鋅(xin)(xin)(xin)(xin)(xin)粉的(de)(de)含(han)量(liang)過高,富(fu)(fu)(fu)鋅(xin)(xin)(xin)(xin)(xin)底(di)漆的(de)(de)防腐蝕性(xing)能(neng)(neng)也未必就好(hao)。鋅(xin)(xin)(xin)(xin)(xin)粉含(han)量(liang)過高,自然富(fu)(fu)(fu)鋅(xin)(xin)(xin)(xin)(xin)底(di)漆中(zhong)的(de)(de)樹脂(zhi)含(han)量(liang)會降(jiang)低,成膜物減(jian)少(shao),漆膜與鋼材的(de)(de)附(fu)著(zhu)力因之而減(jian)小。因此,一(yi)旦水(shui)等滲(shen)透(tou)到(dao)鋅(xin)(xin)(xin)(xin)(xin)粉表(biao)(biao)面(mian),引(yin)起(qi)鋅(xin)(xin)(xin)(xin)(xin)腐蝕,體積增(zeng)大,從而使涂(tu)層(ceng)(ceng)起(qi)泡的(de)(de)可能(neng)(neng)性(xing)變大。集裝箱涂(tu)料有(you)耐(nai)鹽(yan)水(shui)性(xing)能(neng)(neng)和(he)耐(nai)鹽(yan)霧性(xing)能(neng)(neng)兩(liang)個防腐指標。有(you)試驗表(biao)(biao)明,富(fu)(fu)(fu)鋅(xin)(xin)(xin)(xin)(xin)底(di)漆中(zhong)的(de)(de)鋅(xin)(xin)(xin)(xin)(xin)含(han)量(liang)低,由于鋅(xin)(xin)(xin)(xin)(xin)粉顆粒之間(jian)不(bu)能(neng)(neng)形成完整的(de)(de)鋅(xin)(xin)(xin)(xin)(xin)粉層(ceng)(ceng),鋅(xin)(xin)(xin)(xin)(xin)的(de)(de)陰極(ji)保(bao)護作用不(bu)明顯,鹽(yan)霧試驗不(bu)久(jiu)就出(chu)現了紅銹(xiu),但其耐(nai)鹽(yan)水(shui)性(xing)能(neng)(neng)較好(hao)。隨(sui)富(fu)(fu)(fu)鋅(xin)(xin)(xin)(xin)(xin)底(di)漆中(zhong)鋅(xin)(xin)(xin)(xin)(xin)含(han)量(liang)的(de)(de)增(zeng)高,其陰極(ji)保(bao)護作用增(zeng)高。但如(ru)鋅(xin)(xin)(xin)(xin)(xin)含(han)量(liang)過高,由于樹脂(zhi)的(de)(de)減(jian)少(shao),基材與涂(tu)層(ceng)(ceng)的(de)(de)附(fu)著(zhu)力相對減(jian)少(shao),一(yi)旦鹽(yan)水(shui)溶液滲(shen)透(tou),引(yin)起(qi)鋅(xin)(xin)(xin)(xin)(xin)的(de)(de)腐蝕,導致(zhi)漆層(ceng)(ceng)起(qi)泡,因此其耐(nai)鹽(yan)水(shui)性(xing)能(neng)(neng)降(jiang)低。
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