1. Mainstream Salt Spray Test Standards for Stainless Steel Fasteners
1.1 ISO 9227: Global Universal Standard
1.2 ASTM B117: American Industrial Standard
1.3 GB/T 10125-2021: Chinese National Standard
2. Core Test Parameters of Conventional Stainless Steel Fasteners
Salt solution: 5% sodium chloride (NaCl) pure water solution, no impurity additives
Test temperature: Constant temperature 35℃, stable temperature control error ≤±1℃
Solution pH value: Maintain 6.5–7.2, neutral environment simulation
Salt spray settlement rate: 1–2 mL/(80cm²·h), ensuring uniform atomization
Conventional test duration: 24h / 48h / 96h / 120h, customized according to stainless steel grades and application scenarios
3. Standard Salt Spray Test Procedure for Stainless Steel Screws
3.1 Sample Preprocessing
3.2 Sample Placement
3.3 Constant Test Operation
3.4 Post-test Observation and Recording
4. Qualification Judgment Standard for Test Results
Qualified Standard: After completing the specified salt spray test cycle, the fastener surface remains intact without white rust, red rust, pitting corrosion or passive film cracking, and no damage occurs to the metal base material.
Unqualified Standard: The sample surface shows visible red rust spots, pitting corrosion, local passive film failure or large-area oxidation corrosion, indicating that the product fails to meet the standard anti-corrosion requirements.
5. Why Standardized Salt Spray Test Matters?
Summary
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304 stainless steel fasteners adopt 48–96 hours of standard testing; while high-grade 316/316L marine stainless steel fasteners require a test cycle of 120 hours or more to adapt to extreme corrosive conditions in coastal and marine environments."}}},"align":"left"}},"NTozfogi3dEz0acCTUJc6ougnwd":{"id":"NTozfogi3dEz0acCTUJc6ougnwd","snapshot":{"type":"heading2","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+1s"},"text":{"0":"3. Standard Salt Spray Test Procedure for Stainless Steel Screws"}}},"align":"left"}},"PcYCf2J7ndv2xocd7ovcUjX9nHf":{"id":"PcYCf2J7ndv2xocd7ovcUjX9nHf","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+8s"},"text":{"0":"Standardized operating procedures are the premise of valid and repeatable salt spray test results. Non-standard operation may lead to data deviation and misjudgment of product anti-corrosion performance. Below is the standardized full-process test procedure for stainless steel screw and fastener salt spray testing."}}},"align":"left"}},"BbZJfkBCrdBlQ9cR1hpcErWPnnd":{"id":"BbZJfkBCrdBlQ9cR1hpcErWPnnd","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+1b"},"text":{"0":"[Image 4: Salt Spray Test Operation Flow Chart]"}}},"align":"left"}},"VIUzfva3Sd2wi3cegXVcuKMOnHg":{"id":"VIUzfva3Sd2wi3cegXVcuKMOnHg","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+c*0*1+5r"},"text":{"0":"Image Prompt: Real shot of laboratory salt spray test process, placing stainless steel screw samples, closing test chamber, equipment operation display, real industrial scene, high definition, realistic light and shadow"}}},"align":"left"}},"InlbfbpEgdDe3lcmTdjc7tuJnMf":{"id":"InlbfbpEgdDe3lcmTdjc7tuJnMf","snapshot":{"type":"heading3","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+o"},"text":{"0":"3.1 Sample Preprocessing"}}},"align":"left"}},"ELGlfzRy1dbvcwc3aMdcWMWknUg":{"id":"ELGlfzRy1dbvcwc3aMdcWMWknUg","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+8i"},"text":{"0":"Select qualified finished stainless steel fastener samples, remove surface oil stains, dust and residual impurities using pure water and alcohol. Avoid scratching or damaging the surface passive film during cleaning. Place the treated samples in a dry, dust-free environment for natural drying and standby."