目的purpose:

控制产品三防漆涂覆均匀、一致性，达到客户膜厚要求范围，确保产品品质。Tocontroluniformityofcoating,meetcustomerrequirementsofthethicknessofcoating,ensurethequalityoftheproducts.

2.范围scope:

本公司使用的自动涂覆工艺。Automaticcoatingprocessinourcompany.3.职责Responsibilities

3.1工程部：技术要求及各项参数的制定；EngineeringDepartment:settingtechnicalrequirementsandparameters;

3.2生产部：按涂覆作业文件作业；Productiondepartment:operatingaccordingtoSOP3.3品质部：对三防漆涂覆层厚度进行抽检；Qualitydepartment:Checkingthicknessofcoating

４.定义：Definition

４.1三防漆（Conformalcoating）：是一种特殊配方的涂料，用于保护线路板及其相关设备免受环境的侵蚀，从而提高并延长它们的使用寿命，确保使用的安全性和可靠性。Conformalcoatingisaspecialingredientofcoating,usedforprotectionofcircuitboardandrelatedequipmentagainstbeingeroded,soastoimproveandprolongtheirservicelife,ensuringthesafetyandreliability.

４.２磁性测厚法：当测头与覆层接触时，测头与磁性金属基体构成一闭合磁路，由于非磁性覆层的存在，使磁路磁阻发生变化，通过测量其变化量，可测得其覆层的厚度；Magnetic

measuringthicknessmethod:whentheprobecontactthecoating,sensorsandmagneticmetalformaclosedmagneticcircuit,duetothenonmagneticcoatings,themagneticcircuitreluctancetochange,bymeasuringthevariationcanbemeasuredthethicknessofcoating;

４.３涡流测厚法：利用高频交变电流线圈中产生一磁场，当测头与金属接触时，金属基体

上会产生涡流，并对测头具有反馈作用，通过其反馈作用的大小可测出覆层厚度；Eddy

currentmeasuringthicknessmethod:usinghighfrequencyalternatingcurrentproducesamagneticfieldinthecoil,whentheprobeincontactwithmetal,metalwillproduceeddycurrent,andhasafeedbackeffectonthemeasuringhead,throughthefeedbackeffectcanbemeasuredthesizeofthethicknessofcoating

5.内容Content

5.1测试板准备：Preparingtestboard:

5.1.1将标准的测铁板或铝板表面清洁干净，不能有任何杂物；Cleaningthesurfacesteel

oraluminumboard,therecanbenorubbish;

5.1.２对清洁好的测试板进行烘烤，去掉水份；Bakingthetestplatecleanedforremovingthewater;

5.1.３测试板上不能有凹凸不平现象，如有更换测试板。Thetestboardcannotbeuneven,Replacingthetestingboard,Iftheboarduneven.

5.２测试仪的校准（我司采用的是磁性、涡流综合测试仪）：calibratingthegauge(Itisusedthemagnetic,eddycurrentgaugeinourcompany)

5.２.1打开涂层测厚仪（ＧＴ8102）“ＯＮ”键，自动恢复上次关机前的参数设置，仪器自动进入待测试状态；PresstheONkeytoswitchonthegauge.Thegaugewillrestorethestateoflastoperationitself.

5.２.2在待测状态下将探头垂直压在待测铝板或铁板上，屏幕上会显示《*.**um》,然后按下“zero”键进行零位校准；在校准过程中探头一直压在基体上，直到屏幕显不（０cal）后才能提起探头。Placetheprobeonthesubstrateoranuncoatedstandardsteadily.thescreenwilldisplay"*.**um",PresstheZEROkeyand“0CAL”willbeonthedisplybeforeliftingtheprobe.

5.２.３重得校准２－３次后可以开始测试状态。Calibrating2-3timesbeforethebeginningoftest.5.3喷涂Spray

5.３.1自动喷涂机调入对应生产机型的参数文档Openthecorrespondingproductionmodelprogramrestoreditself

5.３.２将测试铝板或铁板放入自动喷涂机中进行喷涂，喷涂时查看其喷涂是否均匀（透过紫光灯检查）；Puttheboardofaluminumorsteelintotheautomaticspraying,checkingthecoatingisuniform(checkingbyultravioletlamp);

5.３.３检查好后过烘烤炉进行固化。Roastbyovenaftercheckingup.5.４膜厚测试：thicknesstest:

5.４.1测试铝板或铁板表面三防漆固化后用校准后的膜厚测试仪测试，其膜厚是否达到公司规定标准，如客户有要求标准厚度，按客户要求执行。Measuringthethicknessofcoating.Ifcustomeroffersstandardthickness,executionaccordingtocustomerrequirements.5.４.２如检查厚度符合要求后方可批量喷涂，如低于其厚度要求则要按5.3.1-5.3.3重复，直至达到要求范围后方可大量喷涂；Checkingthethicknessbeforethemassmanufacture,Ifthethicknessislessthanrequirements,repeat5.3.1-5.3.3untilitreachestherequirement

5.４.３批量喷涂的产品ＩＰＱＣ要对其进行膜厚抽测，每个机型１次，测厚度要记录于《喷涂膜厚测试记录》表内。IPQCshouldinspectrandomonetimeforeverybatch.Makearecordinthe"ThicknessofCoatingRecord".

5.４.４设定好的喷涂参数未有工程人员不能私自调动，调整后需重新进行膜厚测试。No

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测试探头

按键区

5.5膜厚工艺要求：thethicknessrequirements

丙烯酸类Acrylic（AR）：0.025-0.075mm[0.98-2.95mil]

环氧树脂类Epoxyresin（ER）：0.025-0.075mm[0.98-2.95mil]

聚氨脂类Polyurethane（UR）：0.025-0.075mm[0.98-2.95mil]

有机硅胶类Siliconerubber（SR）：0.025-0.2mm[0.98-7.87mil]

如客户有特殊要求按客户要求执行。Ifcustomershavespecialrequirements,executeaccordingtocustomerrequirements.

5.6注意事项：notes:

5.6.1我司膜厚测试仪只能用铝、铁材质；thethicknessgaugecanonlyuseforaluminium,ironmaterial;

5.6.2测试前必须要进行校准；Mustbecalibratedbeforeuse;

5.6.3通常仪器的每次读数不完全相同，因些在每一个测试面积内要取5个读数，对应的值求平均值。Everyvaluemeasuredusuallyisnotexactlythesame,soget5valueatthesamearea.Calculatetheaveragesofthevalues.

5.6.4测试铝板、铁板要求表面平整、干燥。Theboardofaluminiumandironmustbesmoothanddry.

5.6.5测试仪出现较大误差时可以恢复出厂设置再重新校准：

同时按住“ＯＮ”和“Ｆ/ＮＦ”键，先放开“ＯＮ”键，间隔１秒钟后再放开“Ｆ/ＮＦ”键，屏幕一稳定直显示“8888”时，再按“ＯＮ”恢复出厂设置成功。restorefactorysettings:

Atthesametime,pressthe"ON"and"F/NF"button,openupthe"ON"key,atintervalsof1secondsafterthereleaseof"F/NF"key,thescreenshowsasteadystraight"8888",thenclick"ON"torestorethefactorysettings.