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Alseal HX is a coating composition formulated for protecting ferrous alloys from both high temperature heat oxidation and at the same time offer sacrificial (cathodic) protection to the base metal. HX was formulated especially for application to headers, providing a smooth finish that may be burnished to a mirror shine. Because of its high temperature capabilities, it offers excellent protection when exposed to cyclic high temperature and corrosive salt environments, continuing to provide sacrificial properties at temperatures to 1150F. Although a ceramic coating, it combines thermal stability, excellent adhesion and hardness, along with good flexibility... a property not found in most ceramic coatings. As mentioned above it offers salt corrosive protection to 1150°F. At about 1200°F. the aluminum oxidizes to a point where it no longer provides its excellent sacrificial properties, however, it will continue to offer excellent heat oxidation continuously to 1600°F. and in some cases, depending on metal substrate, has offered heat oxidation protection to 2200°F. Tests have been conducted using low carbon steel alloys. There was no loss of weight after several weeks continuous exposure at 1000°F. After exposure to 5% salt spray for 1000 hours, there was no evidence of corrosion. Further, the coating formed from Alseal HX composition offers superb thermal shock resistance. The coated metal will not crack, spall, or fail after shocking from 1100°F. to room temperature repeatedly. Surface Preparation Special care must be exercised in the preparation of the surface for all high quality, premium performance coatings. 1) Degreasing. All oil, grease and other organic deposits must be removed by suitable degreasing operation or by heating parts to temperature sufficiently high to facilitate removal. 2) Cleaning and Roughening. All old coats, mill scale, rust, or other tightly adherent deposits must be removed by a method such as dry grit blasting or vapor blasting. Grit blast, using clean aluminum oxide AL2 O3) grit, is the recommended cleaning procedure which is necessary for maximum adhesion to steel, although other abrasive methods may be satisfactory由于其耐高溫能力，它提供了出色的保護(hù)，當(dāng)暴露在循環(huán)高溫和腐蝕性鹽的環(huán)境中，繼續(xù)在溫度1150提供犧牲性能* F。盡管陶瓷涂層，它結(jié)合了熱穩(wěn)定性，優(yōu)異的附著力和硬度，以及良好的柔韌性......一個(gè)屬性不是在大多數(shù)陶瓷涂層找到。如上所述，它提供了鹽的腐蝕防護(hù)1150F。在約1200 F的鋁氧化成一個(gè)點(diǎn)，它不再提供其優(yōu)異犧牲性能，但是，它會(huì)繼續(xù)不斷地提供優(yōu)良的熱氧化1600 F ，在某些情況下，根據(jù)金屬基板，提供了熱氧化保護(hù)到2200F

從HX3200組合物形成的涂層提供了極好的抗熱震性。該涂層的金屬不會(huì)開(kāi)裂，剝落，或反復(fù)后令人震驚的失敗來(lái)自1100F到室溫。