\u0627\u062c \u0627\u0644\u0646\u0647\u0627\u0626\u064a<\/h3>\n<p data-start=\"2494\" data-end=\"2833\">Testing coating quality is essential in <strong data-start=\"2534\" data-end=\"2550\">\u062a\u062c\u0645\u064a\u0639 \u062b\u0646\u0627\u0626\u064a \u0627\u0644\u0641\u064a\u0646\u064a\u0644 \u0645\u062a\u0639\u062f\u062f \u0627\u0644\u0643\u0644\u0648\u0631<\/strong> \u0648 <strong data-start=\"2555\" data-end=\"2571\">\u062a\u062c\u0645\u064a\u0639 SMT<\/strong> to ensure the effectiveness of <strong data-start=\"2603\" data-end=\"2624\">\u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/strong>. By combining visual inspection, UV inspection, thickness measurement, adhesion testing, and environmental testing, manufacturers can guarantee high reliability and long-term protection of electronic devices.<\/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;\">\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631 \u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642<\/h3>\n<p style=\"font-size: 15px; color: #555; margin-bottom: 15px;\">\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0645\u0634\u0648\u0631\u0629 \u0627\u0644\u062e\u0628\u0631\u0627\u0621 \u0648\u0627\u0644\u0623\u0633\u0639\u0627\u0631 \u0627\u0644\u0645\u0646\u0627\u0633\u0628\u0629 \u0644\u0627\u062d\u062a\u064a\u0627\u062c\u0627\u062a\u0643 \u0645\u0646 \u0627\u0644\u0637\u0644\u0627\u0621 \u0627\u0644\u0645\u0637\u0627\u0628\u0642 \u0627\u0644\u064a\u0648\u0645.<br \/>\n\u0623\u0631\u0633\u0644 \u0644\u0646\u0627 \u0645\u062a\u0637\u0644\u0628\u0627\u062a\u0643 \u0648\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0633\u0631\u064a\u0639\u0629 \u0645\u0646 \u0641\u0631\u064a\u0642\u0646\u0627 \u0627\u0644\u0647\u0646\u062f\u0633\u064a.<\/p>\n<p style=\"font-size: 14px; color: #333; margin-bottom: 20px;\">\u2714 \u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u0639\u0644\u0649 \u0645\u062f\u0627\u0631 24 \u0633\u0627\u0639\u0629 \u2714 \u062f\u0639\u0645 \u0647\u0646\u062f\u0633\u064a \u2714 \u062f\u0639\u0645 \u0647\u0646\u062f\u0633\u064a \u2714 \u0625\u0646\u062a\u0627\u062c \u0635\u063a\u064a\u0631 \u0648\u0636\u062e\u0645<\/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: 17px;\n--wpforms-button-size-height: 41px;\n--wpforms-button-size-padding-h: 15px;\n--wpforms-button-size-margin-top: 10px;\n--wpforms-container-shadow-size-box-shadow: none;\n\t\t\t}\n\t\t\t<\/style><div class=\"wpforms-container wpforms-container-full wpforms-render-modern\" id=\"wpforms-2237\"><form id=\"wpforms-form-2237\" class=\"wpforms-validate wpforms-form wpforms-ajax-form\" data-formid=\"2237\" method=\"post\" enctype=\"multipart\/form-data\" action=\"\/ar\/wp-json\/wp\/v2\/posts\/5261?wpforms_form_id=2237\" data-token=\"47794fe5061ff8bf306df2be65ba7e0f\" data-token-time=\"1776371385\" data-trp-original-action=\"\/ar\/wp-json\/wp\/v2\/posts\/5261?wpforms_form_id=2237\"><noscript class=\"wpforms-error-noscript\">Please enable JavaScript in your browser to complete this form.<\/noscript><div id=\"wpforms-error-noscript\" style=\"display: none;\">Please enable JavaScript in your browser to complete this form.<\/div><div class=\"wpforms-field-container\"><div id=\"wpforms-2237-field_12-container\" class=\"wpforms-field wpforms-field-layout\" data-field-type=\"layout\" data-field-id=\"12\"><div class=\"wpforms-field-layout-rows wpforms-field-large\"><div class=\"wpforms-layout-row\"><div class=\"wpforms-layout-column wpforms-layout-column-50\"><div id=\"wpforms-2237-field_0-container\" class=\"wpforms-field wpforms-field-name\" data-field-type=\"name\" data-field-id=\"0\"><label class=\"wpforms-field-label\" for=\"wpforms-2237-field_0\">\u0627\u0644\u0627\u0633\u0645 <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"text\" id=\"wpforms-2237-field_0\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][0]\" aria-errormessage=\"wpforms-2237-field_0-error\" required><\/div><\/div><div class=\"wpforms-layout-column wpforms-layout-column-50\"><div id=\"wpforms-2237-field_1-container\" class=\"wpforms-field wpforms-field-email\" data-field-type=\"email\" data-field-id=\"1\"><label class=\"wpforms-field-label\" for=\"wpforms-2237-field_1\">\u0627\u0644\u0628\u0631\u064a\u062f \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"email\" id=\"wpforms-2237-field_1\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][1]\" spellcheck=\"false\" aria-errormessage=\"wpforms-2237-field_1-error\" required><\/div><\/div><\/div><\/div><\/div><div id=\"wpforms-2237-field_11-container\" class=\"wpforms-field wpforms-field-text\" data-field-type=\"text\" data-field-id=\"11\"><label class=\"wpforms-field-label\" for=\"wpforms-2237-field_11\">\u0648\u0627\u062a\u0633 \u0622\u0628<\/label><input type=\"text\" id=\"wpforms-2237-field_11\" class=\"wpforms-field-medium\" name=\"wpforms[fields][11]\" aria-errormessage=\"wpforms-2237-field_11-error\" ><\/div><div id=\"wpforms-2237-field_10-container\" class=\"wpforms-field wpforms-field-radio wpforms-list-3-columns\" data-field-type=\"radio\" data-field-id=\"10\"><fieldset><legend class=\"wpforms-field-label\">\u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u0645\u0641\u0636\u0644\u0629<\/legend><ul id=\"wpforms-2237-field_10\"><li class=\"choice-1 depth-1\"><input type=\"radio\" id=\"wpforms-2237-field_10_1\" name=\"wpforms[fields][10]\" value=\"Acrylic (AR)\" aria-errormessage=\"wpforms-2237-field_10_1-error\"  ><label class=\"wpforms-field-label-inline\" 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