}}},"align":"left"}},"SHK2fvtcWdxSLKcw09ccGOltnNd":{"id":"SHK2fvtcWdxSLKcw09ccGOltnNd","snapshot":{"type":"heading3","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+k"},"text":{"0":"3.2 Sample Placement"}}},"align":"left"}},"Htgif1D9Td3zbmcGt3QcCJ6Once":{"id":"Htgif1D9Td3zbmcGt3QcCJ6Once","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+8v"},"text":{"0":"Place the dried fastener samples inside the salt spray test chamber in accordance with standard requirements. Ensure no contact between samples or between samples and the chamber inner wall, so that the atomized salt spray can evenly cover the entire surface of each sample to form a uniform corrosive test environment."}}},"align":"left"}},"JH66foGEyd3lCrc5uYsciUEDnA9":{"id":"JH66foGEyd3lCrc5uYsciUEDnA9","snapshot":{"type":"heading3","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+r"},"text":{"0":"3.3 Constant Test Operation"}}},"align":"left"}},"G8dHfflJcdPPWzcD9okc8NiRnNb":{"id":"G8dHfflJcdPPWzcD9okc8NiRnNb","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+9q"},"text":{"0":"Debug the test equipment to stabilize the saline solution concentration, chamber temperature and spray settlement rate within the standard range, then start continuous timing and atomization. Frequent opening of the chamber door is prohibited during the test to prevent fluctuations in internal temperature and humidity that may affect test accuracy."}}},"align":"left"}},"NZ6VfNb29d4oNjc0UTTcKqztn7e":{"id":"NZ6VfNb29d4oNjc0UTTcKqztn7e","snapshot":{"type":"heading3","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+13"},"text":{"0":"3.4 Post-test Observation and Recording"}}},"align":"left"}},"GX1tfEJ1jdlOsWcVauCcfIFqnXe":{"id":"GX1tfEJ1jdlOsWcVauCcfIFqnXe","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+80"},"text":{"0":"Once the preset test duration is completed, take out the samples, clean the surface gently with pure water and dry them naturally. Inspect and record surface conditions including rust spots, pitting corrosion, passive film damage and oxidation defects for subsequent performance judgment."}}},"align":"left"}},"UwOsfAJ3YdTGr0cocU3cMJMqnRh":{"id":"UwOsfAJ3YdTGr0cocU3cMJMqnRh","snapshot":{"type":"heading2","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+1f"},"text":{"0":"4. Qualification Judgment Standard for Test Results"}}},"align":"left"}},"JfFhfE8kBdqSn4cUFLYcpThfncd":{"id":"JfFhfE8kBdqSn4cUFLYcpThfncd","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+7h"},"text":{"0":"The core evaluation criterion for stainless steel fastener salt spray tests is the integrity of the surface passive film and metal matrix after corrosion exposure. Combined with global industry standards, the unified qualification judgment rules are defined as follows:"}}},"align":"left"}},"AXHQfiv0AdMVSPcra2hc7czInxe":{"id":"AXHQfiv0AdMVSPcra2hc7czInxe","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+16"},"text":{"0":"[Image 5: Result Comparison Display Image]"}}},"align":"left"}},"JnlUfyg5VdUXBKc3qZpcB7gnngf":{"id":"JnlUfyg5VdUXBKc3qZpcB7gnngf","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+c*0*1+6j"},"text":{"0":"Image Prompt: Comparison chart of qualified and unqualified stainless steel screw salt spray test results, left side: intact non-rusting sample, right side: corroded and pitted sample, clear contrast, laboratory white background, intuitive display"}}},"align":"left"}},"PsWifAjlmdosXAcEr60cBcItn2f":{"id":"PsWifAjlmdosXAcEr60cBcItn2f","snapshot":{"type":"bullet","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","ai_extra":{"rewrite_command":1},"children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+i*0*1+5y"},"text":{"0":"Qualified Standard: After completing the specified salt spray test cycle, the fastener surface remains intact without white rust, red rust, pitting corrosion or passive film cracking, and no damage occurs to the metal base material."