In the present study, six organic solvents that are commonly used in the paint industry (1-butanol, 1-methoxy-2-propanol, 2-propanol, butyl acetate, propylene glycol monomethyl ether acetate, and diethylene glycol monobutyl ether) were tested for their ability to dissolve two distinct lignins: an industrial kraft lignin (KL) and a pilot-scale organosolv lignin (OL). Among the solvents investigated, 1-methoxy-2 propanol (Dowanol™ PM, DPM) and diethylene glycol monobutyl ether (Butyl Carbitol™, BC) demonstrated high degrees of solubility (> 98 wt. % at 25 °C) that were comparable to the commonly used lignin solvent, dimethyl sulfoxide (DMSO). Lignin coatings were prepared by spray-coating the new lignin-solvent solutions on iron-phosphated steel, prior to investigation of their subsequent morphological and electrochemical performance characteristics. It was found that KL/DPM coatings demonstrate suitable short-term (1 h, 5% NaCl) anticorrosive characteristics with an increased charge transfer resistance (R_ct) compared to the bare steel (1.5 × 10⁵ Ω. cm² cf. 1.9 × 10³ Ω. cm²). However, a prolonged (24 h) immersion resulted in a decrease in R_ct values (1.1 × 10⁴ Ω. cm²), which may indicate that the lignin coating alone is unable to provide long-term protection under these aggressive conditions.

在本研究中，测试了六种在涂料工业中常用的有机溶剂（1-丁醇，1-甲氧基-2-丙醇，2-丙醇，乙酸丁酯，丙二醇单甲醚乙酸酯和二甘醇单丁醚）具有溶解两种不同木质素的能力：工业牛皮纸木质素（KL）和中试规模的有机溶剂木质素（OL）。在所研究的溶剂中，1-甲氧基-2丙醇（Dowanol™PM，DPM）和二甘醇单丁醚（Butyl Carbitol™，BC）具有很高的溶解度（在25°C下> 98 wt。％），与常用的木质素溶剂二甲基亚砜（DMSO）。木质素涂料是通过将新的木质素溶剂溶液喷涂在磷酸铁上制成的，在研究其随后的形态和电化学性能特征之前。发现KL / DPM涂层具有合适的短期（1 h，5％NaCl）防腐性能，并具有增加的电荷转移阻力（R_CT）相比于裸钢（1.5×10 ⁵ Ω。厘米² 比照1.9×10 ³ Ω。厘米²）。然而，延长（24小时）浸入导致中的R的降低_CT值（1.1×10 ⁴ Ω。厘米²），其可指示木质素单独涂覆不能提供这些侵蚀性的条件下的长期保护。