{"id":2111,"date":"2025-04-03T03:26:10","date_gmt":"2025-04-03T03:26:10","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=2111"},"modified":"2025-08-05T07:51:38","modified_gmt":"2025-08-05T07:51:38","slug":"pcb-surface-treatment-process-the-dual-mission-of-protection-and-functionality","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/pcb-surface-treatment-process-the-dual-mission-of-protection-and-functionality\/","title":{"rendered":"PCB Surface Treatment Process: the Dual Mission of Protection and Functionality"},"content":{"rendered":"<p><span data-font-family=\"default\">Printed Circuit Boards (<a href=\"https:\/\/blogs.lcsc.com\/blog\/printed-circuit-boards-pcbs-an-in-depth-overview\/\">PCB<\/a>s) are the backbone of modern electronics, enabling electrical connections between components. However, the exposed copper traces on a PCB\u2019s surface are vulnerable to oxidation, corrosion, and mechanical wear, which can degrade performance over time. Surface treatment process addresses these challenges by coating the copper with protective layers while ensuring reliable solderability. This article explores the key surface finishing techniques, their mechanisms, applications, and future trends. <\/span><\/p>\n<h2><b><span data-font-family=\"default\">Primary Purpose of Surface Treatment Process<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">Copper, while an excellent conductor, reacts readily with oxygen and moisture, forming non-conductive oxides (e.g., CuO or Cu\u2082O). These oxides hinder soldering and compromise electrical integrity. Surface finishes serve a three-fold role: <\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">Anti-Oxidation Protection<\/span><\/b><span data-font-family=\"default\">: Copper material easily reacts with oxygen in the air to generate copper oxide, which will reduce the quality of soldering. Surface treatment can effectively prevent oxidation.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Improve Solderability<\/span><\/b><span data-font-family=\"default\">: By forming a uniform protective layer, the pads have better wettability and adhesion during the soldering process. Furthermore, it ensures solderability.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Improve Corrosion Resistance<\/span><\/b><span data-font-family=\"default\">: The surface coating blocks moisture, acid, alkali, and other corrosive substances in the environment, prolonging the lifespan.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"default\">Common Types<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"default\">HASL (Hot Air Solder Leveling)<\/span><\/b><span data-font-family=\"default\">: <\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">The PCB is immersed in molten solder (leaded or <a href=\"https:\/\/blogs.lcsc.com\/blog\/european-union-directives-on-hazardous-substances-rohs-and-reach\/\">lead-free<\/a>) and then blown flat with hot air to form a tin\/lead or tin-based coating. HASL process is a low-cost, proven process with good solderability. It may not be suitable for fine-pitch or high-density packages due to the chance of an uneven surface created by the solder as it cools.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"a2a75998\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODI1ODYxNzU1NA_59182_sjUS_HLhfHCAARUS_1743417941?w=554&amp;h=406&amp;type=image\/png\" alt=\"Lead-free PCB surface treatment process that represents an improvement over the traditional HASL\" width=\"400\" height=\"293\" \/><figcaption class=\"wp-caption-text\">Lead-free PCB surface treatment process that represents an improvement over the traditional HASL (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<ul>\n<li><b><span data-font-family=\"default\">ENIG (Electroless Nickel Immersion Gold)<\/span><\/b><span data-font-family=\"default\">: <\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">The process first deposits a layer of nickel on the surface of the PCB by an electroless method and then utilizes a displacement reaction to form a layer of gold on top of the nickel layer. This treatment provides a very flat surface suitable for fine pitch and BGA packages. It also<\/span><span data-font-family=\"default\">\u00a0provides good oxidation resistance and solderability, but at a higher cost.