缓蚀率测定方法
Corrosion inhibitorxeem txoj kev
Tus Qauv Zauv: Q / SHCG109-2017
Txuj: Q / SHCG109-2017
试剂与仪器:
Reagents thiab cov cuab yeej
盐酸:分析纯,用于配制腐蚀液(警示:盐酸对皮肤或纤维有灼伤腐蚀)
Hydrochloric acid: Kev ntsuas qib, siv los npaj cov kev daws teeb meem corrosive (Ceeb toom: Hydrochloric acid tuaj yeem ua rau kub hnyiab thiab xeb rau ntawm daim tawv nqaij lossis fibers)
石油醚: 60℃~ 90 degree, 分析纯 (警示: 石油醚易燃).
Petroleum ether: 60℃- 90 degree, analytical qib (Ceeb toom: Petroleum ether yog flammable)
无水乙醇:分析纯(警示:无水乙醇易燃).
Anhydrous ethanol: Qib ntsuas (Ceeb toom: Anhydrous ethanol yog flammable).
6亚甲基4胺(乌洛托品):配成质量分数为0.5%水溶液.
Hexamethylenetetramine (urotropine): Npaj 0.5% aqueous tov los ntawm pawg.
Tus Qauv Zauv: 符合GB/T6682中3级水的要求.
Dej: Ua raws li cov cai ntawm Qib III dej raws li tau teev tseg hauv GB / T6682.
缓蚀剂:待测样品.
Corrosion inhibitor: Qauv yuav tsum tau kuaj.
盐酸溶液:质量分数为10%(用于清洗挂片).
Hydrochloric acid tov: 10% los ntawm huab hwm coj (rau ntxuav cov hlau dai).
Loj: 35mm × 10mmX2mm × 20" 碳钢(符合GB/T699-2015).
Test daim specification: 20" carbon steel ntawm 35mm × 10mm × 2mm (raws li GB / T699-2015).
仪器和设备
Cov cuab yeej thiab cov cuab yeej siv
Lub kaum ntse ntse: 0.5℃.
Cov dej kub tsis tu ncua: Los yog cov cuab yeej ntsuas zoo sib xws, nrog kev tswj qhov kub thiab txias ntawm ± 0.5 degree.
注:测定温度时温度计应在检定有效期内.
Nco tseg: Thaum ntsuas qhov kub thiab txias, tus pas ntsuas kub yuav tsum nyob rau hauv lub sijhawm siv tau ntawm kev kuaj xyuas.
Cov txiaj ntsig: 0.1mg.
Electronic tshuav nyiaj li cas: Yam tsawg kawg nkaus faib tus nqi 0.1mg.
试验容器:烧杯或其他
Test thawv: beaker los yog lwm yam
实验步骤:
Cov txheej txheem kuaj:
试片的准备:对购置到的试片进行检查,试片应有编号,选择表面光滑无毛刺的试片.
Kev npaj cov khoom xeem: Tshawb xyuas cov khoom xeem yuav khoom. Lawv yuav tsum tau suav thiab xaiv cov uas muaj qhov chaw du thiab tsis muaj burrs.
试片的预清洗: 先用石油醚浸泡擦拭, 后用无水乙醇清洗, 吸干, 置于干燥器中24h 备用.测定前称量, 准确至0.1mg, 不应用手直接接触钢片表面.
Ua ntej- ntxuav ntawm daim ntawv xeem: Ua ntej, soak thiab so nrog roj av ether, ces ntxuav nws nrog anhydrous ethanol, nqus cov dej noo, thiab khaws cia rau hauv lub desiccator rau 24 teev rau yav tom ntej. Ntsuas qhov tseeb rau 0.1mg ua ntej ntsuas. Tsis txhob kov cov ntawv hlau ncaj qha nrog koj txhais tes.
Lub cev muaj zog: 20℃± 2℃条件下, 制备足量的1000mg / LHCl 水溶液
Kev npaj cov tshuaj tiv thaiv corrosion: Ntawm 20℃± 2 degree, npaj qhov txaus ntawm 1000mg / LHCl aqueous tov
缓蚀样品溶液的准备: 水溶性的缓蚀剂用蒸馏水稀释, 配制成50mL ~ 100 mL 质量分数为10% ntawm 缓蚀剂溶液.
Kev npaj cov tshuaj tiv thaiv corrosion inhibitor: Dilute cov dej -soluble corrosion inhibitor nrog dej distilled los npaj ib 50mL rau 100 mL corrosion inhibitor tov nrog ib feem ntawm 10%.
采用4个试验内器, 在4个实验 器中分别加入1000mg/LHCl水溶液做为腐蚀液, 其中2个试验内器用作空白腐蚀试验,在另2个实验了器中加入缓蚀剂，使腐蚀溶液中缓蚀剂，使腐蚀溶液中缓蚀剂。
Plaub lub thawv kuaj tau siv . 1000mg/LHCl aqueous tov tau ntxiv rau txhua qhov ntawm plaub lub thawv ntsuas raws li cov tshuaj tiv thaiv corrosion. Ob lub thawv kuaj tau siv rau kev kuaj corrosion dawb paug, thiab cov tshuaj tiv thaiv corrosion tau ntxiv rau lwm ob lub thawv ntsuas kom ua rau cov concentration ntawm corrosion inhibitors hauv cov tshuaj corrosion 100mg / L.