}}},"align":"left"}},"IoerfNLvldSt1tcn0Usc3I7onYe":{"id":"IoerfNLvldSt1tcn0Usc3I7onYe","snapshot":{"type":"bullet","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","ai_extra":{"rewrite_command":1},"children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+k*0*1+5z"},"text":{"0":"Unqualified Standard: The sample surface shows visible red rust spots, pitting corrosion, local passive film failure or large-area oxidation corrosion, indicating that the product fails to meet the standard anti-corrosion requirements."}}},"align":"left"}},"Mh0YfaNJxdMXCwcTlFac4Ja2ntc":{"id":"Mh0YfaNJxdMXCwcTlFac4Ja2ntc","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+8o"},"text":{"0":"For high-end application scenarios such as marine engineering equipment, new energy facilities and outdoor precision machinery, additional evaluation indicators including corrosion area ratio and corrosion grade will be adopted to verify the long-term anti-corrosion stability of fasteners in harsh environments."}}},"align":"left"}},"OKuZffPLzdeteMcTlYwcqBHUn7b":{"id":"OKuZffPLzdeteMcTlYwcqBHUn7b","snapshot":{"type":"heading2","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+18"},"text":{"0":"5. Why Standardized Salt Spray Test Matters?"}}},"align":"left"}},"K8ydfoug1dCTZ9cCR39clL1TnA6":{"id":"K8ydfoug1dCTZ9cCR39clL1TnA6","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+fd"},"text":{"0":"Stainless steel fasteners undertake critical connection and fixing functions in various equipment and engineering projects. Corrosion failure of fasteners will directly cause equipment loosening, structural instability and even potential safety hazards. Standardized salt spray testing is an essential quality control procedure to eliminate defective products with unqualified passive films and unstable anti-corrosion performance, ensuring the long-term reliable operation of end products in high-humidity, high-salt and coastal corrosive environments."}}},"align":"left"}},"LhWMfRwTDd1kdicEZiac2pB6nKe":{"id":"LhWMfRwTDd1kdicEZiac2pB6nKe","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["ai-extra","{\"is_ai_gen\":true,\"rewrite_command\":1}"],"1":["author","7592307086109756363"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1+9o"},"text":{"0":"All stainless steel screws, bolts, nuts and customized special fasteners we supply are strictly tested in accordance with ISO 9227, ASTM B117 and GB/T 10125-2021 standards. Complete official test reports and third-party authoritative certification are available to fully meet global customer quality audit and international market access standards."}}},"align":"left"}},"KCoMfIeiodGvS3cS8jmchRL9nEb":{"id":"KCoMfIeiodGvS3cS8jmchRL9nEb","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+17"},"text":{"0":"[Image 6: Enterprise Strength Ending Image]"}}},"align":"left"}},"Re8ZfCru8dMOhgcbDKVcKYvHn0b":{"id":"Re8ZfCru8dMOhgcbDKVcKYvHn0b","snapshot":{"type":"text","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"nextNum":3,"numToAttrib":{"0":["author","7592307086109756363"],"1":["ai-extra","{\"is_ai_gen\":true}"],"2":["bold","true"]}},"initialAttributedTexts":{"attribs":{"0":"*0*1*2+c*0*1+73"},"text":{"0":"Image Prompt: Neatly stacked finished stainless steel fastener products + laboratory test equipment background, high-end industrial texture, clean and tidy, highlighting product quality and professional testing capability, suitable for official website ending display"}}},"align":"left"}},"BqeTfZuisddQj9cBK09c3D9Knqb":{"id":"BqeTfZuisddQj9cBK09c3D9Knqb","snapshot":{"type":"heading2","parent_id":"XFfFdcjHyoKSfTx4y0UcqaAmnLc","comments":[],"revisions":[],"locked":false,"hidden":false,"author":"7592307086109756363","children":[],"text":{"apool":{"