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">OSP (Organic Solderability Preservative)<\/span><\/b><span data-font-family=\"default\">: <\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">The use of organic compounds to form a very thin layer of protective film on the surface of the PCB bare copper to protect the copper surface from oxidation. This process is environmentally friendly and cost-effective. However, the protective layer is thin and not suitable for multiple soldering or long-term storage.<\/span><\/p>\n<ul>\n<li><span data-font-family=\"default\"><strong>Immersion Silver\/Tin<\/strong>: <\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">Immersion silver<\/span><span data-font-family=\"default\"> and tin are the deposition of a silver or tin layer on the surface of copper through a chemical substitution reaction, respectively. Immersion silver process provides better flatness and solderability. Yet the silver layer is easily discolored by the effects of sulfides in the environment, while the immersion tin layer improves solderability but has tin whisker problems and a shorter shelf life.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">Electroless Nickel, Electroless Palladium, Immersion Gold (ENEPIG)<\/span><\/b><span data-font-family=\"default\">: <\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><span data-font-family=\"default\">This process adds a layer of palladium to ENIG, which further prevents oxidization problems of the nickel layer, provides better soldering performance and long-term reliability, and is particularly suitable for more demanding high-end applications. However, ENEPIG is also relatively costly.<\/span><\/p>\n<div class=\"document\">\n<div class=\"section\">\n<figure style=\"width: 402px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"025553b9\" class=\"\" src=\"https:\/\/wdcdn.qpic.cn\/MTY4ODg1ODI1ODYxNzU1NA_564586_6s9sd5IamUkixezN_1743417452?imageView2\/format\/jpg&amp;w=800&amp;h=450&amp;type=image\/webp\" alt=\"Physical picture of PCB using ENEPIG as surface treatment\" width=\"402\" height=\"226\" \/><figcaption class=\"wp-caption-text\">Physical picture of PCB using ENEPIG as surface treatment (Image source: online)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<p><span data-font-family=\"default\">Surface treatment is far more than a \u201cfinal touch\u201d in PCB manufacturing. It\u2019s a critical determinant of a board\u2019s performance, longevity, and compatibility with assembly processes. From cost-effective HASL to high-reliability ENEPIG, each technique addresses specific needs in the ever-evolving electronics landscape. As devices shrink and speeds increase, innovations in materials and processes will continue to redefine the boundaries of what\u2019s possible. It is to be sure that PCBs remain at the heart of technological progress.<\/span><\/p>\n<p><strong><em>Some images are sourced online. Please contact us for removal if any copyright concerns arise.<\/em><\/strong><\/p>\n<hr \/>\n<p><a href=\"https:\/\/www.lcsc.com\/customcables?utm_source=customcables&amp;utm_medium=navbar\">Custom Cables<\/a>: Save 50%+ Avg Cost By JST, Molex, TE Alternatives | Processing Fee Down to $1 Per Piece | No Minimum Order Quantity (MOQ) Required<\/p>\n<p><a href=\"https:\/\/www.lcsc.com\/pcba\">PCB &amp; PCBA<\/a>: New Customer Get Coupons Up to $125 | 1 &#8211; 32 Layers From $2 \/5pcs | PCB Assembly From $8 \/5pcs<\/p>\n<p><a href=\"https:\/\/www.lcsc.com\/front-panel\">Front Panels<\/a>: High-quality Front Panel Acrylic\/PET | Front Panel Order Up to 30% Off | Membrane Switch Available Soon<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Printed Circuit Boards (PCBs) are the backbone of modern electronics, enabling electrical connections between components. However, the exposed copper traces on a PCB\u2019s surface are vulnerable to oxidation, corrosion, and mechanical wear, which can degrade performance over time. Surface treatment process addresses these challenges by coating the copper with protective layers while ensuring reliable solderability. [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2371,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"iawp_total_views":2,"footnotes":""},"categories":[182],"tags":[181,155],"class_list":["post-2111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-smt-glossary","tag-pcb","tag-pcba"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Surface Treatment Process in PCB: Protection and Functionality<\/title>\n<meta name=\"description\" content=\"Explore key PCB surface treatment process and learn how they protect circuit boards while enhancing solderability and electrical performance.\" \/>\n<meta name=\"robots\" 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