85℃± 2 degree时, 把准备好的装有腐蚀溶液 (1000mL)的试验入器放入水浴中, 每个试验内器中置入3片待测试片，试片悬挂的位置水平面角120℃分布, 试片在腐蚀液液面10mm下, 且距离试验内器壁的水平距离不小于 20mm, 开姶腵彽.
Thaum qhov kub thiab txias stabilizes ntawm 85℃± 2 degree, muab cov thawv kuaj npaj uas muaj cov tshuaj corrosive (1000mL) rau hauv dej da dej. Muab peb daim ntawv xeem rau hauv txhua lub thawv kuaj. Cov ntawv xeem yuav tsum tau muab tshem tawm ntawm lub dav hlau dej ntawm 120 degree. Cov ntawv xeem yuav tsum yog 10 hli hauv qab ntawm cov tshuaj corrosive thiab ntawm kab rov tav tsis pub tsawg tshaj 20 hli ntawm phab ntsa ntawm lub thawv kuaj. Pib sau lub sij hawm txiav txim corrosion
试验开始后,若因温升引起水浴中水分蒸发量较大时(影响实验),应补充适量同温直至实验6h后结束,取出试片观察其表面情况并记录.
Tom qab qhov kev sim pib, yog tias cov evaporation ntawm cov dej hauv da dej yog qhov loj heev vim qhov kub thiab txias ( cuam tshuam rau qhov kev sim), cov dej tsim nyog ntawm qhov kub thiab txias yuav tsum tau ntxiv kom txog rau thaum qhov kev sim ua tiav tom qab 6 teev. Cov ntawv xeem tau raug coj tawm los soj ntsuam qhov xwm txheej saum npoo thiab sau nws.
试片的处理: 试片上腐蚀沉积物用质量分数为1O% HICI溶液冲洗并再用脱脂棉蘸质量分数为0.5% 乌洛托品水溶液(A.3.4) 将试片擦洗干净, 并用水冲洗干净;
Kev kho ntawm daim ntawv xeem: Cov khoom pov tseg ntawm cov khoom kuaj yuav tsum tau muab yaug nrog 10% HICI cov tshuaj los ntawm pawg pawg, thiab tom qab ntawd cov khoom kuaj yuav tsum tau muab ntxuav nrog cov paj rwb swab dipped hauv 0.5% urotropine aqueous tov (A.3.4) los ntawm pawg pawg, thiab tom qab ntawd yaug nrog dej.
最后用无水乙醇清洗后用滤纸吸干, 置入干燥器 24h 后取出称量, 准确至 0.lmg.
Thaum kawg, ntxuav nrog anhydrous ethanol thiab qhuav nrog cov ntawv lim. Muab tso rau hauv lub tshuab desiccator rau 24 teev, tom qab ntawd muab nws tawm thiab ntsuas kom raug rau 0.1mg.
注1:整个测定过程应在通风橱内进行.
Lus Cim 1: Tag nrho cov txheej txheem ntsuas yuav tsum tau ua nyob rau hauv lub fume hood.
注2:在配制测定用腐蚀溶液的过程中应遵守国家对危险品的相关规定.
Lus Cim 2: Thaum lub sij hawm npaj cov kev daws teeb meem corrosive rau kev txiav txim siab, cov kev cai hauv lub tebchaws tseem ceeb ntawm cov khoom txaus ntshai yuav tsum tau ua raws.
挂片腐蚀试验应在相同条件下做平行试验,每个试验容器内挂置3个试片.
Kev ntsuam xyuas corrosion ntawm cov khoom dai yuav tsum tau ua nyob rau hauv tib lub sijhawm, nrog rau peb qhov kev xeem ntawv dai rau hauv txhua lub thawv ntsuas.
测定结果的计算
Kev suav cov ntsuas ntsuas
计算3个试片的平均腐蚀失重值
缓蚀率按下式计算:
n=(1-△Wx /△Wn)X100%
n-缓蚀率(%);
△Wx--加缓蚀剂条件下试片的腐蚀失重数值, 单位为克(g);
△Wn--空白条件下试片的腐蚀失重数值, 单位为克(g)
Xam qhov nruab nrab corrosion poob qhov tseem ceeb ntawm peb daim ntawv xeem
Tus nqi tiv thaiv corrosion yog xam los ntawm cov qauv hauv qab no:
n=(1-△Wx /△Wn)X100%
n - Corrosion inhibition tus nqi (%);
△Wx - Lub corrosion poob tus nqi ntawm cov khoom xeem nyob rau hauv cov xwm txheej ntawm ntxiv corrosion inhibitor, nrog rau chav tsev ntawm grams (g);
△Wn - Corrosion poob tus nqi ntawm daim ntawv xeem nyob rau hauv qhov chaw dawb paug, chav tsev: grams (g)